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19-1203; Rev 1; 1/01
1ppm/C, Low-Noise, +2.5V/+4.096V/+5V Voltage References
General Description
The MAX6325/MAX6341/MAX6350 are low-noise, precision voltage references with extremely low, 0.5ppm/C typical temperature coefficients and excellent, 0.02% initial accuracy. These devices feature buried-zener technology for lowest noise performance. Load-regulation specifications are guaranteed for source and sink currents up to 15mA. Excellent line and load regulation and low output impedance at high frequencies make them ideal for high-resolution data-conversion systems up to 16 bits. The MAX6325 is set for a 2.5V output, the MAX6341 is set for a 4.096V output, and the MAX6350 is set for a 5V output. All three provide for the option of external trimming and noise reduction.
____________________________Features
o Ultra Low, 1ppm/C Max Tempco o Very Low, 1.5Vp-p Noise (0.1Hz to 10Hz) (MAX6325) o 0.02% Initial Accuracy (MAX6350) o 15mA Output Source and Sink Current o Low, 18mW Power Consumption (MAX6325) o Industry-Standard Pinout o Optional Noise Reduction and Voltage Trim o Excellent Transient Response o 8-Pin SO Package Available o Low, 30ppm/1000hr Long-Term Stability o Stable for All Capacitive Loads
MAX6325/MAX6341/MAX6350
________________________Applications
High-Resolution Analog-to-Digital and Digital-to-Analog Converters High-Accuracy Reference Standard High-Accuracy Industrial and Process Control Digital Voltmeters ATE Equipment Precision Current Sources
MAX6325CPA MAX6325CSA MAX6325EPA MAX6325ESA MAX6325MJA PART
Ordering Information
TEMP. RANGE 0C to +70C 0C to +70C -40C to +85C -40C to +85C -55C to +125C PINPACKAGE 8 Plastic DIP 8 SO 8 Plastic DIP 8 SO 8 CERDIP MAX TEMPCO (ppm/C) 1.0 1.0 1.5 1.5 2.5
Ordering Information continued at end of data sheet.
Typical Operating Circuit
8V TO 36V INPUT
Pin Configuration
TOP VIEW
IN OUT 2.2F *
REFERENCE OUT
I.C. 1 IN 2 NR 3
8
I.C. I.C. OUT TRIM
NR
MAX6325 MAX6341 MAX6350
GND
TRIM 2.2F * GND 4
MAX6325 MAX6341 MAX6350
7 6 5
DIP/SO
*OPTIONAL
I.C. = INTERNALLY CONNECTED; DO NOT USE
________________________________________________________________ Maxim Integrated Products
1
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.
1ppm/C, Low-Noise, +2.5V/+4.096V/+5V Voltage References MAX6325/MAX6341/MAX6350
ABSOLUTE MAXIMUM RATINGS
(Voltages Referenced to GND) IN ................................................................................-0.3V to 40V OUT, TRIM..................................................................-0.3V to 12V NR.................................................................................-0.3V to 6V OUT Short-Circuit to GND Duration (VIN 12V)..........Continuous OUT Short-Circuit to GND Duration (VIN 40V) ........................5s OUT Short-Circuit to IN Duration (VIN 12V) ..............Continuous Continuous Power Dissipation (TA = +70C) 8-Pin Plastic DIP (derate 9.09mW/C above +70C) ......727mW 8-Pin SO (derate 5.88mW/C above +70C) ...................471mW 8-Pin CERDIP (derate 8.00mW/C above +70C)...........640mW Operating Temperature Ranges MAX63_ _ C_ A.......................................................0C to +70C MAX63_ _ E_ A....................................................-40C to +85C MAX63_ _ MJA ..................................................-55C to +125C Storage Temperature Range ..............................-65C to +150C Lead Temperature (soldering, 10s)...................................+300C
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--MAX6325
