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 250Ωloads. 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
Features
♦5-Pin SOT23 Package (MAX4122/4)
♦+2.7V to +6.5V Single-Supply Operation
♦Rail-to-Rail Input Common-Mode Voltage Range
♦Rail-to-Rail Output Voltage Swing
♦5MHz Gain-Bandwidth Product (MAX4122/3/6/7/9)
25MHz Gain-Bandwidth Product (MAX4124/5/8)
♦650µA Quiescent Current per Amplifier
♦25µA Shutdown Function (MAX4123/5/7)
♦200µV Offset Voltage
♦No Phase Reversal for Overdriven Inputs
♦Drive 250ΩLoads
♦Stable with 500pF Capacitive Loads
♦Unity-Gain Stable (MAX4122/3/6/7/9)
Stable at Gains ≥10V/V (MAX4124/5/8)
MAX4122–MAX4129
Single/Dual/Quad, Wide-Bandwidth, Low-Power,
Single-Supply Rail-to-Rail I/O Op Amps
________________________________________________________________
Maxim Integrated Products
1
MAX187
MAX4123
SHDN
31
2
4
5
6
8
7
VDD
+5V
AIN
VREF
GND
DOUT
SERIAL
INTERFACE SCLK
CS
__________Typical Operating Circuit
Selection Table
19-1087; Rev 1; 8/97
PART
MAX4122EUK
MAX4123C/D
MAX4123ESA -40°C to +85°C
0°C to +70°C
-40°C to +85°C
TEMP. RANGE PIN-
PACKAGE
5 SOT23-5
Dice*
8 SO
Ordering Information
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.
MARKING
INFO.
AAAZ
—
—
BW
(MHz)
AMPS
PER
PKG.
MAX4122 5 1
MAX4123 5 1
PART
MAX4124 25 1
MAX4125 25 1
MAX4126 5 2
MAX4127 5 2
MAX4128 25 2
MAX4129 5 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
MAX4123EUA -40°C to +85°C 8 µMAX —
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.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
MAX4122–MAX4129
Single/Dual/Quad, Wide-Bandwidth, Low-Power,
Single-Supply Rail-to-Rail I/O Op Amps
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(VCC = +2.7V to +6.5V, VEE = 0V, VCM = 0V, VOUT = VCC/2, RLtied to VCC/2, SHDN ≥2V (or open), TA= +25°C, unless
otherwise noted.)
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.
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
VCM = VEE to VCC
MAX4123ESA/MAX4125ESA
CONDITIONS
nA±1 ±12Input Offset Current nA±50 ±150Input Bias Current
72 80
Ω0.1Output Resistance
kΩ500Differential Input Resistance
78 98
dB78 100Power-Supply Rejection Ratio
UNITSMIN TYP MAXPARAMETER
VOUT = 0.4V to 4.6V, RL= 250Ω75 84
dBLarge-Signal Voltage Gain
V
VEE - VCC +
0.25 0.25
Common-Mode Input
Voltage Range
Note 1: Provided that the maximum package power-dissipation rating is met.
MAX4122EUK/MAX4124EUK ±0.35 ±1.50
MAX4123EUA/MAX4125EUA ±0.35 ±1.20
±0.20 ±0.60
MAX4126ESA/MAX4127ESD/MAX4128ESA
MAX4126EUA/MAX4128EUA ±0.40 ±1.50
MAX4129ESD ±0.35 ±1.50
Input Offset Voltage ±0.25 ±0.75
VCM =
VEE to VCC
MAX4123ESA/MAX4125ESA
mV
VCM = VEE to VCC
-1.5V < VDIFF < 1.5V
VCC = 2.7V to 6.5V
AV= 1
SHDN < 0.8V, VOUT = 0V to VCC µA±0.1 ±1Off-Leakage Current
MAX4122EUK/MAX4124EUK
(VEE -
0.25) <
VCM <
(VCC +
0.25V)
67 90
Common-Mode Rejection Ratio
MAX4129ESD
MAX4126EUA/MAX4128EUA 64 84
dB
66 86
MAX4126ESA/MAX4127ESD/MAX4128ESA
MAX4123EUA/MAX4125EUA 74 94
68 88
VCC = 5V
VOUT = 0.4V to 2.3V, RL= 250Ω
VOUT = 0.25V to 2.45V, RL= 100kΩ
VOUT = 0.25V to 4.75V, RL= 100kΩ
VCC = 2.7V 92 104
94 106
MAX4122–MAX4129
Single/Dual/Quad, Wide-Bandwidth, Low-Power,
Single-Supply Rail-to-Rail I/O Op Amps
_______________________________________________________________________________________ 3
DC ELECTRICAL CHARACTERISTICS
(VCC = +2.7V to +6.5V, VEE = 0V, VCM = 0V, VOUT = VCC/2, RLtied to VCC/2, SHDN ≥2V (or open), TA= -40°C to +85°C, unless
otherwise noted.)
