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19-3280; Rev 2; 8/04
KIT ATION EVALU LE B AVAILA
10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports
General Description
The MAX1020-MAX1023/MAX1057/MAX1058 integrate a multichannel, 10-bit, analog-to-digital converter (ADC) and an octal, 10-bit, digital-to-analog converter (DAC) in a single IC. These devices also include a temperature sensor and configurable general-purpose I/O ports (GPIOs) with a 25MHz SPITM-/QSPITM-/MICROWIRETM-compatible serial interface. The ADC is available in 8/12/16 inputchannel versions. The octal DAC outputs settle within 2.0s, and the ADC has a 300ksps conversion rate. All devices include an internal reference (2.5V or 4.096V) providing a well-regulated, low-noise reference for both the ADC and DAC. Programmable reference modes for the ADC and the DAC allow the use of an internal reference, an external reference, or a combination of both. Features such as an internal 1C accurate temperature sensor, FIFO, scan modes, programmable internal or external clock modes, data averaging, and AutoShutdownTM allow users to minimize both power consumption and processor requirements. The low glitch energy (4nV*s) and low digital feedthrough (0.5nV*s) of the integrated octal DACs make these devices ideal for digital control of fast-response closed-loop systems. The devices are guaranteed to operate with a supply voltage from +2.7V to +3.6V (MAX1021/MAX1023/MAX1057) and from +4.75V to +5.25V (MAX1020/MAX1022/ MAX1058). The devices consume 2.5mA at 300ksps throughput, only 22A at 1ksps throughput, and under 0.2A in the shutdown mode. The MAX1057/MAX1058 feature 12 GPIOs, while the MAX1020/MAX1021 offer 4 GPIOs that can be configured as inputs or outputs. The MAX1057/MAX1058 are available in 48-pin thin QFN packages. The MAX1020-MAX1023 are available in 36pin thin QFN packages. All devices are specified over the -40C to +85C temperature range.
Features
10-Bit, 300ksps ADC Analog Multiplexer with True-Differential Track/Hold (T/H) 16 Single-Ended Channels or 8 Differential Channels (Unipolar or Bipolar) 12 Single-Ended Channels or 6 Differential Channels (Unipolar or Bipolar) 8 Single-Ended Channels or 4 Differential Channels (Unipolar or Bipolar) Excellent Accuracy: 0.5 LSB INL, 0.5 LSB DNL 10-Bit, Octal, 2s Settling DAC Ultra-Low Glitch Energy (4nV*s) Power-Up Options from Zero Scale or Full Scale Excellent Accuracy: 1 LSB INL Internal Reference or External Single-Ended/ Differential Reference Internal Reference Voltage 2.5V or 4.096V Internal 1C Accurate Temperature Sensor On-Chip FIFO Capable of Storing 16 ADC Conversion Results and One Temperature Result On-Chip Channel-Scan Mode and Internal Data-Averaging Features Analog Single-Supply Operation +2.7V to +3.6V or +4.75V to +5.25V 25MHz, SPI/QSPI/MICROWIRE Serial Interface AutoShutdown Between Conversions Low-Power ADC 2.5mA at 300ksps 22A at 1ksps 0.2A at Shutdown Low-Power DAC: 1.5A Evaluation Kit Available (Order MAX1258EVKIT)
SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. AutoShutdown is a trademark of Maxim Integrated Products, Inc.
MAX1020-MAX1023/MAX1057/MAX1058
Applications
Controls for Optical Components Base-Station Control Loops System Supervision and Control Data-Acquisition Systems
Ordering Information/Selector Guide
REF ANALOG RESOLUTION ADC DAC VOLTAGE SUPPLY GPIOs BITS*** CHANNELS CHANNELS (V) VOLTAGE (V) 4.096 2.5 4.096 2.5 2.5 4.75 to 5.25 2.7 to 3.6 4.75 to 5.25 2.7 to 3.6 2.7 to 3.6 4.75 to 5.25 10 10 10 10 10 10 8 8 12 12 16 16 8 8 8 8 8 8 4 4 0 0 12 12
PART MAX1020BETX
TEMP RANGE
PIN-PACKAGE
-40C to +85C 36 Thin QFN-EP**
MAX1021BETX* -40C to +85C 36 Thin QFN-EP** MAX1022BETX* -40C to +85C 36 Thin QFN-EP** MAX1023BETX* -40C to +85C 36 Thin QFN-EP** MAX1057BETM -40C to +85C 48 Thin QFN-EP**
MAX1058BETM -40C to +85C 48 Thin QFN-EP** 4.096 *Future product--contact factory for availability. **EP = Exposed pad. ***Number of resolution bits refers to both DAC and ADC.
Pin Configurations appear at end of data sheet. 1
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports MAX1020-MAX1023/MAX1057/MAX1058
ABSOLUTE MAXIMUM RATINGS
AVDD to AGND .........................................................-0.3V to +6V DGND to AGND.....................................................-0.3V to +0.3V DVDD to AVDD .......................................................-3.0V to +0.3V Digital Inputs to DGND.............................................-0.3V to +6V Digital Outputs to DGND .........................-0.3V to (DVDD + 0.3V) Analog Inputs, Analog Outputs and REF_ to AGND...............................................-0.3V to (AVDD + 0.3V) Maximum Current into Any Pin (except AGND, DGND, AVDD, DVDD, and OUT_) ...........................................................50mA Maximum Current into OUT_.............................................100mA Continuous Power Dissipation (TA = +70C) 36-Pin Thin QFN (6mm x 6mm) (derate 26.3mW/C above +70C) ......................2105.3mW 48-Pin Thin QFN (7mm x 7mm) (derate 26.3mW/C above +70C) ......................2105.3mW Operating Temperature Range ...........................-40C to +85C Storage Temperature Range .............................-60C to +150C Junction Temperature ......................................................+150C Lead Temperature (soldering, 10s) .................................+300C
Note: If the package power dissipation is not exceeded, one output at a time may be shorted to AVDD, DVDD, AGND, or DGND indefinitely
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(AVDD = DVDD = 2.7V to 3.6V (MAX1021/MAX1023/MAX1057), external reference VREF = 2.5V (MAX1021/MAX1023/MAX1057), AVDD = DVDD = 4.75V to 5.25V (MAX1020/MAX1022/MAX1058), external reference VREF = 4.096V (MAX1020/MAX1022/MAX1058), fSCLK = 4.8MHz (50% duty cycle), TA = -40C to +85C, unless otherwise noted. Typical values are at AVDD = DVDD = 3V (MAX1021/MAX1023/MAX1057), AVDD = DVDD = 5V (MAX1020/MAX1022/MAX1058), TA = +25C. Outputs are unloaded, unless otherwise noted.)
PARAMETER DC ACCURACY (Note 1) Resolution Integral Nonlinearity Differential Nonlinearity Offset Error Gain Error Gain Temperature Coefficient Channel-to-Channel Offset (Note 2) INL DNL 10 0.5 0.5 0.25 0.025 1.4 0.1 1.0 1.0 2.0 2.0 Bits LSB LSB LSB LSB ppm/C LSB SYMBOL CONDITIONS ADC MIN TYP MAX UNITS
DYNAMIC SPECIFICATIONS (10kHz sine wave input, VIN = 2.5VP-P (MAX1021/MAX1023/MAX1057), VIN = 4.096VP-P (MAX1020/MAX1022/MAX1058), 300ksps, fSCLK = 4.8MHz) Signal-to-Noise Plus Distortion Total Harmonic Distortion (Up to the Fifth Harmonic) Spurious-Free Dynamic Range Intermodulation Distortion Full-Linear Bandwidth Full-Power Bandwidth CONVERSION RATE (Note 3) External reference Power-Up Time tPU Internal reference (Note 4) 0.8 218 s Conversion Clock Cycles SINAD THD SFDR IMD fin1 = 9.9kHz, fin2 = 10.2kHz SINAD > 70dB -3dB point 61 -70 66 72 100 1 dB dBc dBc dBc kHz MHz
2
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10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports
ELECTRICAL CHARACTERISTICS (continued)
(AVDD = DVDD = 2.7V to 3.6V (MAX1021/MAX1023/MAX1057), external reference VREF = 2.5V (MAX1021/MAX1023/MAX1057), AVDD = DVDD = 4.75V to 5.25V (MAX1020/MAX1022/MAX1058), external reference VREF = 4.096V (MAX1020/MAX1022/MAX1058), fSCLK = 4.8MHz (50% duty cycle), TA = -40C to +85C, unless otherwise noted. Typical values are at AVDD = DVDD = 3V (MAX1021/MAX1023/MAX1057), AVDD = DVDD = 5V (MAX1020/MAX1022/MAX1058), TA = +25C. Outputs are unloaded, unless otherwise noted.)
PARAMETER Acquisition Time Conversion Time Internal Clock Frequency External Clock Frequency Duty Cycle Aperture Delay Aperture Jitter ANALOG INPUTS Input Voltage Range (Note 6) Input Leakage Current Input Capacitance INTERNAL TEMPERATURE SENSOR Measurement Error (Notes 5, 7) Temperature Resolution INTERNAL REFERENCE REF1 Output Voltage (Note 8) REF1 Voltage Temperature Coefficient REF1 Output Impedance REF1 Short-Circuit Current EXTERNAL REFERENCE REF1 Input Voltage Range REF2 Input Voltage Range (Note 4) VREF1 REF mode 11 (Note 4) REF mode 01 REF mode 11 1 1 0 AVDD + 0.05 AVDD + 0.05 1 V VREF = 2.5V VREF = 4.096V TCREF MAX1021/MAX1023/MAX1057 MAX1020/MAX1022/MAX1058 2.482 4.066 2.50 4.096 30 6.5 0.39 0.63 2.518 4.126 V ppm/C k mA TA = +25C TA = TMIN to TMAX 0.7 1.0 1/8 3.0 C C/LSB Unipolar Bipolar 0 -VREF / 2 0.01 24 VREF VREF / 2 1 V A pF fCLK SYMBOL tACQ tCONV (Note 5) Internally clocked Externally clocked Internally clocked conversion Externally clocked conversion (Note 5) 0.1 40 30 <50 2.7 4.3 4.8 60 CONDITIONS MIN 0.6 3.5 TYP MAX UNITS s s MHz MHz % ns ps
MAX1020-MAX1023/MAX1057/MAX1058
VREF2
V
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3
10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports MAX1020-MAX1023/MAX1057/MAX1058
ELECTRICAL CHARACTERISTICS (continued)
(AVDD = DVDD = 2.7V to 3.6V (MAX1021/MAX1023/MAX1057), external reference VREF = 2.5V (MAX1021/MAX1023/MAX1057), AVDD = DVDD = 4.75V to 5.25V (MAX1020/MAX1022/MAX1058), external reference VREF = 4.096V (MAX1020/MAX1022/MAX1058), fSCLK = 4.8MHz (50% duty cycle), TA = -40C to +85C, unless otherwise noted. Typical values are at AVDD = DVDD = 3V (MAX1021/MAX1023/MAX1057), AVDD = DVDD = 5V (MAX1020/MAX1022/MAX1058), TA = +25C. Outputs are unloaded, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS VREF = 2.5V (MAX1021/MAX1023/MAX1057), fSAMPLE = 300ksps REF1 Input Current (Note 9) IREF1 VREF = 4.096V (MAX1020/MAX1022/MAX1058), fSAMPLE = 300ksps Acquisition between conversions VREF = 2.5V (MAX1021/MAX1023/MAX1057), fSAMPLE = 300ksps REF2 Input Current IREF2 VREF = 4.096V (MAX1020/MAX1022/MAX1058), fSAMPLE = 300ksps Acquisition between conversions DAC DC ACCURACY (Note 10) Resolution Integral Nonlinearity Differential Nonlinearity Offset Error Offset-Error Drift Gain Error Gain Temperature Coefficient DAC OUTPUT No load Output-Voltage Range 10k load to either rail DC Output Impedance Capacitive Load (Note 11) AVDD = 2.7V, VREF = 2.5V (MAX1021/MAX1023/MAX1057), gain error < 1% Resistive Load to AGND RL AVDD = 4.75V, VREF = 4.096V (MAX1020/MAX1022/MAX1058), gain error < 2% 500 2000 0.1 0.5 1 AVDD 0.1 nF 0.02 AVDD 0.02 V GE (Note 8) INL DNL VOS Guaranteed monotonic (Note 8) 3 10 1.25 8 10 10 0.5 1 0.5 10 Bits LSB LSB mV ppm of FS/C LSB ppm of FS/C MIN TYP 25 MAX 80 A 40 0.01 25 80 1 80 A 40 0.01 80 1 UNITS
4
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10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports
ELECTRICAL CHARACTERISTICS (continued)
(AVDD = DVDD = 2.7V to 3.6V (MAX1021/MAX1023/MAX1057), external reference VREF = 2.5V (MAX1021/MAX1023/MAX1057), AVDD = DVDD = 4.75V to 5.25V (MAX1020/MAX1022/MAX1058), external reference VREF = 4.096V (MAX1020/MAX1022/MAX1058), fSCLK = 4.8MHz (50% duty cycle), TA = -40C to +85C, unless otherwise noted. Typical values are at AVDD = DVDD = 3V (MAX1021/MAX1023/MAX1057), AVDD = DVDD = 5V (MAX1020/MAX1022/MAX1058), TA = +25C. Outputs are unloaded, unless otherwise noted.)
PARAMETER Wake-Up Time (Note 12) 1k Output Termination 100k Output Termination DYNAMIC PERFORMANCE (Notes 5, 13) Output-Voltage Slew Rate Output-Voltage Settling Time Digital Feedthrough Major Code Transition Glitch Impulse Output Noise (0.1Hz to 50MHz) Output Noise (0.1Hz to 500kHz) DAC-to-DAC Transition Crosstalk INTERNAL REFERENCE REF1 Output Voltage (Note 8) REF1 Temperature Coefficient REF1 Short-Circuit Current EXTERNAL-REFERENCE INPUT REF1 Input Voltage Range REF1 Input Impedance VREF1 RREF1 DIGITAL INTERFACE DIGITAL INPUTS (SCLK, DIN, CS, CNVST, LDAC) Input-Voltage High Input-Voltage Low Input Leakage Current Input Capacitance DIGITAL OUTPUT (DOUT) (Note 14) Output-Voltage Low VOL ISINK = 2mA 0.4 V VIH VIL IL CIN DVDD = 2.7V to 5.25V DVDD = 3.6V to 5.25V DVDD = 2.7V to 3.6V 0.01 15 2.4 0.8 0.6 10 V V A pF REF modes 01, 10, and 11 (Note 4) 0.7 70 100 AVDD 130 V k TCREF VREF = 2.5V VREF = 4.096V MAX1021/MAX1023/MAX1057 MAX1020/MAX1022/MAX1058 2.482 4.066 2.50 4.096 30 0.39 0.63 2.518 4.126 V ppm/C mA SR tS Positive and negative To 1 LSB, 400 - C00 hex (Note 7) Code 0, all digital inputs from 0 to DVDD Between codes 2047 and 2048 From VREF Using internal reference From VREF Using internal reference 3 2 0.5 4 660 720 260 320 0.5 5 V/s s nV*s nV*s VP-P VP-P nV*s SYMBOL CONDITIONS From power-down mode, AVDD = 5V From power-down mode, AVDD = 2.7V Programmed in power-down mode At wake-up or programmed in power-down mode MIN TYP 25 21 1 100 MAX UNITS s k k
MAX1020-MAX1023/MAX1057/MAX1058
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5
10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports MAX1020-MAX1023/MAX1057/MAX1058
ELECTRICAL CHARACTERISTICS (continued)
(AVDD = DVDD = 2.7V to 3.6V (MAX1021/MAX1023/MAX1057), external reference VREF = 2.5V (MAX1021/MAX1023/MAX1057), AVDD = DVDD = 4.75V to 5.25V (MAX1020/MAX1022/MAX1058), external reference VREF = 4.096V (MAX1020/MAX1022/MAX1058), fSCLK = 4.8MHz (50% duty cycle), TA = -40C to +85C, unless otherwise noted. Typical values are at AVDD = DVDD = 3V (MAX1021/MAX1023/MAX1057), AVDD = DVDD = 5V (MAX1020/MAX1022/MAX1058), TA = +25C. Outputs are unloaded, unless otherwise noted.)
