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19-1087; Rev 1; 8/97
Single/Dual/Quad, Wide-Bandwidth, Low-Power, Single-Supply Rail-to-Rail I/O Op Amps
General Description
The MAX4122-MAX4129 family of operational amplifiers combines wide bandwidth and excellent DC accuracy with Rail-to-Rail(R) operation at the inputs and outputs. These devices require only 650A per amplifier, and operate from either a single supply (+2.7V to +6.5V) or dual supplies (1.35V to 3.25V) with a common-mode voltage range that extends 250mV beyond VEE and VCC. They are capable of driving 250 loads. The MAX4122/MAX4123/ MAX4126/MAX4127/MAX4129 have a 5MHz gain bandwidth product, while the decompensated MAX4124/ MAX4125/MAX4128 (stable at closed-looped gains of 10 or greater) have a 25MHz gain bandwidth product. In addition, the MAX4123/MAX4125/MAX4127 feature a shutdown mode in which the outputs are placed in a high-impedance state and the supply current is reduced to only 25A per amplifier. With their rail-to-rail input common-mode range and output swing, these amplifiers are ideal for low-voltage single-supply operation. Although the minimum operating voltage is specified at 2.7V, the devices typically operate down to 1.8V. In addition, low offset voltage and high speed make them the ideal signal-conditioning stages for precision, low-voltage, data-acquisition systems. The MAX4122 and MAX4124 come in the space-saving 5-pin SOT23-5 package. o 5-Pin SOT23 Package (MAX4122/4) o +2.7V to +6.5V Single-Supply Operation o Rail-to-Rail Input Common-Mode Voltage Range o Rail-to-Rail Output Voltage Swing o 5MHz Gain-Bandwidth Product (MAX4122/3/6/7/9) 25MHz Gain-Bandwidth Product (MAX4124/5/8) o 650A Quiescent Current per Amplifier o 25A Shutdown Function (MAX4123/5/7) o 200V Offset Voltage o No Phase Reversal for Overdriven Inputs o Drive 250 Loads o Stable with 500pF Capacitive Loads o Unity-Gain Stable (MAX4122/3/6/7/9) Stable at Gains 10V/V (MAX4124/5/8)
Features
MAX4122-MAX4129
Ordering Information
PART TEMP. RANGE PINPACKAGE 5 SOT23-5 MARKING INFO. AAAZ
________________________Applications
Battery-Powered Instruments Portable Equipment Data-Acquisition Systems Signal Conditioning Low-Power, Low-Voltage Applications
MAX4122EUK -40C to +85C
MAX4123C/D -- 0C to +70C Dice* -- MAX4123ESA -40C to +85C 8 SO MAX4123EUA -40C to +85C 8 MAX -- Ordering Information continued at end of data sheet. *Dice are specified at TA = +25C, DC parameters only.
Pin Configurations appear at end of data sheet.
Selection Table
PART MAX4122 MAX4123 MAX4124 MAX4125 MAX4126 MAX4127 MAX4128 MAX4129 BW (MHz) 5 5 25 25 5 5 25 5 AMPS PER PKG. 1 1 1 1 2 2 2 4 SHUTDOWN MODE -- Yes -- Yes -- Yes -- -- PINPACKAGE 5 SOT23-5 8 SO/MAX 5 SOT23-5 8 SO/MAX 8 SO/MAX 14 SO 8 SO/MAX 14 SO
__________Typical Operating Circuit
+5V
MAX187
3 6 SERIAL INTERFACE 8 7 SHDN DOUT SCLK CS VDD AIN VREF GND 1 2
MAX4123
4 5
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468.
Single/Dual/Quad, Wide-Bandwidth, Low-Power, Single-Supply Rail-to-Rail I/O Op Amps MAX4122-MAX4129
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC-VEE).....................................................7.5V IN+, IN-, SHDN Voltage ...................(VCC + 0.3V) to (VEE - 0.3V) Output Short-Circuit Duration (Note 1).......................Continuous (short to either supply) Continuous Power Dissipation (TA = +70C) 5-pin SOT23-5 (derate 7.1mW/C above +70C) .........571mW 8-pin SO (derate 5.88mW/C above +70C).................471mW 8-pin MAX (derate 4.10mW/C above +70C) ............330mW 14-pin SO (derate 8.00mW/C above +70C)...............640mW Operating Temperature Range MAX412_E__ ....................................................-40C to +85C Maximum Junction Temperature .....................................+150C Storage Temperature Range .............................-65C to +160C Lead Temperature (soldering, 10sec) .............................+300C
Note 1: Provided that the maximum package power-dissipation rating is met.
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.