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +2.7V to +6.5V, VEE = 0V, VCM = 0V, VOUT = VCC/2, RLtied to VCC/2, SHDN ≥2V (or open), TA= +25°C, unless
otherwise noted.)
RL= 100kΩ
CONDITIONS
20 35
Low
V2.7 6.5Operating Supply-Voltage Range
SHDN > 0.8V,
MAX4123/MAX4125/MAX4127
240 290
12 20
VOL - VEE 125 170
MAX4122/
MAX4123/
MAX4124/
MAX4125
V
0.8 mA50Output Short-Circuit Current
µA
40 60
Shutdown Supply Current
per Amplifier
UNITS
MIN TYP MAX
PARAMETER VCC - VOH
VOL - VEE
VCC - VOH
RL= 250Ω
VCC - VOH
VOL - VEE
VCC - VOH
RL= 250Ω
RL= 100kΩ25 40
mV
280 330
15 30
VOL - VEE
Output Voltage Swing
180 230
MAX4126/
MAX4127/
MAX4128/
MAX4129
High 2.0
SHDN Logic Threshold MAX4123/MAX4125/MAX4127
VCC = 5V
MAX4123/MAX4125/MAX4127 µA±1 ±3
SHDN Input Current
VCC = 2.7V
VCM = VOUT = VCC/2 µA
650 750
VCC = 5V 725 825
Supply Current per Amplifier
VCC = 2.7V 25 40
MAX4122EUK/MAX4124EUK
(VEE -
0.2V) <
VCM <
(VCC +
0.2V)
MAX4123ESA/MAX4125ESA
MAX4129ESD
MAX4122EUK/MAX4124EUK
MAX4123ESA/MAX4125ESA
CONDITIONS
±3.50
62
VCM = VEE to VCC
MAX4123EUA/MAX4125EUA
V
VEE - VCC +
0.20 0.20
Common-Mode Input
Voltage Range
mV
±4.40
±0.75
MAX4126ESA/MAX4127ESD/MAX4128ESA
MAX4126EUA/MAX4128EUA ±4.70
MAX4129ESD
Common-Mode Rejection Ratio
±4.00
Input Offset Voltage ±0.95
VCM =
VEE to VCC
nA±18
MAX4126EUA/MAX4128EUA
Input Offset Current
µV/°C±2
60
dB
58
MAX4126ESA/MAX4127ESD/MAX4128ESA
Input Offset Voltage Tempco
MAX4123EUA/MAX4125EUA 74
60
76
UNITSMIN TYP MAXPARAMETER
VCM = VEE to VCC nA±160Input Bias Current
MAX4122–MAX4129
Single/Dual/Quad, Wide-Bandwidth, Low-Power,
Single-Supply Rail-to-Rail I/O Op Amps
4 _______________________________________________________________________________________
86
Large-Signal Voltage Gain
68
VOUT = 0.25V to 4.75V, RL= 100kΩ
VOUT = 0.4V to 4.6V, RL= 250Ω
VCC = 5V
84
dB
66
VOUT = 0.25V to 2.45V, RL= 100kΩ
VOUT = 0.4V to 2.3V, RL= 250Ω
VCC = 2.7V
Off-Leakage Current ±12 µA
SHDN < 0.8V, VOUT = 0V to VCC
MAX4122/
MAX4123/
MAX4124/
MAX4125 190VOL - VEE
25
300
MAX4126/
MAX4127/
MAX4128/
MAX4129 250
Output Voltage Swing
VOL - VEE
35
350
mV
50
RL= 100kΩ
RL= 250ΩVCC - VOH
VOL - VEE
VCC - VOH
40
RL= 100kΩ
RL= 250ΩVCC - VOH
VOL - VEE
VCC - VOH
PARAMETER MIN TYP MAX UNITS
Shutdown Supply Current
per Amplifier 70 µA
Power-Supply Rejection Ratio 74 dB
0.8 V
SHDN < 0.8V,
MAX4123/MAX4125/MAX4127
Operating Supply-Voltage Range 2.7 6.5 V
775 µAVCM = VOUT = VCC/2 VCC = 2.7V
SHDN Input Current
Low
±3
CONDITIONS
µA
50
MAX4123/MAX4125/MAX4127
VCC = 2.7V to 6.5V
VCC = 2.7V
VCC = 5V
MAX4123/MAX4125/MAX4127
Supply Current per Amplifier
SHDN Logic Threshold
850
2.0High
VCC = 5V
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +2.7V to +6.5V, VEE = 0V, VCM = 0V, VOUT = VCC/2, RLtied to VCC/2, SHDN ≥2V (or open), TA= -40°C to +85°C, unless
otherwise noted.)