(VIN = +10V, IOUT = 0mA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER Input Voltage Range Output Voltage Output Voltage Temperature Coefficient (Note 1) SYMBOL VIN VOUT TCVOUT MAX6325 MAX6325C_A MAX6325E_A MAX6325MJA CONDITIONS TA C, E, M +25C C E M +25C 8V VIN 10V Line Regulation (Note 2) VOUT/ VIN 10V VIN 36V C E M +25C C E M C Sourcing: 0mA IOUT 15mA Load Regulation (Note 2) VOUT/ IOUT Sinking: -15mA IOUT 0mA E M C E M Supply Current Trim-Adjustment Range Turn-On Settling Time Output Noise Voltage (Note 3) Temperature Hysteresis Long-Term Stability VOUT/t IIN VOUT tON en (Figure 1) To 0.01% of final value 0.1Hz f 10Hz 10Hz f 1kHz (Note 4) +25C C, E, M C, E, M +25C +25C +25C +25C +25C 15 25 5 1.5 1.3 20 30 2.8 1 1 3 1 1 10 1.8 2 MIN 8 2.499 2.500 0.5 0.75 1.0 10 TYP MAX 36 2.501 1.0 1.5 2.5 18 30 35 45 5 7 8 10 6 7 15 6 7 30 2.7 3.0 mA mV s Vp-p VRMS ppm ppm/ 1000hr ppm/mA ppm/V ppm/C UNITS V V
2
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1ppm/C, Low-Noise, +2.5V/+4.096V/+5V Voltage References MAX6325/MAX6341/MAX6350
ELECTRICAL CHARACTERISTICS--MAX6341
(VIN = +10V, IOUT = 0mA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER Input Voltage Range Output Voltage Output Voltage Temperature Coefficient (Note 1) SYMBOL VIN VOUT TCVOUT MAX6341 MAX6341C_A MAX6341E_A MAX6341MJA CONDITIONS TA C, E, M +25C C E M +25C 8V VIN 10V Line Regulation (Note 2) VOUT/ VIN 10V VIN 36V C E M +25C C E M C Sourcing: 0mA IOUT 15mA Load Regulation (Note 2) VOUT/ IOUT Sinking: -15mA IOUT 0mA E M C E M Supply Current Trim-Adjustment Range Turn-On Settling Time Output Noise Voltage (Note 3) Temperature Hysteresis Long-Term Stability VOUT/t IIN VOUT tON en (Figure 1) To 0.01% of final value 0.1Hz f 10Hz 10Hz f 1kHz (Note 4) +25C C, E, M C, E, M +25C +25C +25C +25C +25C 24 40 8 2.4 2.0 20 30 4.0 1 1 3 1 1 7 1.9 2 MIN 8 4.095 4.096 0.5 0.75 1.0 10 TYP MAX 36 4.097 1.0 1.5 2.5 18 30 35 45 5 7 8 10 6 7 9 6 7 18 2.9 3.2 mA mV s Vp-p VRMS ppm ppm/ 1000hr ppm/mA ppm/V ppm/C UNITS V V
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3
1ppm/C, Low-Noise, +2.5V/+4.096V/+5V Voltage References MAX6325/MAX6341/MAX6350
ELECTRICAL CHARACTERISTICS--MAX6350
(VIN = +10V, IOUT = 0mA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER Input Voltage Range Output Voltage Output Voltage Temperature Coefficient (Note 1) SYMBOL VIN VOUT TCVOUT MAX6350 MAX6350C_A MAX6350E_A MAX6350MJA CONDITIONS TA C, E, M +25C C E M +25C 8V VIN 10V Line Regulation (Note 2) VOUT/ VIN 10V VIN 36V C E M +25C C E M C Sourcing: 0mA IOUT 15mA Load Regulation (Note 2) VOUT/ IOUT Sinking: -15mA IOUT 0mA E M C E M Supply Current Trim-Adjustment Range Turn-On Settling Time Output Noise Voltage (Note 3) Temperature Hysteresis Long-Term Stability VOUT/t IIN VOUT tON en (Figure 1) To 0.01% of final value 0.1Hz f 10Hz 10Hz f 1kHz (Note 4) +25C C, E, M C, E, M +25C +25C +25C +25C +25C 30 50 10 3.0 2.5 20 30 5.0 1 1 2 1 1 6 2.0 2 MIN 8 4.999 5.000 0.5 0.75 1.0 10 TYP MAX 36 5.001 1.0 1.5 2.5 18 30 35 45 5 7 8 10 6 7 9 6 7 15 3.0 3.3 mA mV s Vp-p VRMS ppm ppm/ 1000hr ppm/mA ppm/V ppm/C UNITS V V
Note 1: Temperature coefficient is measured by the box method; i.e., the maximum VOUT is divided by T x VOUT. Note 2: Line regulation (VOUT / (VOUT x VIN)) and load regulation (VOUT / (VOUT x IOUT)) are measured with pulses and do not include output voltage changes due to die-temperature changes. Note 3: Noise specifications are guaranteed by design. Note 4: Temperature hysteresis is specified at TA = +25C by measuring VOUT before and after changing temperature by +25C, using the plastic DIP package.