PARAMETER Output-Voltage High Tri-State Leakage Current Tri-State Output Capacitance DIGITAL OUTPUT (EOC) (Note 14) Output-Voltage Low Output-Voltage High Tri-State Leakage Current Tri-State Output Capacitance GPIOB_, GPIOC_ OutputVoltage Low GPIOB_, GPIOC_ OutputVoltage High GPIOA_ Output-Voltage Low GPIOA_ Output-Voltage High Tri-State Leakage Current Tri-State Output Capacitance Digital Positive-Supply Voltage Digital Positive-Supply Current Analog Positive-Supply Voltage COUT DVDD DIDD AVDD Idle, all blocks shut down Only ADC on, external reference MAX1021/MAX1023/MAX1057 MAX1020/MAX1022/MAX1058 Idle, all blocks shut down Analog Positive Supply Current AIDD Only ADC on, external reference fSAMPLE = 300ksps fSAMPLE = 100ksps 2.7 4.75 0.2 2.8 2.6 1.5 -77 dB AVDD = 4.75V MAX1020/MAX1022/MAX1058 MAX1021/MAX1023/MAX1057 Output AVDD = 2.7V to 3.6V code = FFFhex MAX1020/MAX1022/MAX1058 AVDD = 4.75V to 5.25V -80 0.1 0.1 0.5 mV 0.5 4.0 2.70 0.2 1 3.6 5.25 1 4.2 mA 15 AVDD 4 POWER REQUIREMENTS (Note 15) V A mA V A COUT ISINK = 2mA ISINK = 4mA ISOURCE = 2mA ISINK = 15mA ISOURCE = 15mA DVDD 0.8 10 DVDD 0.5 0.8 15 0.4 0.8 DIGITAL OUTPUTS (GPIO_) (Note 14) V V V V A pF VOL VOH ISINK = 2mA ISOURCE = 2mA DVDD 0.5 10 0.4 V V A pF COUT 15 SYMBOL VOH CONDITIONS ISOURCE = 2mA MIN DVDD 0.5 10 TYP MAX UNITS V A pF
All DACs on, no load, internal reference AVDD = 2.7V MAX1021/MAX1023/MAX1057 REF1 Positive-Supply Rejection PSRR
DAC Positive-Supply Rejection
PSRD
6
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10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports
ELECTRICAL CHARACTERISTICS (continued)
(AVDD = DVDD = 2.7V to 3.6V (MAX1021/MAX1023/MAX1057), external reference VREF = 2.5V (MAX1021/MAX1023/MAX1057), AVDD = DVDD = 4.75V to 5.25V (MAX1020/MAX1022/MAX1058), external reference VREF = 4.096V (MAX1020/MAX1022/MAX1058), fSCLK = 4.8MHz (50% duty cycle), TA = -40C to +85C, unless otherwise noted. Typical values are at AVDD = DVDD = 3V (MAX1021/MAX1023/MAX1057), AVDD = DVDD = 5V (MAX1020/MAX1022/MAX1058), TA = +25C. Outputs are unloaded, unless otherwise noted.)
PARAMETER SYMBOL Fullscale input CONDITIONS MAX1021/MAX1023/ MAX1057 AVDD = 2.7V to 3.6V MAX1020/MAX1022/ MAX1058 AVDD = 4.75V to 5.25V 40 40/60 duty cycle 60/40 duty cycle CLOAD = 20pF 0 20 CLOAD = 20pF, SLOW = 0 CLOAD = 20pF, SLOW = 1 CLOAD = 20pF, SLOW = 0 CLOAD = 20pF, SLOW = 1 1.8 10 1.8 10 10 0 10 0 50 CLOAD = 20pF CLOAD = 20pF CKSEL = 01 (temp sense) or CKSEL = 10 (temp sense), internal reference on CKSEL = 01 (temp sense) or CKSEL = 10 (temp sense), internal reference initially off CS or CNVST Rise to EOC Fall tDOV CKSEL = 01 (voltage conversion) CKSEL = 10 (voltage conversion), internal reference on CKSEL = 10 (voltage conversion), internal reference initially off CNVST Pulse Width tCSW CKSEL = 00, CKSEL = 01 (temp sense) CKSEL = 01 (voltage conversion) 40 1.4 1.5 30 55 25 25.0 12.0 40 12.0 40 16 16 100 MIN TYP 0.06 0.06 MAX 0.5 mV 0.5 UNITS
MAX1020-MAX1023/MAX1057/MAX1058
ADC Positive-Supply Rejection
PSRA
TIMING CHARACTERISTICS (Figures 6-13) SCLK Clock Period SCLK Pulse-Width High SCLK Pulse-Width Low GPIO Output Rise/Fall After CS Rise GPIO Input Setup Before CS Fall LDAC Pulse Width SCLK Fall to DOUT Transition (Note 16) SCLK Rise to DOUT Transition (Notes 16, 17) CS Fall to SCLK Fall Setup Time SCLK Fall to CS Rise Setup Time DIN to SCLK Fall Setup Time DIN to SCLK Fall Hold Time CS Pulse-Width High CS Rise to DOUT Disable CS Fall to DOUT Enable EOC Fall to CS Fall tCP tCH tCL tGOD tGSU tLDACPWL tDOT tDOT tCSS tCSH tDS tDH tCSPWH tDOD tDOE tRDS ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns
120 8 8 80 ns s s
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7
10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports MAX1020-MAX1023/MAX1057/MAX1058
ELECTRICAL CHARACTERISTICS (continued)
(AVDD = DVDD = 2.7V to 3.6V (MAX1021/MAX1023/MAX1057), external reference VREF = 2.5V (MAX1021/MAX1023/MAX1057), AVDD = DVDD = 4.75V to 5.25V (MAX1020/MAX1022/MAX1058), external reference VREF = 4.096V (MAX1020/MAX1022/MAX1058), fSCLK = 4.8MHz (50% duty cycle), TA = -40C to +85C, unless otherwise noted. Typical values are at AVDD = DVDD = 3V (MAX1021/MAX1023/MAX1057), AVDD = DVDD = 5V (MAX1020/MAX1022/MAX1058), TA = +25C. Outputs are unloaded, unless otherwise noted.) Note 1: Tested at DVDD = AVDD = +3.6V (MAX1021/MAX1023/MAX1057), DVDD = AVDD = +5.25V (MAX1020/MAX1022/MAX1058). Note 2: Offset nulled. Note 3: No bus activity during conversion. Conversion time is defined as the number of conversion clock cycles multiplied by the clock period. Note 4: See Table 5 for reference-mode details. Note 5: Not production tested. Guaranteed by design. Note 6: See the ADC/DAC References section. Note 7: Fast automated test, excludes self-heating effects. Note 8: Specified over the -40C to +85C temperature range. Note 9: REFSEL[1:0] = 00 or when DACs are not powered up. Note 10: DAC linearity, gain, and offset measurements are made between codes 115 and 3981. Note 11: The DAC buffers are guaranteed by design to be stable with a 500pF load. Note 12: Time required by the DAC output to power up and settle within 1 LSB in the external reference mode. Note 13: All DAC dynamic specifications are valid for a load of 1nF and 10k. Note 14: Only one digital output (either DOUT, EOC, or the GPIOs) can be indefinitely shorted to either supply at one time. Note 15: All digital inputs at either DVDD or DGND. DVDD should not exceed AVDD. Note 16: See the Reset Register section and Table 9 for details on programming the SLOW bit. Note 17: Clock mode 11 only.
Typical Operating Characteristics
(AVDD = DVDD = 3V (MAX1021/MAX1023/MAX1057), external VREF = 2.5V (MAX1021/MAX1023/MAX1057), AVDD = DVDD = 5V (MAX1020/MAX1022/MAX1058), external VREF = 4.096V (MAX1020/MAX1022/MAX1058), fCLK = 4.8MHz (50% duty cycle), fSAMPLE = 300ksps, CLOAD = 50pF, 0.1F capacitor at REF, TA = +25C, unless otherwise noted.)
SHUTDOWN CURRENT vs. ANALOG SUPPLY VOLTAGE
MAX1020 toc01
SHUTDOWN CURRENT vs. ANALOG SUPPLY VOLTAGE
MAX1020 toc02
SHUTDOWN CURRENT vs. TEMPERATURE
MAX1020 toc03
0.30 0.25 SHUTDOWN CURRENT (A) 0.20 0.15 0.10 0.05 MAX1020/MAX1022/MAX1058 0 4.75 4.85 4.95 5.05 5.15
0.20
0.6 0.5 SHUTDOWN CURRENT (A) 0.4 0.3 0.2 0.1
SHUTDOWN CURRENT (A)
0.18
0.16
0.14
0.12 MAX1021/MAX1023/MAX1057 0.10 5.25 2.7 3.0 3.3 3.6 SUPPLY VOLTAGE (V)
0 -40 -15 10 35 60 85 TEMPERATURE (C)
SUPPLY VOLTAGE (V)
8
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10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports
Typical Operating Characteristics (continued)
(AVDD = DVDD = 3V (MAX1021/MAX1023/MAX1057), external VREF = 2.5V (MAX1021/MAX1023/MAX1057), AVDD = DVDD = 5V (MAX1020/MAX1022/MAX1058), external VREF = 4.096V (MAX1020/MAX1022/MAX1058), fCLK = 4.8MHz (50% duty cycle), fSAMPLE = 300ksps, CLOAD = 50pF, 0.1F capacitor at REF, TA = +25C, unless otherwise noted.)
INTERNAL OSCILLATOR FREQUENCY vs. ANALOG SUPPLY VOLTAGE
MAX1020 toc04
MAX1020-MAX1023/MAX1057/MAX1058
INTERNAL OSCILLATOR FREQUENCY vs. ANALOG SUPPLY VOLTAGE
MAX1020 toc05
INTERNAL OSCILLATOR FREQUENCY vs. TEMPERATURE
INTERNAL OSCILLATOR FREQUENCY (MHz)
MAX1020 toc06
4.5 INTERNAL OSCILLATOR FREQUENCY (MHz)
4.90 INTERNAL OSCILLATOR FREQUENCY (MHz) 4.85 4.80 4.75 4.70 4.65 MAX1021/MAX1023/MAX1057 4.60 2.7 3.0 3.3
5.0 4.8 4.6 MAX1021/MAX1023/MAX1057 4.4 4.2 4.0 3.8
4.4
4.3
4.2
4.1 MAX1020/MAX1022/MAX1058 4.0 4.75 4.85 4.95 5.05 5.15 5.25 SUPPLY VOLTAGE (V)
MAX1020/MAX1022/MAX1058
3.6
-40
-15
10
35
60
85
SUPPLY VOLTAGE (V)
TEMPERATURE (C)
ADC INTEGRAL NONLINEARITY vs. OUTPUT CODE
MAX1020 toc07
ADC INTEGRAL NONLINEARITY vs. OUTPUT CODE
MAX1020 toc08
ADC DIFFERENTIAL NONLINEARITY vs. OUTPUT CODE
MAX1020 toc09
0.3 INTEGRAL NONLINEARITY (LSB) 0.2 0.1 0 -0.1 -0.2 MAX1020/MAX1022/MAX1058 -0.3 0 256 512 OUTPUT CODE 768
0.3 INTEGRAL NONLINEARITY (LSB) 0.2 0.1 0 -0.1 -0.2 MAX1021/MAX1023/MAX1057 -0.3
0.3 DIFFERENTIAL NONLINEARITY (LSB) 0.2 0.1 0 -0.1 -0.2 MAX1020/MAX1022/MAX1058 -0.3
1024
0
256
512 OUTPUT CODE
768
1024
0
256
512 OUTPUT CODE
768
1024
ADC DIFFERENTIAL NONLINEARITY vs. OUTPUT CODE
MAX1020 toc10
ADC OFFSET ERROR vs. ANALOG SUPPLY VOLTAGE
MAX1020 toc11
ADC OFFSET ERROR vs. ANALOG SUPPLY VOLTAGE
MAX1020 toc12
0.3 DIFFERENTIAL NONLINEARITY (LSB) 0.2 0.1 0 -0.1 -0.2 MAX1021/MAX1023/MAX1057 -0.3 0 256 512 OUTPUT CODE 768
-0.4
0
OFFSET ERROR (LSB)
-0.6
OFFSET ERROR (LSB)
-0.5
-0.5
-1.0
-0.7
-1.5 MAX1020/MAX1022/MAX1058 MAX1021/MAX1023/MAX1057 -2.0 4.75 4.85 4.95 5.05 5.15 5.25 2.7 3.0 3.3 3.6 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V)
-0.8 1024
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10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports MAX1020-MAX1023/MAX1057/MAX1058
Typical Operating Characteristics (continued)
(AVDD = DVDD = 3V (MAX1021/MAX1023/MAX1057), external VREF = 2.5V (MAX1021/MAX1023/MAX1057), AVDD = DVDD = 5V (MAX1020/MAX1022/MAX1058), external VREF = 4.096V (MAX1020/MAX1022/MAX1058), fCLK = 4.8MHz (50% duty cycle), fSAMPLE = 300ksps, CLOAD = 50pF, 0.1F capacitor at REF, TA = +25C, unless otherwise noted.)
ADC OFFSET ERROR vs. TEMPERATURE
MAX1020/MAX1022/MAX1058 OFFSET ERROR (LSB) -0.5 GAIN ERROR (LSB) GAIN ERROR (LSB) 0.40 0.35 0.30 0.25 MAX1020/MAX1022/MAX1058 -2.0 -40 -15 10 35 60 85 TEMPERATURE (C) -0.075 4.75 4.85 4.95 5.05 5.15 5.25 SUPPLY VOLTAGE (V) 0.20 2.7 3.0 3.3 3.6 SUPPLY VOLTAGE (V) MAX1021/MAX1023/MAX1057 0
MAX1020 toc13
ADC GAIN ERROR vs. ANALOG SUPPLY VOLTAGE
MAX1020 toc14
ADC GAIN ERROR vs. ANALOG SUPPLY VOLTAGE
MAX1020 toc15
0
0.050
0.50 0.45
0.025
-1.0
-0.025
MAX1021/MAX1023/MAX1057 -1.5 -0.050
ADC GAIN ERROR vs. TEMPERATURE
ADC EXTERNAL REFERENCE INPUT CURRENT (A)
MAX1020 toc16
ADC EXTERNAL REFERENCE INPUT CURRENT vs. SAMPLING RATE
MAX1020 toc17
ANALOG SUPPLY CURRENT vs. SAMPLING RATE
MAX1020 toc18
1.00 0.75 GAIN ERROR (LSB) 0.50 0.25 MAX1021/MAX1023/MAX1057 0 -0.25 -0.50 -40 -15 10 35 60 MAX1020/MAX1022/MAX1058
60 50 40 MAX1020/MAX1022/MAX1058 30 20 10 MAX1021/MAX1023/MAX1057 0 0 50 100 150 200 250
3.0 ANALOG SUPPLY CURRENT (mA) 2.5 MAX1020/MAX1022/MAX1058 2.0 1.5 1.0 0.5 0 MAX1021/MAX1023/MAX1057
85
300
0
50
100
150
200
250
300
TEMPERATURE (C)
SAMPLING RATE (ksps)
SAMPLING RATE (ksps)
ANALOG SUPPLY CURRENT vs. ANALOG SUPPLY VOLTAGE
MAX1020 toc19
ANALOG SUPPLY CURRENT vs. ANALOG SUPPLY VOLTAGE
MAx1020 toc20
ANALOG SUPPLY CURRENT vs. TEMPERATURE
MAX1020 toc21
2.8 2.7 SUPPLY CURRENT (mA) 2.6 2.5 2.4 2.3 MAX1020/MAX1022/MAX1058 2.2 4.75 4.85 4.95 5.05 5.15
2.6 2.5 SUPPLY CURRENT (mA) 2.4 2.3 2.2 2.1 2.0 MAX1021/MAX1023/MAX1057 1.9
2.7 ANALOG SUPPLY CURRENT (mA)
2.6
2.5
2.4
MAX1020/MAX1022/MAX1058 2.3 3.6 -40 -15 10 35 60 85
5.25
2.7
3.0
3.3
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
TEMPERATURE (C)
10
______________________________________________________________________________________
10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports
Typical Operating Characteristics (continued)
(AVDD = DVDD = 3V (MAX1021/MAX1023/MAX1057), external VREF = 2.5V (MAX1021/MAX1023/MAX1057), AVDD = DVDD = 5V (MAX1020/MAX1022/MAX1058), external VREF = 4.096V (MAX1020/MAX1022/MAX1058), fCLK = 4.8MHz (50% duty cycle), fSAMPLE = 300ksps, CLOAD = 50pF, 0.1F capacitor at REF, TA = +25C, unless otherwise noted.)