DC ELECTRICAL CHARACTERISTICS
(VCC = +2.7V to +6.5V, V EE = 0V, V CM = 0V, V OUT = V CC/2, R L tied to V CC/2, SHDN 2V (or open), T A = +25C, unless otherwise noted.) PARAMETER CONDITIONS MAX4123ESA/MAX4125ESA MAX4122EUK/MAX4124EUK Input Offset Voltage VCM = VEE to VCC MAX4123EUA/MAX4125EUA MAX4126ESA/MAX4127ESD/MAX4128ESA MAX4126EUA/MAX4128EUA MAX4129ESD Input Bias Current Input Offset Current Differential Input Resistance Common-Mode Input Voltage Range MAX4123ESA/MAX4125ESA (VEE 0.25) < VCM < (VCC + 0.25V) MAX4122EUK/MAX4124EUK MAX4123EUA/MAX4125EUA MAX4126ESA/MAX4127ESD/MAX4128ESA MAX4126EUA/MAX4128EUA MAX4129ESD Power-Supply Rejection Ratio Output Resistance Off-Leakage Current VCC = 2.7V to 6.5V AV = 1 SHDN < 0.8V, VOUT = 0V to VCC VCC = 2.7V Large-Signal Voltage Gain VCC = 5V VOUT = 0.25V to 2.45V, RL = 100k VOUT = 0.4V to 2.3V, RL = 250 VOUT = 0.25V to 4.75V, RL = 100k VOUT = 0.4V to 4.6V, RL = 250 92 72 94 75 VCM = VEE to VCC VCM = VEE to VCC -1.5V < VDIFF < 1.5V VEE 0.25 78 67 68 74 66 64 78 98 90 88 94 86 84 100 0.1 0.1 104 80 106 84 dB 1 dB A dB MIN TYP 0.20 0.35 0.35 0.25 0.40 0.35 50 1 500 VCC + 0.25 MAX 0.60 1.50 1.20 0.75 1.50 1.50 150 12 nA nA k V mV UNITS
Common-Mode Rejection Ratio
2
_______________________________________________________________________________________
Single/Dual/Quad, Wide-Bandwidth, Low-Power, Single-Supply Rail-to-Rail I/O Op Amps
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +2.7V to +6.5V, V EE = 0V, V CM = 0V, V OUT = V CC/2, R L tied to V CC/2, SHDN 2V (or open), T A = +25C, unless otherwise noted.) PARAMETER MAX4122/ MAX4123/ MAX4124/ MAX4125 Output Voltage Swing MAX4126/ MAX4127/ MAX4128/ MAX4129 Output Short-Circuit Current SHDN Logic Threshold SHDN Input Current Operating Supply-Voltage Range Supply Current per Amplifier Shutdown Supply Current per Amplifier VCM = VOUT = VCC/2 SHDN > 0.8V, MAX4123/MAX4125/MAX4127 VCC = 2.7V VCC = 5V VCC = 2.7V VCC = 5V MAX4123/MAX4125/MAX4127 MAX4123/MAX4125/MAX4127 2.7 650 725 25 40 Low High 2.0 1 3 6.5 750 825 40 60 RL = 100k RL = 250 CONDITIONS RL = 100k RL = 250 VCC - VOH VOL - VEE VCC - VOH VOL - VEE VCC - VOH VOL - VEE VCC - VOH VOL - VEE MIN TYP 12 20 240 125 15 25 280 180 50 0.8 MAX 20 35 290 170 30 40 330 230 mA V A V A A mV UNITS
MAX4122-MAX4129
DC ELECTRICAL CHARACTERISTICS
(VCC = +2.7V to +6.5V, VEE = 0V, VCM = 0V, VOUT = VCC/2, RL tied to VCC/2, SHDN 2V (or open), TA = -40C to +85C, unless otherwise noted.) PARAMETER CONDITIONS MAX4123ESA/MAX4125ESA MAX4122EUK/MAX4124EUK Input Offset Voltage VCM = VEE to VCC MAX4123EUA/MAX4125EUA MAX4126ESA/MAX4127ESD/MAX4128ESA MAX4126EUA/MAX4128EUA MAX4129ESD Input Offset Voltage Tempco Input Bias Current Input Offset Current Common-Mode Input Voltage Range MAX4123ESA/MAX4125ESA (VEE 0.2V) < VCM < (VCC + 0.2V) MAX4122EUK/MAX4124EUK MAX4123EUA/MAX4125EUA MAX4126ESA/MAX4127ESD/MAX4128ESA MAX4126EUA/MAX4128EUA MAX4129ESD VCM = VEE to VCC VCM = VEE to VCC VEE 0.20 76 62 60 74 58 60 3 dB 2 160 18 VCC + 0.20 MIN TYP MAX 0.75 3.50 4.40 0.95 4.70 4.00 V/C nA nA V mV UNITS
