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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® operation at the inputs and outputs. These
devices require only 650µA 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 capa-
ble of driving 250loads. The MAX4122/MAX4123/
MAX4126/MAX4127/MAX4129 have a 5MHz gain band-
width 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 25µA 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 operat-
ing 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-condition-
ing stages for precision, low-voltage, data-acquisition
systems. The MAX4122 and MAX4124 come in the
space-saving 5-pin SOT23-5 package.
________________________Applications
Battery-Powered Instruments
Portable Equipment
Data-Acquisition Systems
Signal Conditioning
Low-Power, Low-Voltage Applications
Selection Table
PART
BW
(MHz)
MAX4122
MAX4123
MAX4124
MAX4125
MAX4126
MAX4127
MAX4128
MAX4129
5
5
25
25
5
5
25
5
AMPS
PER
PKG.
1
1
1
1
2
2
2
4
SHUT-
DOWN
MODE
Yes
Yes
Yes
PIN-
PACKAGE
5 SOT23-5
8 SO/µMAX
5 SOT23-5
8 SO/µMAX
8 SO/µMAX
14 SO
8 SO/µMAX
14 SO
Features
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 650µA Quiescent Current per Amplifier
o 25µA Shutdown Function (MAX4123/5/7)
o 200µV Offset Voltage
o No Phase Reversal for Overdriven Inputs
o Drive 250Loads
o Stable with 500pF Capacitive Loads
o Unity-Gain Stable (MAX4122/3/6/7/9)
Stable at Gains 10V/V (MAX4124/5/8)
Ordering Information
PART
TEMP. RANGE
PIN-
PACKAGE
MARKING
INFO.
MAX4122EUK -40°C to +85°C 5 SOT23-5
AAAZ
MAX4123C/D 0°C to +70°C Dice*
MAX4123ESA -40°C to +85°C 8 SO
MAX4123EUA -40°C to +85°C 8 µMAX
Ordering Information continued at end of data sheet.
*Dice are specified at TA = +25°C, DC parameters only.
Pin Configurations appear at end of data sheet.
__________Typical Operating Circuit
+5V
SERIAL
INTERFACE
MAX187
3 SHDN
VDD 1
6 DOUT
AIN 2
8 SCLK
VREF 4
7 CS
GND 5
MAX4123
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.

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Single/Dual/Quad, Wide-Bandwidth, Low-Power,
Single-Supply Rail-to-Rail I/O Op Amps
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 = +70°C)
5-pin SOT23-5 (derate 7.1mW/°C above +70°C) .........571mW
8-pin SO (derate 5.88mW/°C above +70°C).................471mW
8-pin µMAX (derate 4.10mW/°C above +70°C) ............330mW
14-pin SO (derate 8.00mW/°C above +70°C)...............640mW
Operating Temperature Range
MAX412_E__ ....................................................-40°C to +85°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
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, VEE = 0V, VCM = 0V, VOUT = VCC/2, RL tied to VCC/2, SHDN 2V (or open), TA = +25°C, unless
otherwise noted.)
PARAMETER
Input Offset Voltage
Input Bias Current
Input Offset Current
Differential Input Resistance
Common-Mode Input
Voltage Range
CONDITIONS
MAX4123ESA/MAX4125ESA
MAX4122EUK/MAX4124EUK
VCM =
MAX4123EUA/MAX4125EUA
VEE to VCC MAX4126ESA/MAX4127ESD/MAX4128ESA
MAX4126EUA/MAX4128EUA
MAX4129ESD
VCM = VEE to VCC
VCM = VEE to VCC
-1.5V < VDIFF < 1.5V
MIN
VEE -
0.25
TYP
±0.20
±0.35
±0.35
±0.25
±0.40
±0.35
±50
±1
500
MAX
±0.60
±1.50
±1.20
±0.75
±1.50
±1.50
±150
±12
VCC +
0.25
UNITS
mV
nA
nA
k
V
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Output Resistance
Off-Leakage Current
Large-Signal Voltage Gain
MAX4123ESA/MAX4125ESA
(VEE -
0.25) <
VCM <
(VCC +
0.25V)
MAX4122EUK/MAX4124EUK
MAX4123EUA/MAX4125EUA
MAX4126ESA/MAX4127ESD/MAX4128ESA
MAX4126EUA/MAX4128EUA
MAX4129ESD
VCC = 2.7V to 6.5V
AV = 1
SHDN < 0.8V, VOUT = 0V to VCC
VCC = 2.7V
VOUT = 0.25V to 2.45V, RL = 100k
VOUT = 0.4V to 2.3V, RL = 250
VCC = 5V
VOUT = 0.25V to 4.75V, RL = 100k
VOUT = 0.4V to 4.6V, RL = 250
78
67
68
74
66
64
78
92
72
94
75
98
90
88
94
86
84
100
0.1
±0.1
104
80
106
84
±1
dB
dB
µA
dB
2 _______________________________________________________________________________________

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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, VEE = 0V, VCM = 0V, VOUT = VCC/2, RL tied to VCC/2, SHDN 2V (or open), TA = +25°C, unless
otherwise noted.)