4
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1ppm/C, Low-Noise, +2.5V/+4.096V/+5V Voltage References
__________________________________________Typical Operating Characteristics
(VIN = +10V, IOUT = 0mA, TA = +25C, unless otherwise noted.)
MAX6325/MAX6341/MAX6350
MAX6350 NORMALIZED OUTPUT VOLTAGE vs. TEMPERATURE
2.0 1.5 1.0 VOUT (mV) 0.5 0
MAX6325 -01
MAX6341 NORMALIZED OUTPUT VOLTAGE vs. TEMPERATURE
400 300 200 VOUT (ppm) VOUT (ppm) VOUT (mV) 100 0 0.5 125 VOUT (mV) 1.5
MAX6325 -02
MAX6325 NORMALIZED OUTPUT VOLTAGE vs. TEMPERATURE
375 250 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0
MAX6325 03
280 240 200 160 120 80 40 0 -40 -80 -120 VOUT (ppm)
1.0
0
0
-0.5 -1.0 -1.5 -55 -35 -15
-100 -0.5 -200 -300 65 85 105 125 -1.0 -55 -35 -15 -250 65 85 105 125 -125
-0.1 -0.2 -0.3 -0.4 -55 -35 -15
5
25 45
5
25 45
5
25 45
-160 65 85 105 125
TEMPERATURE (C)
TEMPERATURE (C)
TEMPERATURE (C)
CHANGE IN OUTPUT VOLTAGE vs. INPUT VOLTAGE
MAX6325-04
MAX6325 CHANGE IN OUTPUT VOLTAGE vs. OUTPUT CURRENT
MAX6325-05
MAX6341 CHANGE IN OUTPUT VOLTAGE vs. OUTPUT CURRENT
TA = +85C
MAX6325-06
60 50 40 VOUT (ppm) 30 20 10 0 -10 -20 0 5 10 15 20 VIN (V) 25 30 35
200 150 100
300 200 100 0 -100 TA = -40C
VOUT (V)
VOUT (V)
50 0 -50 -100 -150 -200 -250 TA = +85C TA = -40C TA = +25C
TA = +25C
-200 -300
40
-40 -30 -20 -10
0
10
20
30
40
-40 -30 -20 -10
0
10
20
30
40
IOUT (mA)
IOUT (mA)
MAX6350 CHANGE IN OUTPUT VOLTAGE vs. OUTPUT CURRENT
MAX6325-07
SUPPLY CURRENT vs. SUPPLY VOLTAGE
2.8 SUPPLY CURRENT (mA) 2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 1.0 0 5 10 15 20 25 30 35 40 MAX6325 MAX6341 MAX6350
MAX6325-08
SUPPLY CURRENT vs. TEMPERATURE
MAX6325-09
300 200 100 VOUT (V) 0 -100 -200 -300 -400 -40 -30 -20 -10 0 10 20 30 TA = +25C TA = -40C TA = +85C
3.0
3.5
SUPPLY CURRENT (mA)
3.0
2.5 MAX6341 2.0
MAX6350
1.5 MAX6325
40
-55 -35 -15
5
25 45
65 85 105 125
IOUT (mA)
SUPPLY VOLTAGE (V)
TEMPERATURE (C)
_______________________________________________________________________________________
5
1ppm/C, Low-Noise, +2.5V/+4.096V/+5V Voltage References MAX6325/MAX6341/MAX6350
____________________________Typical Operating Characteristics (continued)
(VIN = +10V, IOUT = 0mA, TA = +25C, unless otherwise noted.)