Common-Mode Rejection Ratio
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Single/Dual/Quad, Wide-Bandwidth, Low-Power, Single-Supply Rail-to-Rail I/O Op Amps MAX4122-MAX4129
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +2.7V to +6.5V, VEE = 0V, VCM = 0V, VOUT = VCC/2, RL tied to VCC/2, SHDN 2V (or open), TA = -40C to +85C, unless otherwise noted.) PARAMETER Power-Supply Rejection Ratio Off-Leakage Current VCC = 2.7V to 6.5V SHDN < 0.8V, VOUT = 0V to VCC VCC = 2.7V Large-Signal Voltage Gain VCC = 5V MAX4122/ MAX4123/ MAX4124/ MAX4125 Output Voltage Swing MAX4126/ MAX4127/ MAX4128/ MAX4129 SHDN Logic Threshold SHDN Input Current Operating Supply-Voltage Range Supply Current per Amplifier Shutdown Supply Current per Amplifier VCM = VOUT = VCC/2 SHDN < 0.8V, MAX4123/MAX4125/MAX4127 VCC = 2.7V VCC = 5V VCC = 2.7V VCC = 5V RL = 100k RL = 250 VOUT = 0.25V to 2.45V, RL = 100k VOUT = 0.4V to 2.3V, RL = 250 VOUT = 0.25V to 4.75V, RL = 100k VOUT = 0.4V to 4.6V, RL = 250 RL = 100k RL = 250 VCC - VOH VOL - VEE VCC - VOH VOL - VEE VCC - VOH VOL - VEE VCC - VOH VOL - VEE Low High 2.0 3 2.7 6.5 775 850 50 70 84 66 86 68 25 40 300 190 35 50 350 250 0.8 V A V A A mV dB CONDITIONS MIN 74 12 TYP MAX UNITS dB A
MAX4123/MAX4125/MAX4127 MAX4123/MAX4125/MAX4127
AC ELECTRICAL CHARACTERISTICS
(VCC = +2.7V to +6.5V, VEE = 0V, SHDN 2V (or open), TA = +25C, unless otherwise noted.) PARAMETER Gain-Bandwidth Product Phase Margin Gain Margin Total Harmonic Distortion Slew Rate Settling Time to 0.01% Turn-On Time 4 CONDITIONS MAX4122/23/26/27/29 MAX4124/25/28 (AV 10) MAX4122/23/26/27/29 MAX4124/25/28 (AV 10) MAX4122/23/26/27/29 MAX4124/25/28 (AV 10) f = 10kHz, VOUT = 2Vp-p, MAX4122/23/26/27/29 (AV = 1) MAX4122/23/26/27/29 MAX4124/25/28 (AV 10) MAX4122/23/26/27/29 (AV = 1), VOUT = 2V step MAX4124/25/28 (AV 10), VOUT = 2V step VCC = 0V to 3V step, VOUT = VCC/2 MIN TYP 5 25 64 60 12 10 0.003 2 10 2.0 1.3 1 MAX UNITS MHz degrees dB % V/s s s
_______________________________________________________________________________________
Single/Dual/Quad, Wide-Bandwidth, Low-Power, Single-Supply Rail-to-Rail I/O Op Amps
AC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +2.7V to +6.5V, VEE = 0V, SHDN 2V (or open), TA = +25C, unless otherwise noted.) PARAMETER SHDN Delay Input Capacitance Input Noise Voltage Density Input Noise Current Density Amp-Amp Isolation Capacitive Load Stability f = 1kHz f = 1kHz MAX4126/27/28/29 MAX4122/23/26/27/29 (AV = 1) MAX4124/25/28 (AV 10) CONDITIONS VCC = 3V, VOUT = VCC/2, MAX4123/25/27 Enable Disable MIN TYP 1 0.2 3 22 0.4 135 500 500 MAX UNITS s pF nV/Hz pA/Hz dB pF
MAX4122-MAX4129
__________________________________________Typical Operating Characteristics
(VCC = +5V, VEE = 0V, VCM = VCC/2, TA = +25C, unless otherwise noted.)