ANALOG SUPPLY CURRENT vs. TEMPERATURE
MAX1020 toc22
MAX1020-MAX1023/MAX1057/MAX1058
DAC INTEGRAL NONLINEARITY vs. OUTPUT CODE
MAX1020 toc23
DAC INTEGRAL NONLINEARITY vs. OUTPUT CODE
MAX1020 toc24
2.16 ANALOG SUPPLY CURRENT (mA) 2.15 2.14 2.13 2.12 2.11 MAX1021/MAX1023/MAX1057 2.10 -40 -15 10 35 60
0.3 INTEGRAL NONLINEARITY (LSB) 0.2 0.1 0 -0.1 -0.2 MAX1020/MAX1022/MAX1058 -0.3 0 256 512 OUTPUT CODE 768
0.3 INTEGRAL NONLINEARITY (LSB) 0.2 0.1 0 -0.1 -0.2 MAX1021/MAX1023/MAX1057 -0.3
85
1024
0
256
512 OUTPUT CODE
768
1024
TEMPERATURE (C)
DAC DIFFERENTIAL NONLINEARITY vs. OUTPUT CODE
MAX1020 toc25
DAC DIFFERENTIAL NONLINEARITY vs. OUTPUT CODE
MAX1020 toc26
DAC FULL-SCALE ERROR vs. ANALOG SUPPLY VOLTAGE
MAX1020 toc27
0.10 DIFFERENTIAL NONLINEARITY (LSB)
0.10 DIFFERENTIAL NONLINEARITY (LSB)
0.04 DAC FULL-SCALE ERROR (LSB)
0.05
0.05
0.03
0
0
0.02
-0.05 MAX1020/MAX1022/MAX1058 -0.10 1023 1026 1029 1032 1035 1038 OUTPUT CODE
-0.05 MAX1021/MAX1023/MAX1057 -0.10 1023 1026 1029 1032 1035 1038 OUTPUT CODE
0.01 MAX1020/MAX1022/MAX1058 0 4.75 4.85 4.95 5.05 5.15 5.25 SUPPLY VOLTAGE (V)
DAC FULL-SCALE ERROR vs. ANALOG SUPPLY VOLTAGE
MAx1020 toc28
DAC FULL-SCALE ERROR vs. TEMPERATURE
MAX1020 toc29
DAC FULL-SCALE ERROR vs. TEMPERATURE
-0.25 DAC FULL-SCALE ERROR (LSB) -0.50 EXTERNAL REFERENCE = 2.500V -0.75 -1.00 INTERNAL REFERENCE -1.25 -1.50 -1.75
MAX1020 toc30
-0.50 DAC FULL-SCALE ERROR (LSB)
2.0 DAC FULL-SCALE ERROR (LSB) 1.5 1.0 0.5 0 EXTERNAL REFERENCE = 4.096V -0.5 MAX1020/MAX1022/MAX1058 -1.0 INTERNAL REFERENCE
0
-0.55
-0.60
-0.65 MAX1021/MAX1023/MAX1057 -0.70 2.7 3.0 3.3 3.6 SUPPLY VOLTAGE (V)
MAX1021/MAX1023/MAX1057 -2.00 60 85 -40 -15 10 35 60 85 TEMPERATURE (C)
-40
-15
10
35
TEMPERATURE (C)
______________________________________________________________________________________
11
10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports MAX1020-MAX1023/MAX1057/MAX1058
Typical Operating Characteristics (continued)
(AVDD = DVDD = 3V (MAX1021/MAX1023/MAX1057), external VREF = 2.5V (MAX1021/MAX1023/MAX1057), AVDD = DVDD = 5V (MAX1020/MAX1022/MAX1058), external VREF = 4.096V (MAX1020/MAX1022/MAX1058), fCLK = 4.8MHz (50% duty cycle), fSAMPLE = 300ksps, CLOAD = 50pF, 0.1F capacitor at REF, TA = +25C, unless otherwise noted.)
DAC FULL-SCALE ERROR vs. REFERENCE VOLTAGE
MAX1020 toc31
DAC FULL-SCALE ERROR vs. REFERENCE VOLTAGE
MAX1020 toc32
DAC FULL-SCALE ERROR vs. LOAD CURRENT
MAX1020 toc33
1.00 0.75 DAC FULL-SCALE ERROR (LSB) 0.50 0.25 0 -0.25 -0.50 -0.75 MAX1020/MAX1022/MAX1058 -1.00 0 1 2 3 4 5 REFERENCE VOLTAGE (V)
0 DAC FULL-SCALE ERROR (LSB) -0.5 -1.0 -1.5 -2.0 -2.5 MAX1021/MAX1023/MAX1057 -3.0 0 0.5 1.0 1.5 2.0 2.5
1 DAC FULL-SCALE ERROR (LSB)
0
-1
-2
-3 MAX1020/MAX1022/MAX1058
3.0
-4 0 5 10 15 20 25 30 LOAD CURRENT (mA)
REFERENCE VOLTAGE (V)
DAC FULL-SCALE ERROR vs. LOAD CURRENT
MAX1020 toc34
INTERNAL REFERENCE VOLTAGE vs. TEMPERATURE
MAX1020 toc35
INTERNAL REFERENCE VOLTAGE vs. TEMPERATURE
MAX1020 toc36
1 DAC FULL-SCALE ERROR (LSB)
4.12 INTERNAL REFERENCE VOLTAGE (V)
2.52 INTERNAL REFERENCE VOLTAGE (V)
0
4.11
2.51
-1
4.10
2.50
-2
-3 MAX1021/MAX1023/MAX1057 -4 0 0.5 1.0 1.5 2.0 2.5 3.0 LOAD CURRENT (mA)
4.09 MAX1020/MAX1022/MAX1058 4.08 -40 -15 10 35 60 85 TEMPERATURE (C)
2.49 MAX1021/MAX1023/MAX1057 2.48 -40 -15 10 35 60 85 TEMPERATURE (C)
ADC REFERENCE SUPPLY CURRENT vs. ANALOG SUPPLY VOLTAGE
MAX1020 toc37
ADC REFERENCE SUPPLY CURRENT vs. ANALOG SUPPLY VOLTAGE
MAX1020 toc38
ADC REFERENCE SUPPLY CURRENT vs. TEMPERATURE
ADC REFERENCE SUPPLY CURRENT (A)
MAX1020 toc39
43.0 ADC REFERENCE SUPPLY CURRENT (A)
25.8 ADC REFERENCE SUPPLY CURRENT (A)
50
42.8
48
25.7
42.6
46
25.6
42.4
44
42.2 MAX1020/MAX1022/MAX1058 42.0 4.75 4.85 4.95 5.05 5.15 5.25 SUPPLY VOLTAGE (V)
25.5 MAX1021/MAX1023/MAX1057 25.4 2.7 3.0 3.3 3.6 SUPPLY VOLTAGE (V)
42 MAX1020/MAX1022/MAX1058 40 -40 -15 10 35 60 85 TEMPERATURE (C)
12
______________________________________________________________________________________
10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports
Typical Operating Characteristics (continued)
(AVDD = DVDD = 3V (MAX1021/MAX1023/MAX1057), external VREF = 2.5V (MAX1021/MAX1023/MAX1057), AVDD = DVDD = 5V (MAX1020/MAX1022/MAX1058), external VREF = 4.096V (MAX1020/MAX1022/MAX1058), fCLK = 4.8MHz (50% duty cycle), fSAMPLE = 300ksps, CLOAD = 50pF, 0.1F capacitor at REF, TA = +25C, unless otherwise noted.)
ADC REFERENCE SUPPLY CURRENT vs. TEMPERATURE
MAX1020 toc40
MAX1020-MAX1023/MAX1057/MAX1058
ADC FFT PLOT
MAX1020 toc41
ADC IMD PLOT
-20 -40 AMPLITUDE (dB) -60 -80 -100 -120 -140 -160 fCLK = 5.24288MHz fIN1 = 9.0kHz fIN2 = 11.0kHz AIN = -6dBFS IMD = 78.0dBc
MAX1020 toc42
27.00 ADC REFERENCE SUPPLY CURRENT (A) 26.75 26.50
0 -20 -40 AMPLITUDE (dB) -60 -80 -100 -120 -140
26.25 26.00 25.75 25.50 25.25 MAX1021/MAX1023/MAX1057 25.00 -40 -15 10 35 60 85 TEMPERATURE (C)
fSAMPLE = 32.768kHz fANALOG_)N = 10.080kHz fCLK = 5.24288MHz SINAD = 61.21dBc SNR = 61.21dBc THD = 73.32dBc SFDR = 81.25dBc
0
-160 0 50 100 150 200 ANALOG INPUT FREQUENCY (kHz)
0
50
100
150
200
ANALOG INPUT FREQUENCY (kHz)
ADC CROSSTALK PLOT
MAX1020 toc43
DAC OUTPUT LOAD REGULATION vs. OUTPUT CURRENT
MAX1020 toc44
DAC OUTPUT LOAD REGULATION vs. OUTPUT CURRENT
1.28 DAC OUTPUT VOLTAGE (V) 1.27 1.26 1.25 1.24 1.23 1.22 1.21 SINKING SOURCING DAC OUTPUT = MIDSCALE MAX1021/MAX1023/MAX1057 -30 -20 0 10 -10 OUTPUT CURRENT (mA) 20 30
MAX1020 toc45
0 -20 -40 AMPLITUDE (dB) -60 -80 -100 -120 -140 -160 0 50 100
DAC OUTPUT VOLTAGE (V)
fCLK = 5.24288MHz fIN1 = 10.080kHz fIN2 = 8.0801kHz SNR = 61.11dBc THD = 73.32dBc ENOB = 9.86 BITS SFDR = 86.34dBc
2.08 2.07 2.06 2.05 2.04 2.03 2.02 2.01 SINKING SOURCING DAC OUTPUT = MIDSCALE MAX1020/MAX1022/MAX1058 -30 0 30 60
1.29
150
200
2.00 90 OUTPUT CURRENT (mA)
ANALOG INPUT FREQUENCY (kHz)
GPIO OUTPUT VOLTAGE vs. SOURCE CURRENT
MAX1020 toc46
GPIO OUTPUT VOLTAGE vs. SOURCE CURRENT
MAX1020 toc47
GPIO OUTPUT VOLTAGE vs. SINK CURRENT
GPIOB0-B3, C0-C3 OUTPUTS GPIO OUTPUT VOLTAGE (mV) 1200
MAX1020 toc48
5
3.0 2.5 GPIO OUTPUT VOLTAGE (V) 2.0 1.5 1.0 0.5 0
MAX1020/MAX1022/MAX1058
MAX1021/MAX1023/MAX1057 GPIOA0-A3 OUTPUTS
1500
GPIO OUTPUT VOLTAGE (V)
4 GPIOA0-A3 OUTPUTS
3
900
2 GPIOB0-B3, C0-C3 OUTPUTS
GPIOB0-B3, C0-C3 OUTPUTS
600 GPIOA0-A3 OUTPUTS 300 MAX1020/MAX1022/MAX1058 0
1
0 0 20 40 60 80 100 SOURCE CURRENT (mA)
0
20
40
60
80
100
0
20
40
60
80
100
SOURCE CURRENT (mA)
SINK CURRENT (mA)
______________________________________________________________________________________
13
10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports MAX1020-MAX1023/MAX1057/MAX1058
Typical Operating Characteristics (continued)
(AVDD = DVDD = 3V (MAX1021/MAX1023/MAX1057), external VREF = 2.5V (MAX1021/MAX1023/MAX1057), AVDD = DVDD = 5V (MAX1020/MAX1022/MAX1058), external VREF = 4.096V (MAX1020/MAX1022/MAX1058), fCLK = 4.8MHz (50% duty cycle), fSAMPLE = 300ksps, CLOAD = 50pF, 0.1F capacitor at REF, TA = +25C, unless otherwise noted.)
GPIO OUTPUT VOLTAGE vs. SINK CURRENT
MAX1020 toc49
TEMPERATURE SENSOR ERROR vs. TEMPERATURE
0.75 0.50 0.25 0 -0.25 -0.50 -0.75
MAX1020 toc50
DAC-TO-DAC CROSSTALK RLOAD = 10k, CLOAD = 100pF
MAX1020 toc51
1500 GPIOB0-B3, C0-C3 OUTPUTS GPIO OUTPUT VOLTAGE (mV) 1200
1.00 TEMPERATURE SENSOR ERROR (C)
VOUTA 1V/div
900
600 GPIOA0-A3 OUTPUTS MAX1021/MAX1023/MAX1057 0 0 10 20 30 40 50 60 SINK CURRENT (mA)
300
VOUTB 10mV/div AC-COUPLED MAX1021/MAX1023/MAX1057 -40 -15 10 35 60 85 100s TEMPERATURE (C)
-1.00
DAC-TO-DAC CROSSTALK RLOAD = 10k, CLOAD = 100pF
MAX1020 toc52
DYNAMIC RESPONSE RISE TIME RLOAD = 10k, CLOAD = 100pF
MAX1020 toc53
DYNAMIC RESPONSE RISE TIME RLOAD = 10k, CLOAD = 100pF
MAX1020 toc54
MAX1021/MAX1023/MAX1057 VOUTA 2V/div CS 2V/div
VOUT 1V/div
VOUTB 10mV/div AC-COUPLED MAX1020/MAX1022/MAX1058 100s 1s
CS 1V/div MAX1020/MAX1022/MAX1058 1s
VOUT 2V/div
DYNAMIC RESPONSE FALL TIME RLOAD = 10k, CLOAD = 100pF
MAX1020 toc55
DYNAMIC RESPONSE FALL TIME RLOAD = 10k, CLOAD = 100pF
MAX1020 toc56
MAJOR CARRY TRANSITION RLOAD = 10k, CLOAD = 100pF
MAX1020 toc57
MAX1021/MAX1023/MAX1057 CS 2V/div
VOUT 1V/div
CS 1V/div
CS 1V/div MAX1020/MAX1022/MAX1058 1s 1s
VOUT 2V/div MAX1021/MAX1023/MAX1057 1s
VOUT 10mV/div AC-COUPLED
14
______________________________________________________________________________________
10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports
Typical Operating Characteristics (continued)
(AVDD = DVDD = 3V (MAX1021/MAX1023/MAX1057), external VREF = 2.5V (MAX1021/MAX1023/MAX1057), AVDD = DVDD = 5V (MAX1020/MAX1022/MAX1058), external VREF = 4.096V (MAX1020/MAX1022/MAX1058), fCLK = 4.8MHz (50% duty cycle), fSAMPLE = 300ksps, CLOAD = 50pF, 0.1F capacitor at REF, TA = +25C, unless otherwise noted.)