MAX6325 OUTPUT NOISE-VOLTAGE DENSITY vs. FREQUENCY
MAX6325-10
MAX6341 OUTPUT NOISE-VOLTAGE DENSITY vs. FREQUENCY
MAX6325-11
MAX6350 OUTPUT NOISE-VOLTAGE DENSITY vs. FREQUENCY
OUTPUT NOISE DENSITY (nV/ Hz) 90 80 70 60 50 40 30 20 10 0 10 100 1k 10k CNR = 1F CNR = 0F
MAX6325-12
50 OUTPUT NOISE DENSITY (nV/ Hz) 45 40 35 30 25 20 15 10 5 0 10 100 1k CNR = 1F CNR = 0F
90 OUTPUT NOISE DENSITY (nV/ Hz) 80 70 60 50 40 30 20 10 0 10 100 1k CNR = 1F CNR = 0F
100
10k
10k
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
RIPPLE REJECTION vs. FREQUENCY (CNR = 1F)
MAX6325-13
OUTPUT IMPEDANCE vs. FREQUENCY
MAX6325-14
RIPPLE REJECTION vs. FREQUENCY (CNR = 0F)
90 RIPPLE REJECTION (dB) 85 MAX6350 80 75 70 65 MAX6341 MAX6325
MAX6325-15
MAX6325-18
120 110 RIPPLE REJECTION (dB) 100 90 MAX6350 80 70 60 10 100 1k 10k FREQUENCY (Hz) MAX6341 MAX6325
100
95
OUTPUT IMPEDANCE ()
10
1
0.1
ISINK = 5mA
0.01 10 100
ISOURCE = 5mA 1k 10k 100k FREQUENCY (Hz) 1M
60 10 100 1k 10k FREQUENCY (Hz)
MAX6325 0.1Hz to 10Hz NOISE
MAX6325-16
MAX6341 0.1Hz to 10Hz NOISE
MAX6325-17
MAX6350 0.1Hz to 10Hz NOISE
COUT = CNR = 0F
COUT = CNR = 0F
COUT = CNR = 0F
VOUT, 0.5V/div
VOUT, 1V/div
VOUT, 1V/div
1s/div
1s/div
1s/div
6
_______________________________________________________________________________________
1ppm/C, Low-Noise, +2.5V/+4.096V/+5V Voltage References
____________________________Typical Operating Characteristics (continued)
(VIN = +10V, IOUT = 0mA, TA = +25C, unless otherwise noted.)
MAX6325/MAX6341/MAX6350
LOAD-TRANSIENT RESPONSE (SOURCING)
MAX6325-19
LOAD-TRANSIENT RESPONSE (SINKING)
MAX6325-20
0mA A -10mA A
10mA 0mA
B B
2s/div A: IOUT, 10mA/div (SOURCING) B: VOUT, 500V/div
2s/div A: IOUT, 10mA/div (SINKING) B: VOUT, 500V/div
LOAD-TRANSIENT RESPONSE
MAX6325-21
MAX6325 TURN-ON AND TURN-OFF TRANSIENT RESPONSE
MAX6325-22
A
-10mA +10mA
+10V A 0
B
VIN = 10V COUT = CNR = 0F 1s/div A: IOUT (10mA SOURCE AND SINK), 20mA/div, AC COUPLED B: VOUT, 20mV/div, AC COUPLED
B CIN = COUT = CNR = 0F 1s/div A: VIN, 10V/div B: VOUT, 1V/div
MAX6341 TURN-ON AND TURN-OFF TRANSIENT RESPONSE
MAX6325-23
MAX6350 TURN-ON AND TURN-OFF TRANSIENT RESPONSE
MAX6325-24
+10V A 0 A
+10V 0
B CIN = COUT = CNR = 0F 1s/div A: VIN, 10V/div B: VOUT, 1V/div
B CIN = COUT = CNR = 0F 1s/div A: VIN, 10V/div B: VOUT, 1V/div
_______________________________________________________________________________________
7
1ppm/C, Low-Noise, +2.5V/+4.096V/+5V Voltage References MAX6325/MAX6341/MAX6350
_____________________Pin Description
PIN 1, 7, 8 2 NAME I.C. IN FUNCTION Internally Connected. Do not use. Positive Power-Supply Input Noise Reduction. Optional capacitor connection for wideband noise reduction. Leave open if not used (Figure 2). Ground External Trim Input. Allows 1% output adjustment (Figure 1). Leave open if not used. Voltage Reference Output
Noise Reduction
To augment wideband noise reduction, add a 1F capacitor to the NR pin (Figure 2). Larger values do not improve noise appreciably (see Typical Operating Characteristics). Noise in the power-supply input can affect output noise, but can be reduced by adding an optional bypass capacitor to the IN pin and GND.