MAX4322/26/29 GAIN AND PHASE vs. FREQUENCY
60 AV = +1000 NO LOAD
MAX4322/26/29-01
MAX4122/23/26/27/29 GAIN AND PHASE vs. FREQUENCY (WITH CLOAD)
180 144 60 AV = +1000 RL = CL = 500pF
MAX4122/29-02
MAX4122/23/26/27/29 POWER-SUPPLY REJECTION vs. FREQUENCY
144 0 -20 PHASE (DEGREES) PSR (dB) -40 -60 -80 -100 10 100 1k 10k 100k 1M 10M 100M AV = +1
MAX4122/29-03
180
40
108 PHASE (DEGREES) GAIN 72 36 0
40
GAIN
108 72 36 0
GAIN (dB)
0
PHASE
-36 -72
GAIN (dB)
20
20
0
PHASE
-36 -72 -108 -144
-20
-108 -144
-20
-40 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
-180 100M
-40 100
1k
10k
100k
1M
10M
-180 100M
FREQUENCY (Hz)
FREQUENCY (Hz)
MAX4124/25/28 GAIN AND PHASE vs. FREQUENCY
60 AV = +1000 NO LOAD
MAX14122/29-04
144 40 GAIN 108 PHASE (DEGREES) 72 GAIN (dB) 20 PHASE 36 0 0 -36 -72 -20 -108 -144 -40 100 1k 10k 100k 1M 10M FREQUENCY (Hz) -180 -40 100 1k 10k 100k 1M 10M -20 40 AV = +1000 RL = CL = 500 pF GAIN
144 108 PHASE (DEGREES) 72 36 PHASE 0 -36 -72 -108 -144 -180 100M
0 -20 PSR (dB) -40 -60 -80 -100 10
AV = +10
GAIN (dB)
20
0
100
1k
10k
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
_______________________________________________________________________________________
5
MAX4122/29-06
180
60
MAX4124/25/28 GAIN AND PHASE vs. FREQUENCY (WITH CLOAD) MAX4122/29-05
MAX4124/25/28 POWER-SUPPLY REJECTION vs. FREQUENCY
180
Single/Dual/Quad, Wide-Bandwidth, Low-Power, Single-Supply Rail-to-Rail I/O Op Amps MAX4122-MAX4129
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0V, VCM = VCC/2, TA = +25C, unless otherwise noted.)
MAX4126/27/28/29 CHANNEL SEPARATION vs. FREQUENCY
MAX4122/29-07
MAX4122/23/26/27/29 OUTPUT IMPEDANCE vs. FREQUENCY
MAX4122/29-08
MAX4124/25/28 OUTPUT IMPEDANCE vs. FREQUENCY
AV = +10 OUTPUT IMPEDANCE ()
MAX4122/29-09
130 120 CHANNEL SEPARATION (dB) 110 100 90 80 70 60 50 100 1k 10k 100k FREQUENCY (Hz) 1M
100 AV = +1 OUTPUT IMPEDANCE () 10
100
10
1
1
0.1
10M
0.01 100
0.1 1k 10k 100k 1M 10M 100M 100 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) FREQUENCY (Hz)
SUPPLY CURRENT PER AMPLIFIER vs. TEMPERATURE
MAX4122/29-10
MAX4323/MAX4327 SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE
MAX4322-11
OUTPUT LEAKAGE CURRENT vs. TEMPERATURE
AV = +1 SHDN = 0V VCC = 6.5V VCC = 2.7V
MAX4122/29-12
900 850 SUPPLY CURRENT (A) 800 750 700 650 600 550 500 -40 -25 -10 5 20 35 50 65 80 VCC = 2.7V VCC = 6.5V
60 SHUTDOWN SUPPLY CURRENT (mA) 50 40 30 20 10 SHDN = 0V 0 VCC = 2.7V VCC = 6.5V
20 15 LEAKAGE CURRENT (A) 10 5 0 -5 -10
VOUT SHORT TO VEE
VOUT SHORT TO VCC
VCC = 6.5V VCC = 2.7V 20 35 50 65 80 95
95
-40 -25 -10
5
20
35
50
65
80
95
-40 -25 -10
5
TEMPERATURE (C)
TEMPERATURE (C)
TEMPERATURE (C)
INPUT OFFSET VOLTAGE vs. TEMPERATURE
MAX4122/29-13
INPUT BIAS CURRENT vs. COMMON-MODE VOLTAGE
MAX4122/29-14
INPUT BIAS CURRENT vs. TEMPERATURE
40 INPUT BIAS CURRENT (nA) 30 20 10 0 -10 -20 -30 -40 -50 -60 VCC = 6.5V, VCM = VEE -40 -25 -10 5 20 35 50 65 80 95 VCC = 2.7V, VCM = VEE
MAX4122/29-15
3.00 2.25 1.50 VOLTAGE (mV) 0.75 0 -0.75 -1.50 -2.25 -3.00 -40 -25 -10 5 20 35 50 65 80 SO PACKAGE SOT23-5 PACKAGE
50 40 INPUT BIAS CURRENT (nA) 30 20 10 0 -10 -20 -30 -40 -50 VCC = 2.7V VCC = 6.5V
50 VCC = 6.5V, VCM = VCC VCC = 2.7V, VCM = VCC
95
0
1
2
3
4
5
6
TEMPERATURE (C)
COMMON-MODE VOLTAGE (V)
TEMPERATURE (C)
6
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Single/Dual/Quad, Wide-Bandwidth, Low-Power, Single-Supply Rail-to-Rail I/O Op Amps
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0V, VCM = VCC/2, TA = +25C, unless otherwise noted.)