MAJOR CARRY TRANSITION RLOAD = 10k, CLOAD = 100pF
MAX1020 toc58
MAX1020-MAX1023/MAX1057/MAX1058
DAC DIGITAL FEEDTHROUGH (RLOAD = 10k, CLOAD = 100pF, CS = HIGH, DIN = LOW)
MAX1020 toc59
DAC DIGITAL FEEDTHROUGH (RLOAD = 10k, CLOAD = 100pF, CS = HIGH, DIN = LOW)
MAX1020 toc60
CS 2V/div
SCLK 1V/div
SCLK 2V/div
VOUT 20mV/div AC-COUPLED MAX1020/MAX1022/MAX1058 1s MAX1021/MAX1023/MAX1057 200ns
VOUT 100mV/div AC-COUPLED MAX1020/MAX1022/MAX1058 200ns
VOUT 100mV/div AC-COUPLED
NEGATIVE FULL-SCALE SETTLING TIME RLOAD = 10k, CLOAD = 100pF
MAX1020 toc61
NEGATIVE FULL-SCALE SETTLING TIME RLOAD = 10k, CLOAD = 100pF
MAX1020 toc62
POSITIVE FULL-SCALE SETTLING TIME RLOAD = 10k, CLOAD = 100pF
MAX1020 toc63
MAX1021/MAX1023/MAX1057
MAX1021/MAX1023/MAX1057
VOUT 1V/div
VLDAC 2V/div
VOUT_ 1V/div
VOUT_ 2V/div
VLDAC 1V/div 1s
MAX1020/MAX1022/MAX1058 2s 1s
VLDAC 1V/div
POSITIVE FULL-SCALE SETTLING TIME RLOAD = 10k, CLOAD = 100pF
MAX1020 toc64
ADC REFERENCE FEEDTHROUGH RLOAD = 10k, CLOAD = 100pF
MAX1020 toc65
ADC REFERENCE FEEDTHROUGH RLOAD = 10k, CLOAD = 100pF
MAX1020 toc66
VLDAC 2V/div
VREF2 1V/div
VREF2 2V/div
VOUT_ 2V/div
VDAC-OUT 10mV/div AC-COUPLED MAX1021/MAX1023/MAX1057 ADC REFERENCE SWITCHING 200s MAX1020/MAX1022/MAX1058 ADC REFERENCE SWITCHING 200s
VDAC-OUT 2mV/div AC-COUPLED
MAX1020/MAX1022/MAX1058 1s
______________________________________________________________________________________
15
10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports MAX1020-MAX1023/MAX1057/MAX1058
Pin Description
MAX1020/ MAX1021 1, 2 3 4 5 6 MAX1022/ MAX1023 -- 3 4 5 6 MAX1057/ MAX1058 -- 4 7 8 9 NAME FUNCTION
GPIOA0, GPIOA1 General-Purpose I/O A0, A1. GPIOA0, A1 can sink and source 15mA. EOC DVDD DGND DOUT Active-Low End-of-Conversion Output. Data is valid after the falling edge of EOC. Digital Positive-Power Input. Bypass DVDD to DGND with a 0.1F capacitor. Digital Ground. Connect DGND to AGND. Serial-Data Output. Data is clocked out on the falling edge of the SCLK clock in modes 00, 01, and 10. Data is clocked out on the rising edge of the SCLK clock in mode 11. It is high impedance when CS is high. Serial-Clock Input. Clocks data in and out of the serial interface. (Duty cycle must be 40% to 60%.) See Table 5 for details on programming the clock mode. Serial-Data Input. DIN data is latched into the serial interface on the falling edge of SCLK. DAC Outputs Positive Analog Power Input. Bypass AVDD to AGND with a 0.1F capacitor. Analog Ground No Connection. Not internally connected. Active-Low Load DAC. LDAC is an asynchronous active-low input that updates the DAC outputs. Drive LDAC low to make the DAC registers transparent. Active-Low Chip-Select Input. When CS is low, the serial interface is enabled. When CS is high, DOUT is high impedance. Reset Select. Select DAC wake-up mode. Set RES_SEL low to wake up the DAC outputs with a 100k resistor to GND or set RES_SEL high to wake up the DAC outputs with a 100k resistor to VREF. Set RES_SEL high to power up the DAC input register to FFFh. Set RES_SEL low to power up the DAC input register to 000h.
7
7
10
SCLK
8 9-12, 16-19 13 14
8 9-12, 16-19 13 14
11 12-15, 22-25 18 19 --
DIN OUT0-OUT7 AVDD AGND N.C.
15, 23, 32, 2, 15, 24, 32 32 33 20 20
26
LDAC
21
21
27
CS
22
22
28
RES_SEL
24, 25
--
--
GPIOC0, GPIOC1 General-Purpose I/O C0, C1. GPIOC0, C1 can sink 4mA and source 2mA.
16
______________________________________________________________________________________
10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports
Pin Description (continued)
MAX1020/ MAX1021 MAX1022/ MAX1023 MAX1057/ MAX1058 NAME FUNCTION Reference 1 Input. Reference voltage; leave unconnected to use the internal reference (2.5V for the MAX1021/MAX1023/MAX1057 or 4.096V for the MAX1020/MAX1022/MAX1058). REF1 is the positive reference in ADC external differential reference mode. Bypass REF1 to AGND with a 0.1F capacitor in external reference mode only. See the ADC/DAC References section. Analog Inputs Reference 2 Input/Analog-Input Channel 6. See Table 5 for details on programming the setup register. REF2 is the negative reference in the ADC external differential reference. Active-Low Conversion-Start Input/Analog Input 7. See Table 5 for details on programming the setup register. Active-Low Conversion-Start Input/Analog Input 11. See Table 5 for details on programming the setup register. Analog Inputs Reference 2 Input/Analog-Input Channel 10. See Table 5 for details on programming the setup register. REF2 is the negative reference in the ADC external differential reference. Active-Low Conversion-Start Input/Analog Input 15. See Table 5 for details on programming the setup register.
MAX1020-MAX1023/MAX1057/MAX1058
26
26
35
REF1
27-31, 34 35
-- --
-- --
AIN0-AIN5 REF2/AIN6
36 --
-- 1 23, 25, 27-31, 33, 34, 35 36
-- --
CNVST/AIN7 CNVST/AIN11
--
--
AIN0-AIN9
--
--
REF2/AIN10
-- -- -- -- --
-- -- -- -- --
1 2, 3, 5, 6 16, 17, 20, 21 29-32 33, 34, 36-47 48
CNVST/AIN15
GPIOA0-GPIOA3 General-Purpose I/O A0-A3. GPIOA0-GPIOA3 can sink and source 15mA. GPIOB0-GPIOB3 GPIOC0-GPIOC3 AIN0-AIN13 General-Purpose I/O B0-B3. GPIOB0-GPIOB3 can sink 4mA and source 2mA. General-Purpose I/O C0-C3. GPIOC0-GPIOC3 can sink 4mA and source 2mA. Analog Inputs Reference 2 Input/Analog-Input Channel 14. See Table 5 for details on programming the setup register. REF2 is the negative reference in the ADC external differential reference. Exposed Paddle. Must be externally connected to AGND. Do not use as a ground connect.
--
--
REF2/AIN14
--
--
--
EP
______________________________________________________________________________________
17
10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports MAX1020-MAX1023/MAX1057/MAX1058
Detailed Description
The MAX1020-MAX1023/MAX1057/MAX1058 integrate a multichannel, 10-bit ADC and an octal, 10-bit DAC in a single IC. These devices also include a temperature sensor and configurable GPIOs with a 25MHz SPI/QSPI-/MICROWIRE-compatible serial interface. The ADC is available in 8/12/16 input-channel versions. The octal DAC outputs settle within 2.0s, and the ADC has a 300ksps conversion rate. All devices include an internal reference (2.5V or 4.096V) providing a well-regulated, low-noise reference for both the ADC and DAC. Programmable reference modes for the ADC and DAC allow the use of an internal reference, an external reference, or a combination of both. Features such as an internal 1C accurate temperature sensor, FIFO, scan modes, programmable internal or external clock modes, data averaging, and AutoShutdown allow users to minimize both power consumption and processor requirements. The low glitch energy (4nV*s) and low digital feedthrough (0.5nV*s) of the integrated octal DACs make these devices ideal for digital control of fast-response closed-loop systems. The devices are guaranteed to operate with a supply voltage from +2.7V to +3.6V (MAX1021/MAX1023/ MAX1057) and from +4.5V to +5.5V (MAX1020/ MAX1022/MAX1058), they consume 25mA at 300ksps throughput, only 22A at 1ksps throughput, and under 0.2A in the shutdown mode. The MAX1057/MAX1058 feature 12 GPIOs, while the MAX1020/MAX1021 offer 4 GPIOs that can be configured as inputs or outputs. Figure 1 shows the MAX1057/MAX1058 functional diagram. The MAX1020/MAX1021 only include the GPIO A0, A1, GPIO C0, C1 block. The MAX1022/MAX1023 exclude the GPIOs. The output-conditioning circuitry takes the internal parallel data bus and converts it to a serial data format at DOUT, with the appropriate wakeup timing. The arithmetic logic unit (ALU) performs the averaging function. trol registers to the same value. The MAX1020- MAX1023/MAX1057/MAX1058 operate with SCLK idling high or low, and thus operate with CPOL = CPHA = 0 or CPOL = CPHA = 1. Set CS low to latch any input data at DIN on the falling edge of SCLK. Output data at DOUT is updated on the falling edge of SCLK in clock modes 00, 01, and 10. Output data at DOUT is updated on the rising edge of SCLK in clock mode 11. See Figures 6-11. Bipolar true-differential results and temperature-sensor results are available in two's complement format, while all other results are in binary. A high-to-low transition on CS initiates the data-input operation. Serial communications to the ADC always begin with an 8-bit command byte (MSB first) loaded from DIN. The command byte and the subsequent data bytes are clocked from DIN into the serial interface on the falling edge of SCLK. The serial-interface and fastinterface circuitry is common to the ADC, DAC, and GPIO sections. The content of the command byte determines whether the SPI port should expect 8, 16, or 24 bits and whether the data is intended for the ADC, DAC, or GPIOs (if applicable). See Table 1. Driving CS high resets the serial interface. The conversion register controls ADC channel selection, ADC scan mode, and temperature-measurement requests. See Table 4 for information on writing to the conversion register. The setup register controls the clock mode, reference, and unipolar/bipolar ADC configuration. Use a second byte, following the first, to write to the unipolar-mode or bipolar-mode registers. See Table 5 for details of the setup register and see Tables 6, 7, and 8 for setting the unipolar- and bipolarmode registers. Hold CS low between the command byte and the second and third byte. The ADC averaging register is specific to the ADC. See Table 9 to address that register. Table 11 shows the details of the reset register. Begin a write to the DAC by writing 0001XXXX as a command byte. The last 4 bits of this command byte are don't-care bits. Write another 2 bytes (holding CS low) to the DAC interface register following the command byte to select the appropriate DAC and the data to be written to it. See the DAC Serial Interface section and Tables 10, 20, and 21. Write to the GPIOs (if applicable) by issuing a command byte to the appropriate register. Writing to the MAX1020/MAX1021 GPIOs requires 1 additional byte
SPI-Compatible Serial Interface
The MAX1020-MAX1023/MAX1057/MAX1058 feature a serial interface that is compatible with SPI and MICROWIRE devices. For SPI, ensure the SPI bus master (typically a microcontroller (C)) runs in master mode so that it generates the serial clock signal. Select the SCLK frequency of 25MHz or less, and set the clock polarity (CPOL) and phase (CPHA) in the C con-
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10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports MAX1020-MAX1023/MAX1057/MAX1058
GPIOA0- GPIOB0- GPIOC0- GPIOA3 GPIOB3 GPIOC3
AVDD
DVDD
USER-PROGRAMMABLE I/O
GPIO CONTROL INPUT REGISTER DAC REGISTER 10-BIT DAC
MAX1057 MAX1058
OUTPUT CONDITIONING
OSCILLATOR SCLK CS DIN DOUT SPI PORT
BUFFER
OUT0
INPUT REGISTER
DAC REGISTER
10-BIT DAC
BUFFER
OUTPUT CONDITIONING
OUT1
INPUT REGISTER
DAC REGISTER
10-BIT DAC
BUFFER
OUTPUT CONDITIONING
OUT2
INPUT REGISTER TEMPERATURE SENSOR INPUT REGISTER
DAC REGISTER
10-BIT DAC
BUFFER
OUTPUT CONDITIONING
OUT3
DAC REGISTER
10-BIT DAC
BUFFER
OUTPUT CONDITIONING
OUT4
ADDRESS
EOC CNVST AIN0 AIN13 REF2/ AIN14 CNVST/ AIN15 T/H
LOGIC CONTROL
INPUT REGISTER
DAC REGISTER
10-BIT DAC
BUFFER
OUTPUT CONDITIONING
OUT5
10-BIT SAR ADC
FIFO AND ALU
INPUT REGISTER
DAC REGISTER
10-BIT DAC
BUFFER
OUTPUT CONDITIONING
OUT6
REF2
INPUT REGISTER
DAC REGISTER
10-BIT DAC
BUFFER
OUTPUT CONDITIONING
OUT7
REF1
INTERNAL REFERENCE LDAC AGND DGND RES_SEL
Figure 1. MAX1057/MAX1058 Functional Diagram
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10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports MAX1020-MAX1023/MAX1057/MAX1058
Table 1. Command Byte (MSB First)
REGISTER NAME Conversion Setup ADC Averaging DAC Select Reset GPIO Configure* GPIO Write* GPIO Read* No Operation BIT 7 1 0 0 0 0 0 0 0 0 BIT 6 CHSEL3 1 0 0 0 0 0 0 0 BIT 5 CHSEL2 CKSEL1 1 0 0 0 0 0 0 BIT 4 CHSEL1 CKSEL0 AVGON 1 0 0 0 0 0 BIT 3 CHSEL0 REFSEL1 NAVG1 X 1 0 0 0 0 BIT 2 SCAN1 REFSEL0 NAVG0 X RESET 0 0 0 0 BIT 1 SCAN0 DIFFSEL1 NSCAN1 X SLOW 1 1 0 0 BIT 0 TEMP DIFFSEL0 NSCAN0 X FBGON 1 0 1 0
X = Don't care. *Only applicable on the MAX1020/MAX1021/MAX1057/MAX1058.
following the command byte. Writing to the MAX1057/ MAX1058 requires 2 additional bytes following the command byte. See Tables 12-19 for details on GPIO configuration, writes, and reads. See the GPIO Command section. Command bytes written to the GPIOs on devices without GPIOs are ignored. Power-Up Default State The MAX1020-MAX1023/MAX1057/MAX1058 power up with all blocks in shutdown (including the reference). All registers power up in state 00000000, except for the setup register and the DAC input register. The setup register powers up at 0010 1000 with CKSEL1 = 1 and REFSEL1 = 1. The DAC input register powers up to FFFh when RES_SEL is high and it powers up to 000h when RES_SEL is low.