PARAMETER
Output Voltage Swing
Output Short-Circuit Current
CONDITIONS
MAX4122/
MAX4123/
MAX4124/
MAX4125
RL = 100k
RL = 250
MAX4126/
MAX4127/
MAX4128/
MAX4129
RL = 100k
RL = 250
SHDN Logic Threshold
MAX4123/MAX4125/MAX4127
SHDN Input Current
MAX4123/MAX4125/MAX4127
Operating Supply-Voltage Range
Supply Current per Amplifier
VCM = VOUT = VCC/2
Shutdown Supply Current
per Amplifier
SHDN > 0.8V,
MAX4123/MAX4125/MAX4127
VCC - VOH
VOL - VEE
VCC - VOH
VOL - VEE
VCC - VOH
VOL - VEE
VCC - VOH
VOL - VEE
MIN
Low
High
2.0
VCC = 2.7V
VCC = 5V
VCC = 2.7V
VCC = 5V
2.7
TYP
12
20
240
125
15
25
280
180
50
±1
650
725
25
40
MAX
20
35
290
170
30
40
330
230
0.8
UNITS
mV
mA
V
±3 µA
6.5 V
750
µA
825
40
µA
60
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 = -40°C to +85°C, unless
otherwise noted.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
MAX4123ESA/MAX4125ESA
±0.75
MAX4122EUK/MAX4124EUK
±3.50
Input Offset Voltage
VCM =
MAX4123EUA/MAX4125EUA
VEE to VCC MAX4126ESA/MAX4127ESD/MAX4128ESA
±4.40
±0.95
mV
MAX4126EUA/MAX4128EUA
±4.70
MAX4129ESD
±4.00
Input Offset Voltage Tempco
±2 µV/°C
Input Bias Current
Input Offset Current
VCM = VEE to VCC
VCM = VEE to VCC
±160
±18
nA
nA
Common-Mode Input
Voltage Range
VEE -
0.20
VCC +
0.20
V
MAX4123ESA/MAX4125ESA
76
Common-Mode Rejection Ratio
(VEE -
0.2V) <
VCM <
(VCC +
0.2V)
MAX4122EUK/MAX4124EUK
MAX4123EUA/MAX4125EUA
MAX4126ESA/MAX4127ESD/MAX4128ESA
MAX4126EUA/MAX4128EUA
MAX4129ESD
62
60
74
58
60
dB
_______________________________________________________________________________________ 3

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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, VEE = 0V, VCM = 0V, VOUT = VCC/2, RL tied to VCC/2, SHDN 2V (or open), TA = -40°C to +85°C, unless
otherwise noted.)