COMMON-MODE REJECTION vs. TEMPERATURE
MAX4122/29-16
MAX4122-MAX4129
MINIMUM OUTPUT VOLTAGE vs. TEMPERATURE
MAX4122/29-17
MAXIMUM OUTPUT VOLTAGE vs. TEMPERATURE
RL TO VEE 250 VCC - VOUT (mV) 200 150 100 VCC = 2.7V, RL = 500 VCC = 6.5V, RL = 500
MAX4122/29-18
120 COMMON-MODE REJECTION (dB) 115 110 105 100 95 90 85 80 -40 -25 -10 5 20 35 50 65 80 VCM = 0.3V TO 5.3V VCM = 0.2V TO 5.2V VCM = 0V TO 5.0V
250 RL TO VCC 200 VOUT - VEE (mV) VCC = 6.5V, RL = 500
300
150 VCC = 2.7V, RL = 500 100
50
VCC = 6.5V, RL = 100k VCC = 2.7V, RL = 100k -40 -25 -10 5 20 35 50 65 80 95 TEMPERATURE (C)
50 0
VCC = 6.5V, RL = 100k (TOP) VCC = 2.7V, RL = 100k (BOTTOM) -40 -25 -10 5 20 35 50 65 80 95
0 95 TEMPERATURE (C)
TEMPERATURE (C)
LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE
MAX4122/29-19
LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE
MAX4122/29-20
LARGE-SIGNAL GAIN vs. TEMPERATURE
120 115 110 GAIN (dB) 105 100 95 90 85 80 VCC = 2.7V, RL TO VCC -40 -25 -10 5 20 35 50 65 80 95 VCC = 6.5V, RL TO VCC VCC = 2.7V, RL TO VEE RL = 500 VOUT(p-p) = VCC - 1V VCC = 6.5V, RL TO VEE
MAX4122/29-21
120 110 100 GAIN (dB) 90 80 70 60 0
VCC = 2.7V RL TO VEE
120 110 100 GAIN (dB) 90 80
RL = 100k
VCC = 6.5V RL TO VEE RL = 100k
125
RL = 10k RL = 2k RL = 500
RL = 10k RL = 2k
RL = 500 70 60 100 200 300 400 500 600 0 100 200 300 400 500 600 OUTPUT VOLTAGE: EITHER SUPPLY (mV) OUTPUT VOLTAGE: EITHER SUPPLY (mV)
75 TEMPERATURE (C)
LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE
MAX4122/29-22
LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE
MAX4122/29-23
LARGE-SIGNAL GAIN vs. TEMPERATURE
VCC = 6.5V, RL TO VEE VCC = 6.5V, RL TO VCC 120 115 110 GAIN (dB) 105 100 95 90 85 80 VCC = 2.7V, RL TO VEE VCC = 2.7V, RL TO VCC
MAX4122/29-24
120 110 100 GAIN (dB) 90 80 70 60 0 100 200 300 400 500 RL = 2k RL = 500 VCC = 2.7V RL TO VCC RL = 100k RL = 10k
120 110 100 GAIN (dB) 90
VCC = 6.5V RL TO VCC
125
RL = 100k RL = 10k RL = 2k
RL = 500 80 70 60
VOUT(p-p) = VCC - 600mV RL = 100k -40 -25 -10 5 20 35 50 65 80 95
75 0 100 200 300 400 500 600 OUTPUT VOLTAGE: EITHER SUPPLY (mV) TEMPERATURE (C)
600
OUTPUT VOLTAGE: EITHER SUPPLY (mV)
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7
Single/Dual/Quad, Wide-Bandwidth, Low-Power, Single-Supply Rail-to-Rail I/O Op Amps MAX4122-MAX4129
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0V, VCM = VCC/2, TA = +25C, unless otherwise noted.)