10-Bit ADC
The MAX1020-MAX1023/MAX1057/MAX1058 ADCs use a fully differential successive-approximation register (SAR) conversion technique and on-chip track-andhold (T/H) circuitry to convert temperature and voltage signals into 10-bit digital results. The analog inputs accept both single-ended and differential input signals. Single-ended signals are converted using a unipolar transfer function, and differential signals are converted using a selectable bipolar or unipolar transfer function. See the ADC Transfer Functions section for more data. ADC Clock Modes When addressing the setup, register bits 5 and 4 of the command byte (CKSEL1 and CKSEL0, respectively) control the ADC clock modes. See Table 5. Choose between four different clock modes for various ways to start a conversion and determine whether the acquisitions are internally or externally timed. Select clock
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mode 00 to configure CNVST/AIN_ to act as a conversion start and use it to request internally timed conversions, without tying up the serial bus. In clock mode 01, use CNVST to request conversions one channel at a time, thereby controlling the sampling speed without tying up the serial bus. Request and start internally timed conversions through the serial interface by writing to the conversion register in the default clock mode, 10. Use clock mode 11 with SCLK up to 4.8MHz for externally timed acquisitions to achieve sampling rates up to 300ksps. Clock mode 11 disables scanning and averaging. See Figures 6-9 for timing specifications on how to begin a conversion. These devices feature an active-low, end-of-conversion output. EOC goes low when the ADC completes the last requested operation and is waiting for the next command byte. EOC goes high when CS or CNVST go low. EOC is always high in clock mode 11. Single-Ended or Differential Conversions The MAX1020-MAX1023/MAX1057/MAX1058 use a fully differential ADC for all conversions. When a pair of inputs are connected as a differential pair, each input is connected to the ADC. When configured in singleended mode, the positive input is the single-ended channel and the negative input is referred to AGND. See Figure 2. In differential mode, the T/H samples the difference between two analog inputs, eliminating common-mode DC offsets and noise. IN+ and IN- are selected from the following pairs: AIN0/AIN1, AIN2/AIN3, AIN4/AIN5, AIN6/AIN7, AIN8/AIN9, AIN10/AIN11, AIN12/AIN13, AIN14/AIN15. AIN0-AIN7 are available on all devices. AIN0-AIN11 are available on the MAX1022/MAX1023.
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10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports
AIN0-AIN15 are available on the MAX1057/MAX1058. See Tables 5-8 for more details on configuring the inputs. For the inputs that are configurable as CNVST, REF2, and an analog input, only one function can be used at a time. Unipolar or Bipolar Conversions Address the unipolar- and bipolar-mode registers through the setup register (bits 1 and 0). See Table 5 for the setup register. See Figures 3 and 4 for the transferfunction graphs. Program a pair of analog inputs for differential operation by writing a one to the appropriate bit of the bipolar- or unipolar-mode register. Unipolar mode sets the differential input range from 0 to VREF1. A negative differential analog input in unipolar mode causes the digital output code to be zero. Selecting bipolar mode sets the differential input range to VREF1 / 2. The digital output code is binary in unipolar mode and two's complement in bipolar mode. In single-ended mode, the MAX1020-MAX1023/ MAX1057/MAX1058 always operate in unipolar mode. The analog inputs are internally referenced to AGND with a full-scale input range from 0 to the selected reference voltage. Analog Input (T/H) The equivalent circuit of Figure 2 shows the ADC input architecture of the MAX1020-MAX1023/MAX1057/ MAX1058. In track mode, a positive input capacitor is connected to AIN0-AIN15 in single-ended mode and AIN0, AIN2, and AIN4-AIN14 (only positive inputs) in differential mode. A negative input capacitor is connected to AGND in single-ended mode or AIN1, AIN3, and AIN5-AIN15 (only negative inputs) in differential mode. For external T/H timing, use clock mode 01. After the T/H enters hold mode, the difference between the sampled positive and negative input voltages is converted. The input capacitance charging rate determines the time required for the T/H to acquire an input signal. If the input signal's source impedance is high, the required acquisition time lengthens. Any source impedance below 300 does not significantly affect the ADC's AC performance. A high-impedance source can be accommodated either by lengthening tACQ (only in clock mode 01) or by placing a 1F capacitor between the positive and negative analog inputs. The combination of the analog-input source impedance and the capacitance at the analog input creates an RC filter that limits the analog input bandwidth. Input Bandwidth The ADC's input-tracking circuitry has a 1MHz smallsignal bandwidth, making it is possible to digitize highspeed transient events and measure periodic signals with bandwidths exceeding the ADC's sampling rate by using undersampling techniques. Anti-alias prefiltering of the input signals is necessary to avoid high-frequency signals aliasing into the frequency band of interest. Analog-Input Protection Internal electrostatic-discharge (ESD) protection diodes clamp all analog inputs to AVDD and AGND, allowing the inputs to swing from (AGND - 0.3V) to (AVDD + 0.3V) without damage. However, for accurate conversions near full scale, the inputs must not exceed AVDD by more than 50mV or be lower than AGND by 50mV. If an analog input voltage exceeds the supplies, limit the input current to 2mA. Internal FIFO The MAX1020-MAX1023/MAX1057/MAX1058 contain a first-in/first-out (FIFO) buffer that holds up to 16 ADC results plus one temperature result. The internal FIFO allows the ADC to process and store multiple internally clocked conversions and a temperature measurement without being serviced by the serial bus. If the FIFO is filled and further conversions are requested without reading from the FIFO, the oldest ADC results are overwritten by the new ADC results. Each result contains 2 bytes, with the MSB preceded by four leading zeros and the LSB followed by 2 sub-bits. After each falling edge of CS, the oldest available pair of bytes of data is available at DOUT, MSB first. When the FIFO is empty, DOUT is zero.
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MAX1020-MAX1023/MAX1057/MAX1058
AIN0-AIN15 (SINGLE-ENDED), AIN0, AIN2, AIN4-AIN14 (DIFFERENTIAL)
REF1 ACQ AGND CIN+
DAC
COMPARATOR HOLD CINAGND (SINGLE-ENDED), AIN1, AIN3, AIN5-AIN15 (DIFFERENTIAL)
ACQ HOLD ACQ HOLD
AVDD / 2
Figure 2. Equivalent Input Circuit
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10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports MAX1020-MAX1023/MAX1057/MAX1058
The first 2 bytes of data read out after a temperature measurement always contain the 12-bit temperature result, preceded by four leading zeros, MSB first. If another temperature measurement is performed before the first temperature result is read out, the old measurement is overwritten by the new result. Temperature results are in degrees Celsius (two's complement), at a resolution of 8 LSB per degree. See the Temperature Measurements section for details on converting the digital code to a temperature. reference is 2.5V. The MAX1020/MAX1022/MAX1058 internal reference is 4.096V. When using an external reference on any of these devices, the voltage range is 0.7V to AVDD. DAC Transfer Function See Table 2 for various analog outputs from the DAC. DAC Power-On Wake-Up Modes The state of the RES_SEL input determines the wake-up state of the DAC outputs. Connect RES_SEL to AVDD or AGND upon power-up to be sure the DAC outputs wake up to a known state. Connect RES_SEL to AGND to wake up all DAC outputs at 000h. While RES_SEL is low, the 100k internal resistor pulls the DAC outputs to AGND and the output buffers are powered down. Connect RES_SEL to AVDD to wake up all DAC outputs at FFFh. While RES_SEL is high, the 100k pullup resistor pulls the DAC outputs to VREF1 and the output buffers are powered down. DAC Power-Up Modes See Table 21 for a description of the DAC power-up and power-down modes.
10-Bit DAC
In addition to the 10-bit ADC, the MAX1020-MAX1023/ MAX1057/MAX1058 also include eight voltage-output, 10-bit, monotonic DACs with less than 4 LSB integral nonlinearity error and less than 1 LSB differential nonlinearity error. Each DAC has a 2s settling time and ultra-low glitch energy (4nV*s). The 10-bit DAC code is unipolar binary with 1 LSB = VREF / 4096. DAC Digital Interface Figure 1 shows the functional diagram of the MAX1057/ MAX1058. The shift register converts a serial 16-bit word to parallel data for each input register operating with a clock rate up to 25MHz. The SPI-compatible digital interface to the shift register consists of CS, SCLK, DIN, and DOUT. Serial data at DIN is loaded on the falling edge of SCLK. Pull CS low to begin a write sequence. Begin a write to the DAC by writing 0001XXXX as a command byte. The last 4 bits of the DAC select register are don't-care bits. See Table 10. Write another 2 bytes to the DAC interface register following the command byte to select the appropriate DAC and the data to be written to it. See Tables 20 and 21. The eight double-buffered DACs include an input and a DAC register. The input registers are directly connected to the shift register and hold the result of the most recent write operation. The eight 10-bit DAC registers hold the current output code for the respective DAC. Data can be transferred from the input registers to the DAC registers by pulling LDAC low or by writing the appropriate DAC command sequence at DIN. See Table 20. The outputs of the DACs are buffered through eight rail-to-rail op amps. The MAX1020-MAX1023/MAX1057/MAX1058 DAC output-voltage range is based on the internal reference or an external reference. Write to the setup register (see Table 5) to program the reference. If using an external voltage reference, bypass REF1 with a 0.1F capacitor to AGND. The MAX1021/MAX1023/MAX1057 internal
GPIOs
In addition to the internal ADC and DAC, the MAX1057/MAX1058 also provide 12 general-purpose input/output channels, GPIOA0-GPIOA3, GPIOB0-
Table 2. DAC Output Code Table
DAC CONTENTS MSB 11 1111 LSB 1111 ANALOG OUTPUT
1023 + VREF 1024 513 + VREF 1024 512 + VREF + VREF = 1024 2 511 + VREF 1024 1 + VREF 1024
0
10
0000
0001
10
0000
0000
01
0111
0111
00 00
0000 0000
0001 0000
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10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports
GPIOB3, and GPIOC0-GPIOC3. The MAX1020/MAX1021 include four GPIO channels (GPIOA0, GPIOA1, GPIOC0, GPIOC1). Read and write to the GPIOs as detailed in Table 1 and Tables 12-19. Also, see the GPIO Command section. See Figures 11 and 12 for GPIO timing. Write to the GPIOs by writing a command byte to the GPIO command register. Write a single data byte to the MAX1020/MAX1021 following the command byte. Write 2 bytes to the MAX1057/MAX1058 following the command byte. The GPIOs can sink and source current. The MAX1057/MAX1058 GPIOA0-GPIOA3 can sink and source up to 15mA. GPIOB0-GPIOB3 and GPIOC0- GPIOC3 can sink 4mA and source 2mA. The MAX1020/ MAX1021 GPIOA0 and GPIOA1 can sink and source up to 15mA. The MAX1020/MAX1021 GPIOC0 and GPIOC1 can sink 4mA and source 2mA. See Table 3. When using REF1 or REF2/AIN_ in external-reference mode, connect a 0.1F capacitor to AGND. Set REFSEL[1:0] = 01 to program the ADC and DAC for external-reference mode. The DAC uses REF1 as its external reference, while the ADC uses REF2 as its external reference. Set REFSEL[1:0] = 11 to program the ADC for external differential reference mode. REF1 is the positive reference and REF2 is the negative reference in the ADC external differential mode. When REFSEL [1:0] = 00 or 10, REF2/AIN_ functions as an analog input channel. When REFSEL [1:0] = 01 or 11, REF2/AIN_ functions as the device's negative reference.
MAX1020-MAX1023/MAX1057/MAX1058
Temperature Measurements
Issue a command byte setting bit 0 of the conversion register to one to take a temperature measurement. See Table 4. The MAX1020-MAX1023/MAX1057/ MAX1058 perform temperature measurements with an internal diode-connected transistor. The diode bias current changes from 68A to 4A to produce a temperature-dependent bias voltage difference. The second conversion result at 4A is subtracted from the first at 68A to calculate a digital value that is proportional to absolute temperature. The output data appearing at DOUT is the digital code above, minus an offset to adjust from Kelvin to Celsius. The reference voltage used for the temperature measurements is always derived from the internal reference source to ensure that 1 LSB corresponds to 1/8 of a degree Celsius. On every scan where a temperature measurement is requested, the temperature conversion is carried out first. The first 2 bytes of data read from the FIFO contain the result of the temperature measurement. If another temperature measurement is performed before the first temperature result is read out, the old measurement is overwritten by the new result. Temperature results are in degrees Celsius (two's complement). See the Applications Information section for information on how to perform temperature measurements in each clock mode.
Clock Modes
Internal Clock The MAX1020-MAX1023/MAX1057/MAX1058 can operate from an internal oscillator. The internal oscillator is active in clock modes 00, 01, and 10. Figures 6, 7, and 8 show how to start an ADC conversion in the three internally timed conversion modes. Read out the data at clock speeds up to 25MHz through the SPI interface. External Clock Set CKSEL1 and CKSEL0 in the setup register to 11 to set up the interface for external clock mode 11. See Table 5. Pulse SCLK at speeds from 0.1MHz to 4.8MHz. Write to SCLK with a 40% to 60% duty cycle. The SCLK frequency controls the conversion timing. See Figure 9 for clock mode 11 timing. See the ADC Conversions in Clock Mode 11 section.
ADC/DAC References
Address the reference through the setup register, bits 3 and 2. See Table 5. Following a wake-up delay, set REFSEL[1:0] = 00 to program both the ADC and DAC for internal reference use. Set REFSEL[1:0] = 10 to program the ADC for internal reference. Set REFSEL[1:0] = 10 to program the DAC for external reference, REF1.
Register Descriptions
The MAX1020-MAX1023/MAX1057/MAX1058 communicate between the internal registers and the external
Table 3. GPIO Maximum Sink/Source Current
CURRENT SINK CURRENT SOURCE CURRENT MAX1057/MAX1058 GPIOA0-GPIOA3 15mA 15mA GPIOB0-GPIOB3 4mA 2mA GPIOC0-GPIOC3 4mA 2mA MAX1020/MAX1021 GPIOA0, GPIOA1 15mA 15mA GPIOC0, GPIOC1 4mA 2mA
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10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports MAX1020-MAX1023/MAX1057/MAX1058
circuitry through the SPI-compatible serial interface. Table 1 details the command byte, the registers, and the bit names. Tables 4-12 show the various functions within the conversion register, setup register, unipolarmode register, bipolar-mode register, ADC averaging register, DAC select register, reset register, and GPIO command register, respectively. Conversion Register Select active analog input channels, scan modes, and a single temperature measurement per scan by issuing a command byte to the conversion register. Table 4 details channel selection, the four scan modes, and how to request a temperature measurement. Start a scan by writing to the conversion register when in clock mode 10 or 11, or by applying a low pulse to the CNVST pin when in clock mode 00 or 01. See Figures 6 and 7 for timing specifications for starting a scan with CNVST. A conversion is not performed if it is requested on a channel or one of the channel pairs that has been configured as CNVST or REF2. For channels configured as differential pairs, the CHSEL0 bit is ignored and the two pins are treated as a single differential channel. Select scan mode 00 or 01 to return one result per single-ended channel and one result per differential pair within the selected scanning range (set by bits 2 and 1, SCAN1 and SCAN0), plus one temperature result if selected. Select scan mode 10 to scan a single input channel numerous times, depending on NSCAN1 and NSCAN0 in the ADC averaging register (Table 9). Select scan mode 11 to return only one result from a single channel. Setup Register Issue a command byte to the setup register to configure the clock, reference, power-down modes, and ADC single-ended/differential modes. Table 5 details the bits in the setup-register command byte. Bits 5 and 4 (CKSEL1 and CKSEL0) control the clock mode, acquisition and sampling, and the conversion start. Bits 3 and 2 (REFSEL1 and REFSEL0) set the device for either internal or external reference. Bits 1 and 0 (DIFFSEL1 and DIFFSEL0) address the ADC unipolar-mode and bipolar-mode registers and configure the analog-input channels for differential operation. The ADC reference is always on if any of the following conditions are true:
Table 4. Conversion Register*
BIT NAME -- CHSEL3 CHSEL2 CHSEL1 CHSEL0 SCAN1 SCAN0 BIT 7 (MSB) 6 5 4 3 2 1 FUNCTION Set to one to select conversion register. Analog-input channel select. Analog-input channel select. Analog-input channel select. Analog-input channel select. Scan-mode select. Scan-mode select. Set to one to take a single temperature measurement. The first conversion result of a scan contains temperature information.
TEMP
0 (LSB)
*See below for bit details.
SELECTED CHANNEL (N) AIN0 AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 AIN7 AIN8 AIN9 AIN10 AIN11 AIN12 AIN13 AIN14 AIN15
CHSEL3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
CHSEL2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1
CHSEL1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1
CHSEL0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
SCAN1 0 0
SCAN0 0 1
SCAN MODE (CHANNEL N IS SELECTED BY BITS CHSEL3-CHSEL0) Scans channels 0 through N. Scans channels N through the highest numbered channel. Scans channel N repeatedly. The ADC averaging register sets the number of results. No scan. Converts channel N once only.