PARAMETER
Power-Supply Rejection Ratio
Off-Leakage Current
Large-Signal Voltage Gain
Output Voltage Swing
SHDN Logic Threshold
SHDN Input Current
Operating Supply-Voltage Range
Supply Current per Amplifier
Shutdown Supply Current
per Amplifier
CONDITIONS
VCC = 2.7V to 6.5V
SHDN < 0.8V, VOUT = 0V to VCC
VCC = 2.7V
VOUT = 0.25V to 2.45V, RL = 100k
VOUT = 0.4V to 2.3V, RL = 250
VCC = 5V
VOUT = 0.25V to 4.75V, RL = 100k
VOUT = 0.4V to 4.6V, RL = 250
MAX4122/
MAX4123/
MAX4124/
MAX4125
RL = 100k
RL = 250
VCC - VOH
VOL - VEE
VCC - VOH
VOL - VEE
MAX4126/
MAX4127/
MAX4128/
MAX4129
RL = 100k
RL = 250
VCC - VOH
VOL - VEE
VCC - VOH
VOL - VEE
MAX4123/MAX4125/MAX4127
Low
High
MAX4123/MAX4125/MAX4127
VCM = VOUT = VCC/2
SHDN < 0.8V,
MAX4123/MAX4125/MAX4127
VCC = 2.7V
VCC = 5V
VCC = 2.7V
VCC = 5V
MIN
74
84
66
86
68
2.0
2.7
TYP
MAX
±12
UNITS
dB
µA
dB
25
40
300
190
mV
35
50
350
250
0.8
V
±3 µA
6.5 V
775
µA
850
50
µA
70
AC ELECTRICAL CHARACTERISTICS
(VCC = +2.7V to +6.5V, VEE = 0V, SHDN 2V (or open), TA = +25°C, unless otherwise noted.)
PARAMETER
Gain-Bandwidth Product
Phase Margin
Gain Margin
Total Harmonic Distortion
Slew Rate
Settling Time to 0.01%
Turn-On Time
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/µs
µs
µs
4 _______________________________________________________________________________________

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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 = +25°C, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
SHDN Delay
VCC = 3V, VOUT = VCC/2,
MAX4123/25/27
Enable
Disable
1
µs
0.2
Input Capacitance
Input Noise Voltage Density
Input Noise Current Density
f = 1kHz
f = 1kHz
3 pF
22 nV/Hz
0.4 pA/Hz
Amp-Amp Isolation
MAX4126/27/28/29
135 dB
Capacitive Load Stability
MAX4122/23/26/27/29 (AV = 1)
MAX4124/25/28 (AV 10)
500
pF
500
__________________________________________Typical Operating Characteristics
(VCC = +5V, VEE = 0V, VCM = VCC/2, TA = +25°C, unless otherwise noted.)
MAX4322/26/29
GAIN AND PHASE vs. FREQUENCY
60 180MAX4322/26/29-01
144
40 AV = +1000
108
NO LOAD
GAIN 72
20 36
0
0 PHASE
-36
-72
-20 -108
-144
-40 -180
100 1k 10k 100k 1M 10M 100M
FREQUENCY (Hz)
MAX4122/23/26/27/29
GAIN AND PHASE vs. FREQUENCY
(WITH CLOAD)
60 180MAX4122/29-02
40
AV = +1000
RL =
CL = 500pF
GAIN
144
108
72
20 36
0
0
PHASE
-36
-72
-20 -108
-144
-40 -180
100 1k 10k 100k 1M 10M 100M
FREQUENCY (Hz)
MAX4122/23/26/27/29
POWER-SUPPLY REJECTION
vs. FREQUENCY
0 AV = +1
-20
-40
-60
-80
-100
10 100 1k 10k 100k 1M 10M 100M
FREQUENCY (Hz)
MAX4124/25/28
GAIN AND PHASE vs. FREQUENCY
60 180MAX14122/29-04
40
AV = +1000
NO LOAD
144
GAIN
108
72
20 36
0
PHASE
0 -36
-72
-20 -108
-144
-40
100
1k 10k 100k 1M
FREQUENCY (Hz)
-180
10M
MAX4124/25/28
GAIN AND PHASE vs. FREQUENCY
(WITH CLOAD)
60 180MAX4122/29-05
40
AV = +1000
RL =
CL = 500 pF
144
108
GAIN
72
20 36
PHASE
0
0
-36
-72
-20 -108
-144
-40 -180
100 1k 10k 100k 1M 10M 100M
FREQUENCY (Hz)
MAX4124/25/28
POWER-SUPPLY REJECTION
vs. FREQUENCY
0 AV = +10
-20
-40
-60
-80
-100
10 100 1k 10k 100k 1M 10M 100M
FREQUENCY (Hz)
_______________________________________________________________________________________ 5