f = 10kHz, VOUT = 2Vp-p,
MAX4122/23/26/27/29 (AV= 1)
MAX4124/25/28 (AV≥10), VOUT = 2V step
MAX4122/23/26/27/29
VCC = 0V to 3V step, VOUT = VCC/2
64
MAX4124/25/28 (AV≥10)
MAX4124/25/28 (AV≥10) degrees
MAX4122/23/26/27/29 (AV= 1), VOUT = 2V step
MAX4122/23/26/27/29
CONDITIONS
MAX4122/23/26/27/29
µs
1.3
60
5
Phase Margin
MAX4124/25/28 (AV≥10)
MAX4122/23/26/27/29
MHz
25
Gain-Bandwidth Product
12
MAX4124/25/28 (AV≥10)
%0.003
dB
Total Harmonic Distortion
10
Gain Margin
Settling Time to 0.01% 2.0
µs1Turn-On Time
V/µs
10
Slew Rate 2
UNITSMIN TYP MAXPARAMETER
AC ELECTRICAL CHARACTERISTICS
(VCC = +2.7V to +6.5V, VEE = 0V, SHDN ≥2V (or open), TA= +25°C, unless otherwise noted.)
MAX4122–MAX4129
Single/Dual/Quad, Wide-Bandwidth, Low-Power,
Single-Supply Rail-to-Rail I/O Op Amps
_______________________________________________________________________________________ 5
60
-40100 1k 10k 1M 10M100k 100M
MAX4322/26/29
GAIN AND PHASE vs. FREQUENCY
-20
FREQUENCY (Hz)
GAIN (dB)
0
20
40
PHASE
GAIN
AV = +1000
NO LOAD
PHASE (DEGREES)
180
144
72
0
-72
-144
-180
-108
-36
36
108
MAX4322/26/29-01
60
-40100 1k 10k 1M 10M100k 100M
MAX4122/23/26/27/29
GAIN AND PHASE vs. FREQUENCY
(WITH CLOAD)
-20
MAX4122/29-02
FREQUENCY (Hz)
GAIN (dB)
0
20
40
PHASE
GAIN
AV = +1000
RL = ∞
CL = 500pF
PHASE (DEGREES)
180
144
72
0
-72
-144
-180
-108
-36
36
108
0
-100
10 100 1k 100k 1M 10M10k 100M
MAX4122/23/26/27/29
POWER-SUPPLY REJECTION
vs. FREQUENCY
-80
MAX4122/29-03
FREQUENCY (Hz)
PSR (dB)
-60
-40
-20
AV = +1
__________________________________________Typical Operating Characteristics
(VCC = +5V, VEE = 0V, VCM = VCC/2, TA = +25°C, unless otherwise noted.)
AC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +2.7V to +6.5V, VEE = 0V, SHDN ≥2V (or open), TA= +25°C, unless otherwise noted.)
MAX4124/25/28 (AV≥10)
MAX4122/23/26/27/29 (AV= 1)
MAX4126/27/28/29
f = 1kHz
f = 1kHz
VCC = 3V, VOUT = VCC/2,
MAX4123/25/27
CONDITIONS
pF
500
Capacitive Load Stability 500 dB135Amp-Amp Isolation pA/√Hz
0.4Input Noise Current Density nV/√Hz
22Input Noise Voltage Density pF3Input Capacitance
µs
0.2
SHDN Delay 1UNITSMIN TYP MAXPARAMETER Enable
Disable
60
-40100 1k 10k 100k 1M 10M
MAX4124/25/28
GAIN AND PHASE vs. FREQUENCY
-20
MAX14122/29-04
FREQUENCY (Hz)
GAIN (dB)
PHASE (DEGREES)
0
20
40
180
144
-180
-144
-108
-72
-36
36
0
108
72
AV = +1000
NO LOAD GAIN
PHASE
60
-40100 1k 10k 1M 10M100k 100M
MAX4124/25/28
GAIN AND PHASE vs. FREQUENCY
(WITH CLOAD)
-20
MAX4122/29-05
FREQUENCY (Hz)
GAIN (dB)
0
20
40
PHASE
GAIN
AV = +1000
RL = ∞
CL = 500 pF
PHASE (DEGREES)
180
144
72
0
-72
-144
-180
-108
-36
36
108
0
-100
10 100 1k 100k 1M 10M10k 100M
MAX4124/25/28
POWER-SUPPLY REJECTION
vs. FREQUENCY
-80
MAX4122/29-06
FREQUENCY (Hz)
PSR (dB)
-60
-40
-20
AV = +10
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0V, VCM = VCC/2, TA = +25°C, unless otherwise noted.)