3
NR
Bypassing
The MAX6325/MAX6341/MAX6350 are stable with capacitive load values from 0F to 100F, for all values of load current. Adding an output bypass capacitor can help reduce noise and output glitching caused by load transients.
4 5 6
GND TRIM OUT
__________Applications Information
Negative Regulator
Figure 3 shows how both a +5V and -5V precision reference can be obtained from a single, unregulated +5V supply. A MAX865 generates approximately 9V to operate the MAX6350 reference and MAX400 inverting amplifier. The +5V is inverted by the ultra-low offset MAX400 op amp. Resistor R1 is optional, and may be used to trim the 5V references. R2 and R4 should be matched, both in absolute resistance and temperature coefficient. R3 is optional, and is adjusted to set the -5V reference.
_______________Detailed Description
Temperature Stability
The MAX6325/MAX6341/MAX6350 are highly stable, low-noise voltage references that use a low-power temperature-compensation scheme to achieve laboratorystandard temperature stability. This produces a nearly flat temperature curve, yet does not require the power associated with heated references. The output voltage can be trimmed a minimum of 0.6% by connecting a 10k potentiometer between OUT and GND, and connecting its tap to the TRIM pin, as shown in Figure 1. The external trimming does not affect temperature stability.
8V TO 36V INPUT
8V TO 36V INPUT
IN OUT
REFERENCE OUT * TRIM 10k 1F NR
IN OUT
REFERENCE OUT
NR
MAX6325 MAX6341 MAX6350
GND
MAX6325 MAX6341 MAX6350
GND
TRIM
*OPTIONAL
Figure 1. Output Voltage Adjustment
Figure 2. Noise-Reduction Capacitor
8
_______________________________________________________________________________________
1ppm/C, Low-Noise, +2.5V/+4.096V/+5V Voltage References MAX6325/MAX6341/MAX6350
+5V INPUT C1+ C1VCC V+ IN +REFERENCE OUT OUT R2 100k R1 10k C3 2.2F 0.1F R3 1k C4 1F
3.3F
MAX865
3.3F C2+ C2GND VC1 2.2F NR GND C2 1F
MAX6350
TRIM
MAX400
2.2F
R4 100k
0.1F
-REFERENCE OUT
Figure 3. +5V and -5V References from a Single +5V Supply
Ordering Information (continued)
PART MAX6341CPA MAX6341CSA MAX6341EPA MAX6341ESA MAX6341MJA MAX6350CPA MAX6350CSA MAX6350EPA MAX6350ESA MAX6350MJA TEMP. RANGE 0C to +70C 0C to +70C -40C to +85C -40C to +85C -55C to +125C 0C to +70C 0C to +70C -40C to +85C -40C to +85C -55C to +125C PINPACKAGE 8 Plastic DIP 8 SO 8 Plastic DIP 8 SO 8 CERDIP 8 Plastic DIP 8 SO 8 Plastic DIP 8 SO 8 CERDIP MAX. TEMPCO (ppm/C) 1.0 1.0 1.5 1.5 2.5 1.0 1.0 1.5 1.5 2.5
___________________Chip Information
TRANSISTOR COUNT: 435
_______________________________________________________________________________________
9
1ppm/C, Low-Noise, +2.5V/+4.096V/+5V Voltage References MAX6325/MAX6341/MAX6350
________________________________________________________Package Information
SOICN.EPS
10
______________________________________________________________________________________
PDIPN.EPS
1ppm/C, Low-Noise, +2.5V/+4.096V/+5V Voltage References
___________________________________________Package Information (continued)
CDIPS.EPS
MAX6325/MAX6341/MAX6350
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 ___________________11 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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