1 1
0 1
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10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports
Table 5. Setup Register*
BIT NAME -- -- CKSEL1 CKSEL0 REFSEL1 REFSEL0 DIFFSEL1 DIFFSEL0 BIT 7 (MSB) 6 5 4 3 2 1 0 (LSB) Set to zero to select setup register. Set to one to select setup register. Clock mode and CNVST configuration; resets to one at power-up. Clock mode and CNVST configuration. Reference-mode configuration. Reference-mode configuration. Unipolar-/bipolar-mode register configuration for differential mode. Unipolar-/bipolar-mode register configuration for differential mode. FUNCTION
MAX1020-MAX1023/MAX1057/MAX1058
*See below for bit details.
Table 5a. Clock Modes (see the Clock Mode section)
CKSEL1 0 0 1 1 CKSEL0 0 1 0 1 CONVERSION CLOCK Internal Internal Internal External (4.8MHz max) ACQUISITION/SAMPLING Internally timed. Externally timed by CNVST. Internally timed. Externally timed by SCLK. CNVST CONFIGURATION CNVST CNVST AIN15/AIN11/AIN7 AIN15/AIN11/AIN7
Table 5b. Clock Modes 00, 01, and 10
REFSEL1 REFSEL0 VOLTAGE REFERENCE OVERRIDE CONDITIONS AIN 0 0 Internal (DAC and ADC) Temperature External singleended (REF1 for DAC and REF2 for ADC) AIN Temperature AUTOSHUTDOWN Internal reference turns off after scan is complete. If internal reference is turned off, there is a programmed delay of 218 internal-conversion clock cycles. AIN14/AIN10/AIN6 Internal reference required. There is a programmed delay of 244 internal-conversion clock cycles for the internal reference to settle after wake-up. Internal reference not used. Internal reference required. There is a programmed delay of 244 internal-conversion clock cycles for the internal reference to settle after wake-up. Default reference mode. Internal reference turns off after scan is complete. If internal reference is turned off, there is a programmed delay of 218 internalconversion clock cycles. Internal reference required. There is a programmed delay of 244 internal-conversion clock cycles for the internal reference to settle after wake-up. Internal reference not used. Internal reference required. There is a programmed delay of 244 internal-conversion clock cycles for the internal reference to settle after wake-up. REF2 REF2 REF2 CONFIGURATION
0
1
AIN 1 0 Internal (ADC) and external REF1 (DAC) Temperature AIN Temperature
AIN14/AIN10/AIN6
1
1
External differential (ADC), external REF1 (DAC)
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10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports MAX1020-MAX1023/MAX1057/MAX1058
1)The FBGON bit is set to one in the reset register. 2)At least one DAC output is powered up and REFSEL[1:0] (in the setup register) = 00. 3)At least one DAC is powered down through the 100k to VREF and REFSEL[1:0] = 00. If any of the above conditions exist, the ADC reference is always on, but there is a 188 clock-cycle delay before temperature-sensor measurements begin, if requested.
Table 5c. Clock Mode 11
REFSEL1 REFSEL0 VOLTAGE REFERENCE OVERRIDE CONDITIONS AIN 0 0 Internal (DAC and ADC) Temperature AUTOSHUTDOWN Internal reference turns off after scan is complete. If internal reference is turned off, there is a programmed delay of 218 external conversion clock cycles. Internal reference required. There is a programmed delay of 244 external conversion clock cycles for the internal reference. Temperature-sensor output appears at DOUT after 188 further external clock cycles. Internal reference not used. Internal reference required. There is a programmed delay of 244 external conversion clock cycles for the internal reference. Temperature-sensor output appears at DOUT after 188 further external clock cycles. Default reference mode. Internal reference turns off after scan is complete. If internal reference is turned off, there is a programmed delay of 218 external conversion clock cycles. AIN14/AIN10/AIN6 Temperature Internal reference required. There is a programmed delay of 244 external conversion clock cycles for the internal reference. Temperature-sensor output appears at DOUT after 188 further external clock cycles. Internal reference not used. Internal reference required. There is a programmed delay of 244 external conversion clock cycles for the internal reference. Temperature-sensor output appears at DOUT after 188 further external clock cycles. REF2 REF2 AIN14/AIN10/AIN6 REF2 CONFIGURATION
AIN 0 1 External singleended (REF1 for DAC and REF2 for ADC)
Temperature
AIN 1 0 Internal (ADC) and external REF1 (DAC)
AIN 1 1 External differential (ADC), external REF1 (DAC)
Temperature
Table 5d. Differential Select Modes
DIFFSEL1 DIFFSEL0 0 0 1 1 0 1 0 1 FUNCTION No data follows the command setup byte. Unipolar-mode and bipolar-mode registers remain unchanged. No data follows the command setup byte. Unipolar-mode and bipolar-mode registers remain unchanged. 1 byte of data follows the command setup byte and is written to the unipolar-mode register. 1 byte of data follows the command setup byte and is written to the bipolar-mode register.
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10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports
Table 6. Unipolar-Mode Register (Addressed Through the Setup Register)
BIT NAME UCH0/1 UCH2/3 UCH4/5 UCH6/7 UCH8/9 UCH10/11 UCH12/13 UCH14/15 BIT 7 (MSB) 6 5 4 3 2 1 0 (LSB) FUNCTION Configure AIN0 and AIN1 for unipolar differential conversion. Configure AIN2 and AIN3 for unipolar differential conversion. Configure AIN4 and AIN5 for unipolar differential conversion. Configure AIN6 and AIN7 for unipolar differential conversion. Configure AIN8 and AIN9 for unipolar differential conversion. Configure AIN10 and AIN11 for unipolar differential conversion. Configure AIN12 and AIN13 for unipolar differential conversion. Configure AIN14 and AIN15 for unipolar differential conversion.
MAX1020-MAX1023/MAX1057/MAX1058
Table 7. Bipolar-Mode Register (Addressed Through the Setup Register)
BIT NAME BCH0/1 BIT 7 (MSB) FUNCTION Set to one to configure AIN0 and AIN1 for bipolar differential conversion. Set the corresponding bits in the unipolar-mode and bipolar-mode registers to zero to configure AIN0 and AIN1 for unipolar single-ended conversion. Set to one to configure AIN2 and AIN3 for bipolar differential conversion. Set the corresponding bits in the unipolar-mode and bipolar-mode registers to zero to configure AIN2 and AIN3 for unipolar single-ended conversion. Set to one to configure AIN4 and AIN5 for bipolar differential conversion. Set the corresponding bits in the unipolar-mode and bipolar-mode registers to zero to configure AIN4 and AIN5 for unipolar single-ended conversion. Set to one to configure AIN6 and AIN7 for bipolar differential conversion. Set the corresponding bits in the unipolar-mode and bipolar-mode registers to zero to configure AIN6 and AIN7 for unipolar single-ended conversion. Set to one to configure AIN8 and AIN9 for bipolar differential conversion. Set the corresponding bits in the unipolar-mode and bipolar-mode registers to zero to configure AIN8 and AIN9 for unipolar single-ended conversion. Set to one to configure AIN10 and AIN11 for bipolar differential conversion. Set the corresponding bits in the unipolar-mode and bipolar-mode registers to zero to configure AIN10 and AIN11 for unipolar single-ended conversion. Set to one to configure AIN12 and AIN13 for bipolar differential conversion. Set the corresponding bits in the unipolar-mode and bipolar-mode registers to zero to configure AIN12 and AIN13 for unipolar single-ended conversion. Set to one to configure AIN14 and AIN15 for bipolar differential conversion. Set the corresponding bits in the unipolar-mode and bipolar-mode registers to zero to configure AIN14 and AIN15 for unipolar single-ended conversion.
BCH2/3
6
BCH4/5
5
BCH6/7
4
BCH8/9
3
BCH10/11
2
BCH12/13
1
BCH14/15
0 (LSB)
______________________________________________________________________________________
27
10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports MAX1020-MAX1023/MAX1057/MAX1058
Unipolar/Bipolar Registers The final 2 bits (LSBs) of the setup register control the unipolar-/bipolar-mode address registers. Set DIFFSEL[1:0] = 10 to write to the unipolar-mode register. Set bits DIFFSEL[1:0] = 11 to write to the bipolarmode register. In both cases, the setup command byte must be followed by 1 byte of data that is written to the unipolar-mode register or bipolar-mode register. Hold CS low and run 16 SCLK cycles before pulling CS high. If the last 2 bits of the setup register are 00 or 01, neither the unipolar-mode register nor the bipolar-mode register is written. Any subsequent byte is recognized as a new command byte. See Tables 6, 7, and 8 to program the unipolar- and bipolar-mode registers. Both registers power up at all zeros to set the inputs as 16 unipolar single-ended channels. To configure a channel pair as single-ended unipolar, bipolar differential, or unipolar differential, see Table 8. In unipolar mode, AIN+ can exceed AIN- by up to VREF. The output format in unipolar mode is binary. In bipolar mode, either input can exceed the other by up to VREF/2. The output format in bipolar mode is two's complement (see the ADC Transfer Functions section). ADC Averaging Register Write a command byte to the ADC averaging register to configure the ADC to average up to 32 samples for each requested result, and to independently control the number of results requested for single-channel scans.
Table 8. Unipolar/Bipolar Channel Function
UNIPOLARMODE REGISTER BIT 0 0 1 1 BIPOLAR-MODE REGISTER BIT 0 1 0 1 CHANNEL PAIR FUNCTION Unipolar single-ended Bipolar differential Unipolar differential Unipolar differential
Table 9. ADC Averaging Register*
BIT NAME -- -- -- AVGON NAVG1 NAVG0 NSCAN1 NSCAN0 BIT 7 (MSB) 6 5 4 3 2 1 0 (LSB) FUNCTION Set to zero to select ADC averaging register. Set to zero to select ADC averaging register. Set to one to select ADC averaging register. Set to one to turn averaging on. Set to zero to turn averaging off. Configures the number of conversions for single-channel scans. Configures the number of conversions for single-channel scans. Single-channel scan count. (Scan mode 10 only.) Single-channel scan count. (Scan mode 10 only.)
*See below for bit details.
AVGON 0 1 1 1 1 NAVG1 X 0 0 1 1 NAVG0 X 0 1 0 1 FUNCTION Performs one conversion for each requested result. Performs four conversions and returns the average for each requested result. Performs eight conversions and returns the average for each requested result. Performs 16 conversions and returns the average for each requested result. Performs 32 conversions and returns the average for each requested result.
NSCAN1 0 0 1 1
NSCAN0 0 1 0 1
FUNCTION (APPLIES ONLY IF SCAN MODE 10 IS SELECTED) Scans channel N and returns four results. Scans channel N and returns eight results. Scans channel N and returns 12 results. Scans channel N and returns 16 results.
28
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10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports
Table 9 details the four scan modes available in the ADC conversion register. All four scan modes allow averaging as long as the AVGON bit, bit 4 in the averaging register, is set to 1. Select scan mode 10 to scan the same channel multiple times. Clock mode 11 disables averaging. For example, if AVGON = 1, NAVG[1:0] = 00, NSCAN [1:0] = 11 and SCAN [1:0] = 10, 16 results are written to the FIFO, with each result being the average of four conversions of channel N. DAC Select Register Write a command byte 0001XXXX to the DAC select register (as shown in Table 9) to set up the DAC interface and indicate that another word will follow. The last 4 bits of the DAC select register are don't-care bits. The word that follows the DAC select-register command byte controls the DAC serial interface. See Table 20 and the DAC Serial Interface section. Reset Register Write to the reset register (as shown in Table 11) to clear the FIFO or to reset all registers to their default states. Set the RESET bit to one to reset the FIFO. Set the RESET bit to zero to return the MAX1020-MAX1023/ MAX1057/MAX1058 to their default power-up state. All registers power up in state 00000000, except for the setup register that powers up in clock mode 10 (CKSEL1 = 1). Set the SLOW bit to one to add a 15ns delay in the DOUT signal path to provide a longer hold time. Writing a one to the SLOW bit also clears the contents of the FIFO. Set the FBGON bit to one to force the bias block and bandgap reference to power up regardless of the state of the DAC and activity of the ADC block. Setting the FBGON bit high also removes the programmed wake-up delay between conversions in clock modes 01 and 11. Setting the FBGON bit high also clears the FIFO. GPIO Command Write a command byte to the GPIO command register to configure, write, or read the GPIOs, as detailed in Table 12. Write the command byte 00000011 to configure the GPIOs. The eight SCLK cycles following the command byte load data from DIN to the GPIO configuration register in the MAX1020/MAX1021. The 16 SCLK cycles
MAX1020-MAX1023/MAX1057/MAX1058
Table 10. DAC Select Register
BIT NAME -- -- -- -- X X X X BIT FUNCTION
7 (MSB) Set to zero to select DAC select register. 6 5 4 3 2 1 0 Set to zero to select DAC select register. Set to zero to select DAC select register. Set to one to select DAC select register. Don't care. Don't care. Don't care. Don't care.
Table 12. GPIO Command Register
BIT NAME -- -- -- BIT 7 (MSB) 6 5 4 3 2 1 0 (LSB) GPIOSEL2 1 FUNCTION Set to zero to select GPIO register. Set to zero to select GPIO register. Set to zero to select GPIO register. Set to zero to select GPIO register. Set to zero to select GPIO register. Set to zero to select GPIO register. GPIO configuration bit. GPIO write bit. FUNCTION GPIO configuration; written data is entered in the GPIO configuration register. GPIO write; written data is entered in the GPIO write register. GPIO read; the next 8/16 SCLK cycles transfer the state of all GPIO drivers into DOUT.
Table 11. Reset Register
BIT NAME -- -- -- -- -- RESET SLOW FBGON BIT FUNCTION
-- -- -- GPIOSEL1 GPIOSEL2 GPIOSEL1 1
7 (MSB) Set to zero to select ADC reset register. 6 5 4 3 2 1 0 (LSB) Set to zero to select ADC reset register. Set to zero to select ADC reset register. Set to zero to select ADC reset register. Set to one to select ADC reset register. Set to zero to clear the FIFO only. Set to one to set the device in its power-on condition. Set to one to turn on slow mode. Set to one to force internal bias block and bandgap reference to be always powered up.
1
0
0
1
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29
10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports MAX1020-MAX1023/MAX1057/MAX1058
following the command byte load data from DIN to the GPIO configuration register in the MAX1057/MAX1058. See Tables 13 and 14. The register bits are updated after the last CS rising edge. All GPIOs default to inputs upon power-up. The data in the register controls the function of each GPIO, as shown in Tables 13-19. GPIO Write Write the command byte 00000010 to indicate a GPIO write operation. The eight SCLK cycles following the command byte load data from DIN into the GPIO write register in the MAX1020/MAX1021. The 16 SCLK cycles following the command byte load data from DIN into the GPIO write register in the MAX1057/MAX1058. See Tables 15 and 16. The register bits are updated after the last CS rising edge.