MAX4123 MINIMUM OPERATING VOLTAGE vs. TEMPERATURE
MAX4122/29-25
MAX4122/23/26/27/29 TOTAL HARMONIC DISTORTION AND NOISE vs. FREQUENCY
MAX4122/29-26
MAX4123 TOTAL HARMONIC DISTORTION AND NOISE vs. PEAK-TO-PEAK SIGNAL AMPLITUDE
AV = +1 10kHz SINEWAVE RL TO VCC/2 500kHz LOWPASS FILTER
MAX4122/29-27
1.9 MINIMUM OPERATING VOLTAGE (V) 1.8 1.7 1.6 1.5 1.4 1.3 1.2 -40 -25 -10 5 20 35 50 65 80
0.040 0.035 0.030 THD & NOISE (%) 0.025 0.020 0.015 0.010 0.005 0 AV = +1 2Vp-p SIGNAL 500kHz LOWPASS FILTER RL = 10k TO VCC/2
0.1
THD + N (%)
0.01
RL = 250
RL = 2k
RL = 10k 0.001 10 100 1k 10k FREQUENCY (Hz) 100k 4.0 4.2 4.4
RL = 100k
95
4.6
4.8
5.0
TEMPERATURE (C)
PEAK-TO-PEAK SIGNAL AMPLITUDE (V)
MAX4122/23/26/27/29 SMALL-SIGNAL TRANSIENT RESPONSE (NONINVERTING)
MAX4122/29-28
MAX4122/23/26/27/29 SMALL-SIGNAL TRANSIENT RESPONSE (INVERTING)
MAX4122/29-29
MAX4122/23/26/27/29 LARGE-SIGNAL TRANSIENT RESPONSE (NONINVERTING)
AV = +1
MAX4122/29-30
AV = +1
AV = -1
VOLTAGE (50mV/div)
VOLTAGE (50mV/div)
IN
IN VOLTAGE (2V/div) OUT
IN
OUT
OUT
TIME (200ns/div)
TIME (200ns/div)
TIME (2s/div)
MAX4122/23/26/27/29 LARGE-SIGNAL TRANSIENT RESPONSE (INVERTING)
MAX4122/29-34
MAX4124/25/28 SMALL-SIGNAL TRANSIENT RESPONSE (NONINVERTING)
MAX4122/29-31
MAX4124/25/28 SMALL-SIGNAL TRANSIENT RESPONSE (INVERTING)
AV = -10
MAX4122/29-32
AV = -1
AV = +10
IN (2V/div)
IN (5mV/div)
IN (5mV/div)
OUT (2V/div)
OUT (50mV/div)
OUT (50mV/div)
TIME (2s/div)
TIME (200ns/div)
TIME (200ns/div)
8
_______________________________________________________________________________________
Single/Dual/Quad, Wide-Bandwidth, Low-Power, Single-Supply Rail-to-Rail I/O Op Amps
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0V, VCM = VCC/2, TA = +25C, unless otherwise noted.)
MAX4124/25/28 LARGE-SIGNAL TRANSIENT RESPONSE (NONINVERTING)
MAX4122/29-33
MAX4122-MAX4129
MAX4124/25/28 LARGE-SIGNAL TRANSIENT RESPONSE (INVERTING)
AV = -10
MAX4122/29-35
AV = +10
IN (200mV/div)
IN (200mV/div)
OUT (2V/div)
OUT (2V/div)
TIME (2s/div)
TIME (2s/div)
Pin Description
PIN MAX4122 MAX4124 1 2 3 4 5 -- -- -- -- -- -- -- -- -- MAX4123 MAX4125 6 4 3 2 7 1, 5 8 -- -- -- -- -- -- -- MAX4126 MAX4128 -- 4 -- -- 8 -- -- 1, 7 2, 6 3, 5 -- -- -- -- NAME MAX4127 -- 4 -- -- 14 5, 7, 8, 10 -- 1, 13 2, 12 3, 11 6, 9 -- -- -- MAX4129 -- 11 -- -- 4 -- -- 1, 7 2, 6 3, 5 -- 8, 14 9, 13 10, 12 OUT VEE IN+ INVCC N.C. SHDN OUT1, OUT2 IN1-, IN2IN1+, IN2+ SHDN1, SHDN2 OUT3, OUT4 IN3-, IN4IN3+, IN4+ Output Negative Supply. Ground for single-supply operation. Noninverting Input Inverting Input Positive Supply No Connect Shutdown Control. Tie high or leave floating to enable amplifier. Outputs for Amps 1 and 2 Inverting Inputs for Amps 1 and 2 Noninverting Inputs for Amps 1 and 2 Shutdown Control for Amps 1 and 2. Tie high or leave floating to enable amplifier. Outputs for Amps 3 and 4 Inverting Inputs for Amps 3 and 4 Noninverting Inputs for Amps 3 and 4 FUNCTION
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9
Single/Dual/Quad, Wide-Bandwidth, Low-Power, Single-Supply Rail-to-Rail I/O Op Amps MAX4122-MAX4129
R3
MAX4122- MAX4129
R3
MAX4122- MAX4129
R3 = R1
R2
R3 = R1
R2
R1
R2
R1
R2
Figure 1a. Reducing Offset Error Due to Bias Current (Noninverting)
Figure 1b. Reducing Offset Error Due to Bias Current (Inverting)
1k
1k
Figure 2. Input Protection Circuit
10
______________________________________________________________________________________
Single/Dual/Quad, Wide-Bandwidth, Low-Power, Single-Supply Rail-to-Rail I/O Op Amps
Applications Information
Rail-to-Rail Input Stage
Devices in the MAX4122-MAX4129 family of highspeed amplifiers have rail-to-rail input and output stages designed for low-voltage single-supply operation. The input stage consists of separate NPN and PNP differential stages, which combine to provide an input common-mode range extending 0.2V beyond the supply rails. The PNP stage is active for input voltages close to the negative rail, and the NPN stage is active for input voltages near the positive rail. The input offset voltage is typically below 200V. The switchover transition region, which occurs near V CC / 2, has been extended to minimize the slight degradation in CMRR caused by the mismatch of the input pairs. Their low offset voltage, high bandwidth, and rail-to-rail commonmode range make these op amps excellent choices for precision low-voltage data-acquisition systems. Since the input stage switches between the NPN and PNP pairs, the input bias current changes