Table 13. MAX1020/MAX1021 GPIO Configuration
DATA PIN DIN DOUT 0 0 GPIO COMMAND BYTE 0 0 0 0 0 0 0 0 0 0 1 0 1 0 GPIOC1 0 GPIOC0 0 DATA BYTE GPIOA1 0 GPIOA0 0 X 0 X 0 X 0 X 0
Table 14. MAX1057/MAX1058 GPIO Configuration
DATA PIN GPIO COMMAND BYTE GPIOC3 GPIOC2 DATA BYTE 1 GPIOC1 GPIOC0 GPIOB3 GPIOB2 GPIOB1 GPIOB0 GPIOA3 GPIOA2 DATA BYTE 2 GPIOA1 GPIOA0
DIN
0
0
0
0
0
0
1
1
X
X
X
X
DOUT
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Table 15. MAX1020/MAX1021 GPIO Write
DATA PIN DIN DOUT 0 0 0 0 GPIO COMMAND BYTE 0 0 0 0 0 0 0 0 1 0 0 0 GPIOC1 0 GPIOC0 0 DATA BYTE GPIOA1 0 GPIOA0 0 X 0 X 0 X 0 X 0
Table 16. MAX1057/MAX1058 GPIO Write
DATA PIN GPIO COMMAND BYTE GPIOC3 GPIOC2 DATA BYTE 1 GPIOC1 GPIOC0 GPIOB3 GPIOB2 GPIOB1 GPIOB0 GPIOA3 GPIOA2 DATA BYTE 2 GPIOA1 GPIOA0
DIN
0
0
0
0
0
0
1
0
X
X
X
X
DOUT
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
30
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10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports
GPIO Read Write the command byte 00000001 to indicate a GPIO read operation. The eight SCLK cycles following the command byte transfer the state of the GPIOs to DOUT in the MAX1020/MAX1021. The 16 SCLK cycles following the command byte transfer the state of the GPIOs to DOUT in the MAX1057/MAX1058. See Tables 18 and 19. DAC Serial Interface Write a command byte 0001XXXX to the DAC select register to indicate the word to follow is written to the DAC serial interface, as detailed in Tables 1, 10, 20, and 21. Write the next 16 bits to the DAC interface register, as shown in Tables 20 and 21. Following the high-to-low transition of CS, the data is shifted synchronously and latched into the input register on each falling edge of SCLK. Each word is 16 bits. The first 4 bits are the control bits followed by 10 data bits (MSB first) and 2 don'tcare sub-bits. See Figures 9-12 for DAC timing specifications. If CS goes high prior to completing 16 SCLK cycles, the command is discarded. To initiate a new transfer, drive CS low again. For example, writing the DAC serial interface word 1111 0000 and 1111 0100 disconnects DAC outputs 4 through 7 and forces them to a high-impedance state. DAC outputs 0 through 3 remain in their previous state.
MAX1020-MAX1023/MAX1057/MAX1058
Table 17. GPIO-Mode Control
CONFIGURATION BIT 1 1 0 0 WRITE BIT 1 0 1 0 OUTPUT STATE 1 0 Tri-state 0 GPIO FUNCTION Output Output Input Pulldown (open drain)
Table 18. MAX1020/MAX1021 GPIO Read
DATA PIN DIN DOUT 0 0 GPIO COMMAND BYTE 0 0 0 0 0 0 0 0 0 0 0 0 1 0 X 0 X 0 X 0 X 0 X GPIOC1 DATA BYTE X GPIOC0 X GPIOA1 X GPIOA0
Table 19. MAX1057/MAX1058 GPIO Read
DATA PIN DIN 0 GPIO COMMAND BYTE 0 0 0 0 0 0 1 X X X DATA BYTE 1 X X GPIOC3 X GPIOC2 X GPIOC1 X GPIOC0 X GPIOB3 X GPIOB2 X GPIOB1 DATA BYTE 2 X GPIOB0 X GPIOA3 X GPIOA2 X GPIOA1 X GPIOA0
DOUT
0
0
0
0
0
0
0
0
0
0
0
0
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10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports MAX1020-MAX1023/MAX1057/MAX1058
Table 20. DAC Serial-Interface Configuration
16-BIT SERIAL WORD MSB CONTROL BITS 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 1 1 1 1 0 0 0 0 0 1 1 0 0 1 1 0 0 0 1 1 0 1 0 1 0 1 0 1 X 0 1 -- -- -- -- -- -- -- -- X X X -- -- -- -- -- -- -- -- X X X -- -- -- -- -- -- -- -- X X X -- -- -- -- -- -- -- -- X X X -- -- -- -- -- -- -- -- DATA BITS X X X X X X X X X X X X X X X X X X X X X X X X NOP RESET Pull-High DAC0 DAC1 DAC2 DAC3 DAC4 DAC5 DAC6 DAC7 No operation. Reset all internal registers to 000h and leave output buffers in their present state. Preset all internal registers to FFFh and leave output buffers in their present state. D9-D0 to input register 0, DAC output unchanged. D9-D0 to input register 1, DAC output unchanged. D9-D0 to input register 2, DAC output unchanged. D9-D0 to input register 3, DAC output unchanged. D9-D0 to input register 4, DAC output unchanged. D9-D0 to input register 5, DAC output unchanged. D9-D0 to input register 6, DAC output unchanged. D9-D0 to input register 7, DAC output unchanged. D9-D0 to input registers 0-3 and DAC registers 0-3. DAC outputs updated (write-through). D9-D0 to input registers 4-7 and DAC registers 5-8. DAC outputs updated (write-through). D9-D0 to input registers 0-7 and DAC Registers 0-7. DAC outputs updated (write-through). D9-D0 to input registers 0-7. DAC outputs unchanged. Input registers to DAC registers indicated by ones, DAC outputs updated, equivalent to software LDAC. (No effect on DACs indicated by zeros.) LSB DESCRIPTION FUNCTION
C3 C2 C1 C0 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 X X X -- -- -- -- -- -- -- -- X X X -- -- -- -- -- -- -- -- X X X -- -- -- -- -- -- -- -- X X X -- -- -- -- -- -- -- -- X X X -- -- -- -- -- -- -- --
1
0
1
0
--
--
--
--
--
--
--
--
--
--
X
X
DAC0-DAC3
1
0
1
1
--
--
--
--
--
--
--
--
--
--
X
X
DAC4-DAC7
1
1
0
0
--
--
--
--
--
--
--
--
--
--
X
X
DAC0-DAC7
1
1
0
1
--
--
--
--
--
--
--
--
--
--
X
X
DAC0-DAC7
DAC7
DAC6
DAC5
DAC4
DAC3
DAC2
DAC1
1
1
1
0
DAC0
X
X
X
X
DAC0-DAC7
32
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10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports
Table 21. DAC Power-Up and Power-Down Commands
CONTROL BITS DAC7 DAC6 DAC5 DAC4 C3 C2 C1 C0 DATA BITS DAC3 DAC2 DAC1 DAC0 DESCRIPTION D3 D2 D1 D0 FUNCTION
MAX1020-MAX1023/MAX1057/MAX1058
1
1
1
1
----------------0
0
1
X
Power-Up
Power up individual DAC buffers indicated by data in DAC0 through DAC7. A one indicates the DAC output is connected and active. A zero does not affect the DAC's present state.
1
1
1
1
----------------0
1
0
X
Power down individual DAC buffers indicated by data in DAC0 through DAC7. A one indicates the Power-Down 1 DAC output is disconnected and high impedance. A zero does not affect the DAC's present state. Power down individual DAC buffers indicated by data in DAC0 through DAC7. A one indicates the Power-Down 2 DAC output is disconnected and pulled to AGND with a 1k resistor. A zero does not affect the DAC's present state. Power down individual DAC buffers indicated by data in DAC0 through DAC7. A one indicates the Power-Down 3 DAC output is disconnected and pulled to AGND with a 100k resistor. A zero does not affect the DAC's present state. Power down individual DAC buffers indicated by data in DAC0 through DAC7. A one indicates the Power-Down 4 DAC output is disconnected and pulled to REF1 with a 100k resistor. A zero does not affect the DAC's present state.
1
1
1
1
----------------1
0
0
X
1
1
1
1
----------------0
0
0
X
1
1
1
1
----------------1
1
1
X
Output-Data Format
Figures 6-9 illustrate the conversion timing for the MAX1020-MAX1023/MAX1057/MAX1058. All 10-bit conversion results are output in 2-byte format, MSB first, with four leading zeros and with the LSB followed by 2 sub-bits. Data appears on DOUT on the falling edges of SCLK. Data is binary for unipolar mode and two's complement for bipolar mode and temperature results. See Figures 3, 4, and 5 for input/output and temperature-transfer functions.
ADC Transfer Functions
Figure 3 shows the unipolar transfer function for singleended or differential inputs. Figure 4 shows the bipolar
transfer function for differential inputs. Code transitions occur halfway between successive-integer LSB values. Output coding is binary, with 1 LSB = VREF1 / 1024 (MAX1021/MAX1023/MAX1057) and 1 LSB = VREF1 / 1024 (MAX1020/MAX1022/MAX1058) for unipolar and bipolar operation, and 1 LSB = +0.125C for temperature measurements. Bipolar true-differential results and temperature-sensor results are available in two's complement format, while all others are in binary. See Tables 6, 7, and 8 for details on which setting (unipolar or bipolar) takes precedence. In unipolar mode, AIN+ can exceed AIN- by up to VREF1. In bipolar mode, either input can exceed the other by up to VREF1 / 2.
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33
10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports MAX1020-MAX1023/MAX1057/MAX1058
Partial Reads and Partial Writes
If the first byte of an entry in the FIFO is partially read (CS is pulled high after fewer than eight SCLK cycles), the remaining bits are lost for that byte. The next byte of data that is read out contains the next 8 bits. If the first byte of an entry in the FIFO is read out fully, but the second byte is read out partially, the rest of that byte is lost. The remaining data in the FIFO is unaffected and can be read out normally after taking CS low again, as long as the 4 leading bits (normally zeros) are ignored. If CS is pulled low before EOC goes low, a conversion may not be completed and the FIFO data may not be correct. Incorrect writes (pulling CS high before completing eight SCLK cycles) are ignored and the register remains unchanged. MAX1057/MAX1058 then wake up, scan all requested channels, store the results in the FIFO, and shut down. After the scan is complete, EOC is pulled low and the results are available in the FIFO. Wait until EOC goes low before pulling CS low to communicate with the serial interface. EOC stays low until CS or CNVST is pulled low again. A temperature-conversion result, if requested, precedes all other FIFO results. Temperature results are available in 12-bit format.
VREF = VREF+ - VREFVREF 011....111 OFFSET BINARY OUTPUT CODE (LSB) 011....110 011....101 FS = VREF / 2 + VCOM ZS = COM -FS = -VREF / 2 1 LSB = VREF / 1024 000....001 000....000 111....111 100....011 100....010 100....001 100....000 -FS -1 0 +1 (COM) INPUT VOLTAGE (LSB) +FS - 1 LSB VREF (COM) VREF VREF
Applications Information
Internally Timed Acquisitions and Conversions Using CNVST
ADC Conversions in Clock Mode 00 In clock mode 00, the wake-up, acquisition, conversion, and shutdown sequence is initiated through CNVST and performed automatically using the internal oscillator. Results are added to the internal FIFO to be read out later. See Figure 6 for clock mode 00 timing after a command byte is issued. See Table 5 for details on programming the clock mode in the setup register. Initiate a scan by setting CNVST low for at least 40ns before pulling it high again. The MAX1020-MAX1023/
Figure 4. Bipolar Transfer Function--Full Scale (FS) = VREF / 2
OUTPUT CODE 111....111 OFFSET BINARY OUTPUT CODE (LSB) 111....110 111....101 FS = VREF 1 LSB = VREF / 1024 000....010 000....001 000....000 111....111 000....011 000....010 000....001 000....000 0123 INPUT VOLTAGE (LSB) FS - 3/2 LSB -256 0 TEMPERATURE (C) +255.5 FS 100....001 100....000 111....110 111....101 FULL-SCALE TRANSITION 011....111 011....110
Figure 3. Unipolar Transfer Function--Full Scale (FS) = VREF 34
Figure 5. Temperature Transfer Function
______________________________________________________________________________________
10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports MAX1020-MAX1023/MAX1057/MAX1058
CNVST (UP TO 514 INTERNALLY CLOCKED ACQUISITIONS AND CONVERSIONS) CS
SCLK
DOUT MSB1 tRDS EOC LSB1 MSB2
Figure 6. Clock Mode 00--After writing a command byte, set CNVST low for at least 40ns to begin a conversion.
tCSW CNVST (CONVERSION 2) (ACQUISITION 1) CS tDOV SCLK (CONVERSION 1) (ACQUISITION 2)
DOUT MSB1 EOC LSB1 MSB2
Figure 7. Clock Mode 01--After writing a command byte, request multiple conversions by setting CNVST low for each conversion.
Do not issue a second CNVST signal before EOC goes low; otherwise, the FIFO can be corrupted. Wait until all conversions are complete before reading the FIFO. SPI communications to the DAC and GPIO registers are permitted during conversion. However, coupled noise may result in degraded ADC signal-to-noise ratio (SNR).
Externally Timed Acquisitions and Internally Timed Conversions with CNVST
ADC Conversions in Clock Mode 01 In clock mode 01, conversions are requested one at a time using CNVST and performed automatically using the internal oscillator. See Figure 7 for clock mode 01 timing after a command byte is issued. Setting CNVST low begins an acquisition, wakes up the ADC, and places it in track mode. Hold CNVST low for
at least 1.4s to complete the acquisition. If reference mode 00 or 10 is selected, an additional 45s is required for the internal reference to power up. If a temperature measurement is being requested, reference power-up and temperature measurement is internally timed. In this case, hold CNVST low for at least 40s. Set CNVST high to begin a conversion. Sampling is completed approximately 500ns after CNVST goes high. After the conversion is complete, the ADC shuts down and pulls EOC low. EOC stays low until CS or CNVST is pulled low again. Wait until EOC goes low before pulling CS or CNVST low. The number of CNVST signals must equal the number of conversions requested by the scan and averaging registers to correctly update the FIFO. Wait until all conversions are complete before reading the FIFO. SPI communications to the DAC and GPIO registers are permitted during con35
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10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports MAX1020-MAX1023/MAX1057/MAX1058
DIN (CONVERSION BYTE) (UP TO 514 INTERNALLY CLOCKED ACQUISITIONS AND CONVERSIONS) CS SCLK
DOUT tDOV EOC
MSB1
LSB1
MSB2
Figure 8. Clock Mode 10--The command byte to the conversion register begins the acquisition (CNVST is not required).
version. However, coupled noise may result in degraded ADC SNR. If averaging is turned on, multiple CNVST pulses need to be performed before a result is written to the FIFO. Once the proper number of conversions has been performed to generate an averaged FIFO result (as specified to the averaging register), the scan logic automatically switches the analog-input multiplexer to the next requested channel. If a temperature measurement is programmed, it is performed after the first rising edge of CNVST following the command byte written to the conversion register. The temperature-conversion result is available on DOUT once EOC has been pulled low. Temperature results are available in 12-bit format.
Internally Timed Acquisitions and Conversions Using the Serial Interface
ADC Conversions in Clock Mode 10 In clock mode 10, the wake-up, acquisition, conversion, and shutdown sequence is initiated by writing a command byte to the conversion register, and is performed automatically using the internal oscillator. This is the default clock mode upon power-up. See Figure 8 for clock mode 10 timing. Initiate a scan by writing a command byte to the conversion register. The MAX1020-MAX1023/MAX1057/ MAX1058 then power up, scan all requested channels, store the results in the FIFO, and shut down. After the scan is complete, EOC is pulled low and the results are available in the FIFO. If a temperature measurement is requested, the temperature result precedes all other FIFO results. Temperature results are available in 12-bit format. EOC stays low until CS is pulled low again. Wait until all conversions are complete before reading the FIFO. SPI communications to the DAC and GPIO registers are permitted during conversion. However, coupled noise may result in degraded ADC SNR.
36
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10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports MAX1020-MAX1023/MAX1057/MAX1058
DIN (CONVERSION BYTE) (ACQUISITION1) CS SCLK (CONVERSION1) (ACQUISITION2)
DOUT MSB1 EOC LSB1 MSB2
Figure 9. Clock Mode 11--Externally Timed Acquisition, Sampling, and Conversion without CNVST
Externally Clocked Acquisitions and Conversions Using the Serial Interface
ADC Conversions in Clock Mode 11 In clock mode 11, acquisitions and conversions are initiated by writing a command byte to the conversion register and are performed one at a time using the SCLK as the conversion clock. Scanning, averaging and the FIFO are disabled, and the conversion result is available at DOUT during the conversion. Output data is updated on the rising edge of SCLK in clock mode 11. See Figure 9 for clock mode 11 timing. Initiate a conversion by writing a command byte to the conversion register followed by 16 SCLK cycles. If CS is pulsed high between the eighth and ninth cycles, the pulse width must be less than 100s. To continuously convert at 16 cycles per conversion, alternate 1 byte of zeros (NOP byte) between each conversion byte. If 2 NOP bytes follow a conversion byte, the analog cells power down at the end of the second NOP. Set the FBGON bit to one in the reset register to keep the internal bias block powered. If reference mode 00 is requested, or if an external reference is selected but a temperature measurement is being requested, wait 45s with CS high after writing the conversion byte to extend the acquisition and allow the internal reference to power up. To perform a temperature measurement, write 24 bytes (192 cycles) of zeros after the conversion byte. The temperature result appears on DOUT during the last 2 bytes of the 192 cycles. Temperature results are available in 12-bit format.
Conversion-Time Calculations The conversion time for each scan is based on a number of different factors: conversion time per sample, samples per result, results per scan, if a temperature measurement is requested, and if the external reference is in use. Use the following formula to calculate the total conversion time for an internally timed conversion in clock mode 00 and 10 (see the Electrical Characteristics, as applicable): Total conversion time = tCNV x nAVG x nSCAN + tTS + tINT-REF,SU where: tCNV = tDOV, where tDOV is dependent on clock mode and reference mode selected nAVG = samples per result (amount of averaging) nSCAN = number of times each channel is scanned; set to one unless [SCAN1, SCAN0] = 10 t TS = time required for temperature measurement (53.1s); set to zero if temperature measurement is not requested tINT-REF,SU = tWU (external-reference wake-up); if a conversion using the external reference is requested In clock mode 01, the total conversion time depends on how long CNVST is held low or high. Conversion time in externally clocked mode (CKSEL1, CKSEL0 = 11) depends on the SCLK period and how long CS is held high between each set of eight SCLK cycles. In clock mode 01, the total conversion time does not include the time required to turn on the internal reference.
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37
10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports MAX1020-MAX1023/MAX1057/MAX1058
tCH
tCL
SCLK
1 tDH
2
3
4
5
32 16 8
tDS
DIN
D15
D14
D13 tDOT
D12
D11
D1
D0
tDOE D15 D7 tCSS tCSPWH D14 D6
tDOD
DOUT
D13 D5
D12 D4
D1
D0
tCSH
CS
Figure 10. DAC/GPIO Serial-Interface Timing (Clock Modes 00, 01, and 10)
DAC/GPIO Timing Figures 10-13 detail the timing diagrams for writing to the DAC and GPIOs. Figure 10 shows the timing specifications for clock modes 00, 01, and 10. Figure 11 shows the timing specifications for clock mode 11. Figure 12 details the timing specifications for the DAC input select register and 2 bytes to follow. Output data
is updated on the rising edge of SCLK in clock mode 11. Figure 13 shows the GPIO timing. Figure 14 shows the timing details of a hardware LDAC command DACregister update. For a software-command DAC-register update, tS is valid from the rising edge of CS, which follows the last data bit in the software command word.
38
______________________________________________________________________________________
10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports MAX1020-MAX1023/MAX1057/MAX1058
tCH tCL
SCLK
1
2
3
4
5
32 16 8
tDH tDS
DIN
D15
D14
D13
D12
D11
D1
D0
tDOE tDOT D15 D7 tCSS tCSPWH tCSH D14 D6 D13 D5 D12 D4 tDOD D1 D0
DOUT
CS
Figure 11. DAC/GPIO Serial-Interface Timing (Clock Mode 11)
SCLK
1
2
8
9
10
24
DIN
BIT 7 (MSB)
BIT 6
BIT 0 (LSB)
BIT 15
BIT 14
BIT 1
BIT 0
DOUT THE COMMAND BYTE INITIALIZES THE DAC SELECT REGISTER CS THE NEXT 16 BITS SELECT THE DAC AND THE DATA WRITTEN TO IT
Figure 12. DAC-Select Register Byte and DAC Serial-Interface Word
______________________________________________________________________________________
39
10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports MAX1020-MAX1023/MAX1057/MAX1058
CS tGOD GPIO INPUT/OUTPUT tGSU
Figure 13. GPIO Timing
tLDACPWL
LDAC tS 1 LSB OUT_
Figure 14. LDAC Functionality
LDAC Functionality Drive LDAC low to transfer the content of the input registers to the DAC registers. Drive LDAC permanently low to make the DAC register transparent. The DAC output typically settles from zero to full scale within 1 LSB after 2s. See Figure 14.
The MAX1020-MAX1023/MAX1057/MAX1058 thin QFN packages contain an exposed pad on the underside of the device. Connect this exposed pad to AGND. Refer to the MAX1258EVKIT for an example of proper layout.
Definitions
Integral Nonlinearity
Integral nonlinearity (INL) is the deviation of the values on an actual transfer function from a straight line. This straight line can be either a best-straight-line fit or a line drawn between the end points of the transfer function, once offset and gain errors have been nullified. INL for the MAX1020-MAX1023/MAX1057/MAX1058 is measured using the end-point method.
Layout, Grounding, and Bypassing
For best performance, use PC boards. Ensure that digital and analog signal lines are separated from each other. Do not run analog and digital signals parallel to one another (especially clock signals) or do not run digital lines underneath the MAX1020-MAX1023/ MAX1057/MAX1058 package. High-frequency noise in the AV DD power supply may affect performance. Bypass the AV DD supply with a 0.1F capacitor to AGND, close to the AVDD pin. Bypass the DVDD supply with a 0.1F capacitor to DGND, close to the DVDD pin. Minimize capacitor lead lengths for best supply-noise rejection. If the power supply is very noisy, connect a 10 resistor in series with the supply to improve powersupply filtering.
40
Differential Nonlinearity
Differential nonlinearity (DNL) is the difference between an actual step width and the ideal value of 1 LSB. A DNL error specification of less than 1 LSB guarantees no missing codes and a monotonic transfer function.
______________________________________________________________________________________
10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports
Unipolar ADC Offset Error
For an ideal converter, the first transition occurs at 0.5 LSB, above zero. Offset error is the amount of deviation between the measured first transition point and the ideal first transition point.
Signal-to-Noise Plus Distortion
Signal-to-noise plus distortion (SINAD) is the ratio of the fundamental input frequency's RMS amplitude to the RMS equivalent of all other ADC output signals: SINAD(dB) = 20 x log (SignalRMS / NoiseRMS)
MAX1020-MAX1023/MAX1057/MAX1058
Bipolar ADC Offset Error
While in bipolar mode, the ADC's ideal midscale transition occurs at AGND -0.5 LSB. Bipolar offset error is the measured deviation from this ideal value.
Effective Number of Bits
Effective number of bits (ENOB) indicates the global accuracy of an ADC at a specific input frequency and sampling rate. An ideal ADC's error consists of quantization noise only. With an input range equal to the fullscale range of the ADC, calculate the ENOB as follows: ENOB = (SINAD - 1.76) / 6.02
ADC Gain Error
Gain error is defined as the amount of deviation between the ideal transfer function and the measured transfer function, with the offset error removed and with a full-scale analog input voltage applied to the ADC, resulting in all ones at DOUT.
Total Harmonic Distortion
Total harmonic distortion (THD) is the ratio of the RMS sum of the first five harmonics of the input signal to the fundamental itself. This is expressed as: THD = 20 x log
DAC Offset Error
DAC offset error is determined by loading a code of all zeros into the DAC and measuring the analog output voltage.
(V22 + V32 + V42 + V52 + V62) / V1
DAC Gain Error
DAC gain error is defined as the amount of deviation between the ideal transfer function and the measured transfer function, with the offset error removed, when loading a code of all ones into the DAC.
where V1 is the fundamental amplitude, and V2 through V6 are the amplitudes of the first five harmonics.
Spurious-Free Dynamic Range
Spurious-free dynamic range (SFDR) is the ratio of RMS amplitude of the fundamental (maximum signal component) to the RMS value of the next largest distortion component.
Aperture Jitter
Aperture jitter (tAJ) is the sample-to-sample variation in the time between the samples.
Aperture Delay
Aperture delay (t AD ) is the time between the rising edge of the sampling clock and the instant when an actual sample is taken.
ADC Channel-to-Channel Crosstalk
Bias the ON channel to midscale. Apply a full-scale sine wave test tone to all OFF channels. Perform an FFT on the ON channel. ADC channel-to-channel crosstalk is expressed in dB as the amplitude of the FFT spur at the frequency associated with the OFF channel test tone.
Signal-to-Noise Ratio
For a waveform perfectly reconstructed from digital samples, signal-to-noise ratio (SNR) is the ratio of full-scale analog input (RMS value) to the RMS quantization error (residual error). The ideal, theoretical minimum analogto-digital noise is caused by quantization error only and results directly from the ADC's resolution (N bits): SNR = (6.02 x N + 1.76)dB In reality, there are other noise sources besides quantization noise, including thermal noise, reference noise, clock jitter, etc. Therefore, SNR is calculated by taking the ratio of the RMS signal to the RMS noise. RMS noise includes all spectral components to the Nyquist frequency excluding the fundamental, the first five harmonics, and the DC offset.
Intermodulation Distortion (IMD)
IMD is the total power of the intermodulation products relative to the total input power when two tones, f1 and f2, are present at the inputs. The intermodulation products are (f1 f2), (2 x f1), (2 x f2), (2 x f1 f2), (2 x f2 f1). The individual input tone levels are at -7dB FS.
Small-Signal Bandwidth
A small -20dB FS analog input signal is applied to an ADC so the signal's slew rate does not limit the ADC's performance. The input frequency is then swept up to the point where the amplitude of the digitized conversion result has decreased by -3dB. Note that the T/H performance is usually the limiting factor for the smallsignal input bandwidth.
______________________________________________________________________________________
41
10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports MAX1020-MAX1023/MAX1057/MAX1058
Full-Power Bandwidth
A large -0.5dB FS analog input signal is applied to an ADC, and the input frequency is swept up to the point where the amplitude of the digitized conversion result has decreased by -3dB. This point is defined as fullpower input bandwidth frequency.
DAC Power-Supply Rejection
DAC PSR is the amount of change in the converter's value at full-scale as the power-supply voltage changes from its nominal value. PSR assumes the converter's linearity is unaffected by changes in the power-supply voltage.
DAC Digital Feedthrough
DAC digital feedthrough is the amount of noise that appears on the DAC output when the DAC digital control lines are toggled.
ADC Power-Supply Rejection
ADC power-supply rejection (PSR) is defined as the shift in offset error when the power-supply is moved from the minimum operating voltage to the maximum operating voltage.
Chip Information
TRANSISTOR COUNT: 58,141 PROCESS: BiCMOS
42
______________________________________________________________________________________
10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports
Pin Configurations
CNVST/AIN7 TOP VIEW REF2/AIN10 REF2/AIN6 AIN5
MAX1020-MAX1023/MAX1057/MAX1058
N.C. N.C. AIN4 AIN3 AIN2 AIN1
AIN9 AIN8
AIN7 N.C.
33 32
36
35
34
33
32
31
30
29
28
36
35
34
31
30
29
GPIOA0 GPIOA1 EOC DVDD DGND DOUT SCLK DIN OUT0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
27 26 25 24 23 22 21 20 19
AIN0 REF1 GPIOC1 GPIOC0 N.C. RES_SEL CS LDAC OUT7
28
AIN6 AIN5 AIN4 AIN3
CNVST/AIN11 N.C. EOC DVDD DGND DOUT SCLK DIN OUT0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
27 26 25 24 23 22 21 20 19
AIN2 REF1 AIN1 N.C. AIN0 RES_SEL CS LDAC OUT7
MAX1020 MAX1021
MAX1022 MAX1023
OUT1
OUT2 OUT3 AVDD AGND N.C. OUT4
OUT5
OUT6
OUT1
OUT2 OUT3 AVDD AGND N.C. OUT4
OUT5
THIN QFN
REF2/AIN14
THIN QFN
AIN13
AIN12
AIN11
AIN10
AIN9
AIN8
AIN7
AIN6
AIN5
AIN4
48
47
46
45
44
43
42
41
40
39
38
37
AIN3
CNVST/AIN15 GPIOA0 GPIOA1 EOC GPIOA2 GPIOA3 DVDD DGND DOUT SCLK DIN OUT0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
36 35 34 33 32 31
AIN2 REF1 AIN1 AIN0 GPIOC3 GPIOC2 GPIOC1 GPIOC0 RES_SEL CS LDAC OUT7
MAX1057 MAX1058
30 29 28 27 26 25
OUT1
GPIOB0
OUT2
OUT3
OUT4
OUT5
GPIOB1
AGND
GPIOB2
THIN QFN
______________________________________________________________________________________
GPIOB3
OUT6
AVDD
OUT6
43
10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports MAX1020-MAX1023/MAX1057/MAX1058
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
D2 D D/2 k
C L
b D2/2
E/2 E2/2 E (NE-1)Xe
C L
E2
k L DETAILA e (ND-1)Xe DETAILB
e L
C L
C L
L1
L
L
e
e
A1
A2
A
TITLE:
SEMICONDUCTOR
PROPRIETARYINFORMATION
DALLAS
PACKAGEOUTLINE 32,44,48,56LTHINQFN,7x7x0.8mm
DOCUMENTCONTROLNO. REV.
APPROVAL
21-0144
D
1
2
44
______________________________________________________________________________________
32, 44, 48L QFN.EPS
10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
MAX1020-MAX1023/MAX1057/MAX1058
SEMICONDUCTOR
PROPRIETARYINFORMATION TITLE:
DALLAS
PACKAGEOUTLINE 32,44,48,56LTHINQFN,7x7x0.8mm
DOCUMENTCONTROLNO. REV.
APPROVAL
21-0144
D
2
2
______________________________________________________________________________________
45
10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports MAX1020-MAX1023/MAX1057/MAX1058
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
D2 D D/2 k
C L
b D2/2
E/2 E2/2 E (NE-1)Xe
C L
E2
k
e (ND-1)Xe
L
e L
C L C L
L1 L L
e
e
A1
A2
A
PACKAGEOUTLINE 36,40,48LTHINQFN,6x6x0.8mm
21-0141
E
1
2
46
______________________________________________________________________________________
QFN THIN 6x6x0.8.EPS
10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
MAX1020-MAX1023/MAX1057/MAX1058
NOTES: 1.DIMENSIONING&TOLERANCINGCONFORMTOASMEY14.5M-1994. 2.ALLDIMENSIONSAREINMILLIMETERS.ANGLESAREINDEGREES. 3.NISTHETOTALNUMBEROFTERMINALS. 4.THETERMINAL#1IDENTIFIERANDTERMINALNUMBERINGCONVENTIONSHALLCONFORMTOJESD95-1 SPP-012.DETAILSOFTERMINAL#1IDENTIFIERAREOPTIONAL,BUTMUSTBELOCATEDWITHINTHE ZONEINDICATED.THETERMINAL#1IDENTIFIERMAYBEEITHERAMOLDORMARKEDFEATURE. 5.DIMENSIONbAPPLIESTOMETALLIZEDTERMINALANDISMEASUREDBETWEEN0.25mmAND0.30mm FROMTERMINALTIP. 6.NDANDNEREFERTOTHENUMBEROFTERMINALSONEACHDANDESIDERESPECTIVELY. 7.DEPOPULATIONISPOSSIBLEINASYMMETRICALFASHION. 8.COPLANARITYAPPLIESTOTHEEXPOSEDHEATSINKSLUGASWELLASTHETERMINALS. 9.DRAWINGCONFORMSTOJEDECMO220,EXCEPTFOR0.4mmLEADPITCHPACKAGET4866-1. 10.WARPAGESHALLNOTEXCEED0.10mm.
PACKAGEOUTLINE 36,40,48LTHINQFN,6x6x0.8mm
21-0141
E
2
2
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
47 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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