polarity as the input voltage passes through the transition region. To reduce the offset error caused by input bias currents flowing through external source impedances, match the effective impedance seen by each input (Figures 1a, 1b). High source impedances, together with the input capacitance, can create a parasitic pole that produces an underdamped signal response. Reducing the input impedance or placing a small (2pF to 10pF) capacitor across the feedback resistor improves the response. The MAX4122-MAX4129's inputs are protected from large differential input voltages by 1k series resistors and back-to-back triple diodes across the inputs (Figure 2). For differential input voltages less than 1.8V the input resistance is typically 500k. For differential input voltages greater than 1.8V the input resistance is approximately 2k, and the input bias current is determined by the following equation: IBIAS = VDIFF - 1.8V 2k
VOLTAGE (1V/div) IN VCC = 3V AV = +1
MAX4122-MAX4129
OUT
TIME (2s/div)
Figure 3. Rail-to-Rail Input /Output Voltage Range
10,000
CAPACITIVE LOAD (pF)
UNSTABLE REGION
1000
RL TO VEE VOUT = VCC/2 100 100 1k 10k 100k RESISTIVE LOAD ()
Figure 4. Capacitive-Load Stability
Rail-to-Rail Output Stage
The minimum output voltage will be within millivolts of ground for single-supply operation where the load is referenced to ground (VEE). Figure 3 shows the input voltage range and output voltage swing of a MAX4123 connected as a voltage follower. With a +3V supply and the load tied to ground, the output swings from
0.00V to 2.90V. The maximum output voltage swing depends on the load, but will be within 150mV of a +3V supply, even with the maximum load (500 to ground). Driving a capacitive load can cause instability in most high-speed op amps, especially those with low quiescent current. The MAX4122-MAX4129 have a high tolerance for capacitive loads. They are stable with capacitive loads up to 500pF. Figure 4 gives the stable operating region for capacitive loads. Figures 5-8 show the response with capacitive loads, and the results of adding an isolation resistor in series with the output (Figure 9). The resistor improves the circuit's phase margin by isolating the load capacitor from the op amp's output.
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11
Single/Dual/Quad, Wide-Bandwidth, Low-Power, Single-Supply Rail-to-Rail I/O Op Amps MAX4122-MAX4129
AV = +1 CL = 500pF VOLTAGE (50mV/div) IN VOLTAGE IN (5mV/div) AV = +10 CL = 500pF
OUT
OUT (50mV/div)
TIME (400ns/div)
TIME (1s/div)
Figure 5. MAX4122/23/26/27/29 Small-Signal Transient Response with Capacitive Load
Figure 6. MAX4124/25/28 Small-Signal Transient Response with Capacitive Load
VOLTAGE (50mV/div)
IN
AV = +1 CL = 1000pF RS = 39 IN (5mV/div) VOLTAGE
AV = +10 CL = 1000pF RS = 56
OUT
OUT (50mV/div)
TIME (400ns/div)
TIME (1s/div)
Figure 7. MAX4122/23/26/27/29 Transient Response to Capacitive Load with Isolation Resistor
Figure 8. MAX4124/25/28 Transient Response to Capacitive Load with Isolation Resistor
VCC 0V TO 2.7V STEP FOR POWER-UP TEST. 2.7V 2k FOR SHUTDOWN ENABLE TEST. SHDN CL 0V TO 2.7V STEP FOR SHUTDOWN TEST 10k SUPPLY-CURRENT MONITORING POINT
RS
VOUT
2k
10
Figure 9. Capacitive-Load-Driving Circuit
12
Figure 10. Power-Up/Shutdown Test Circuit
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Single/Dual/Quad, Wide-Bandwidth, Low-Power, Single-Supply Rail-to-Rail I/O Op Amps MAX4122-MAX4129
VCC VOLTAGE (1V/div)
VCC (1V/div)
OUT
ICC (500A/div)
TIME (5s/div)
TIME (5s/div)
Figure 11. Power-Up Output Voltage
Figure 12. Power-Up Supply Current
VCC = 2.7V RL = 10k SHDN (1V/div) SHDN (1V/div)
VCC = 2.7V
OUT (0.5V/div)
ICC (500A/div)
TIME (2s/div)
TIME (2s/div)
Figure 13. Shutdown Output Voltage
Figure 14. Shutdown Enable/Disable Supply Current
Power-Up and Shutdown Mode
The MAX4122-MAX4129 amplifiers typically settle within 1s after power-up. Using the test circuit of Figure 10, Figures 11 and 12 show the output voltage and supply current on power-up. The MAX4123, MAX4125, and MAX4127 have a shutdown option. When the shutdown pin (SHDN) is pulled low, the supply current drops below 25A per amplifier and the amplifiers are disabled with the outputs in a high-impedance state. Pulling SHDN high or leaving it floating enables the amplifier. In the dual-amplifier MAX4129, the shutdown functions operate independently. Figures 13 and 14 show the output voltage and supply current responses of the MAX4123 to a shutdown pulse.
Power Supplies and Layout
The MAX4122-MAX4129 operate from a single +2.7V to +6.5V power supply, or from dual supplies of 1.35V to 3.25V. For single-supply operation, bypass the power supply with a 0.1F ceramic capacitor in parallel with at least 1F. For dual supplies, bypass each supply to ground. Good layout improves performance by decreasing the amount of stray capacitance at the op amp's inputs and outputs. To decrease stray capacitance, minimize trace lengths and resistor leads by placing external components close to the op amp's pins.
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13
Single/Dual/Quad, Wide-Bandwidth, Low-Power, Single-Supply Rail-to-Rail I/O Op Amps MAX4122-MAX4129
Pin Configurations
TOP VIEW
OUT 1
5
VCC
VEE 2
MAX4122 MAX4124
4 IN-
IN+ 3
SOT23-5
N.C. 1 IN1- 2 IN1+ 3 VEE 4
8
SHDN VCC OUT N.C.
OUT1 1 IN1- 2 IN1+ 3 VEE 4
8
VCC OUT2 IN2IN2+
MAX4123 MAX4125
7 6 5
MAX4126 MAX4128
7 6 5
SO/MAX
SO/MAX
OUT1 1 IN1- 2 IN1+ 3 VEE 4 N.C. 5 SHDN1 6 N.C. 7
14 VCC 13 OUT2 12 IN2-
OUT1 1 IN1- 2 IN1+ 3 VCC 4 IN2+ 5 IN2- 6 OUT2 7
14 OUT4 13 IN412 IN4+
MAX4127
11 IN2+ 10 N.C. 9 8 SHDN2 N.C.
MAX4129
11 VEE 10 IN3+ 9 8 IN3OUT3
SO
SO
14
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Single/Dual/Quad, Wide-Bandwidth, Low-Power, Single-Supply Rail-to-Rail I/O Op Amps MAX4122-MAX4129
Ordering Information (continued)
PART TEMP. RANGE PINPACKAGE 5 SOT23-5 8 SO 8 MAX 8 SO 8 MAX Dice* 14 SO 8 SO 8 MAX 14 SO MARKING INFO. AABA -- -- -- -- -- -- -- -- --
MAX4124EUK -40C to +85C MAX4125ESA -40C to +85C MAX4125EUA -40C to +85C MAX4126ESA -40C to +85C MAX4126EUA -40C to +85C MAX4127C/D 0C to +70C MAX4127ESD -40C to +85C MAX4128ESA -40C to +85C MAX4128EUA -40C to +85C MAX4129ESD -40C to +85C
*Dice are specified at TA = +25C, DC parameters only.
__________________________________________________________Chip Topographies
MAX4123/ MAX4125
V EE ININ1SHDN iN+ OUT1
MAX4127/ MAX4128
V CC OUT2
0.055" (1.397mm) IN1+
0.066" (1.676mm) IN2-
V EE
V CC
V EE
IN2+
OUT 0.036" (0.914mm) V CC SHDN1 SHDN2 0.053" (1.346mm) V EE V CC
TRANSISTOR COUNT: 170 SUBSTRATE CONNECTED TO VEE
TRANSISTOR COUNT: 340 SUBSTRATE CONNECTED TO VEE
15
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Single/Dual/Quad, Wide-Bandwidth, Low-Power, Single-Supply Rail-to-Rail I/O Op Amps MAX4122-MAX4129
________________________________________________________Package Information
SOT5L.EPS
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.
16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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