MAX4122–MAX4129
Single/Dual/Quad, Wide-Bandwidth, Low-Power,
Single-Supply Rail-to-Rail I/O Op Amps
6 _______________________________________________________________________________________
1k 10k 10M
FREQUENCY (Hz)
100k 1M100
130
50
60
70
80
90
100
110
120
MAX4126/27/28/29
CHANNEL SEPARATION vs. FREQUENCY
MAX4122/29-07
CHANNEL SEPARATION (dB)
100
0.01100 1k 100k 1M 10M
10k 100M
MAX4122/23/26/27/29
OUTPUT IMPEDANCE
vs. FREQUENCY
0.1
MAX4122/29-08
FREQUENCY (Hz)
OUTPUT IMPEDANCE (Ω)
1
10
AV = +1
100
0.1100 1k 100k 1M 10M
10k 100M
MAX4124/25/28
OUTPUT IMPEDANCE
vs. FREQUENCY
MAX4122/29-09
FREQUENCY (Hz)
OUTPUT IMPEDANCE (Ω)
1
10
AV = +10
900
500
550
600
650
700
750
800
850
-40 -25 -10 5 20 35 50 65 80 95
SUPPLY CURRENT PER AMPLIFIER
vs. TEMPERATURE
MAX4122/29-10
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
VCC = 6.5V
VCC = 2.7V
0
10
20
30
40
50
60
-40 -25 -10 5 20 35 50 65 80 95
MAX4323/MAX4327
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX4322-11
TEMPERATURE (°C)
SHUTDOWN SUPPLY CURRENT (mA)
VCC = 6.5V
VCC = 2.7V
SHDN = 0V
-10
-5
0
5
10
15
20
-40 -25 -10 5 20 35 50 65 80 95
OUTPUT LEAKAGE CURRENT
vs. TEMPERATURE
MAX4122/29-12
TEMPERATURE (°C)
LEAKAGE CURRENT (µA)
VCC = 6.5V
VOUT SHORT
TO VCC VCC = 2.7V
VCC = 6.5V
VOUT SHORT
TO VEE VCC = 2.7V
AV = +1
SHDN = 0V
-3.00
-2.25
-0.75
-1.50
0
1.50
0.75
2.25
3.00
-40 -25 -10 5 20 35 50 65 80 95
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
MAX4122/29-13
TEMPERATURE (°C)
VOLTAGE (mV)
SOT23-5
PACKAGE
SO PACKAGE
-50 0123456
INPUT BIAS CURRENT
vs. COMMON-MODE VOLTAGE
MAX4122/29-14
COMMON-MODE VOLTAGE (V)
INPUT BIAS CURRENT (nA)
-40
-30
-20
-10
0
10
20
30
40
50
VCC = 2.7V
VCC = 6.5V
-60
-50
-40 -25 -10 5 20 35 50 65 80 95
INPUT BIAS CURRENT
vs. TEMPERATURE
MAX4122/29-15
TEMPERATURE (°C)
INPUT BIAS CURRENT (nA)
-40
-30
-20
-10
0
10
20
30
40
50
VCC = 6.5V, VCM = VCC
VCC = 2.7V, VCM = VEE
VCC = 2.7V, VCM = VCC
VCC = 6.5V, VCM = VEE
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0V, VCM = VCC/2, TA = +25°C, unless otherwise noted.)
MAX4122–MAX4129
Single/Dual/Quad, Wide-Bandwidth, Low-Power,
Single-Supply Rail-to-Rail I/O Op Amps
_______________________________________________________________________________________
7
120
80
85
90
95
100
105
110
115
-40 -25 -10 5 20 35 50 65 80 95
COMMON-MODE REJECTION
vs. TEMPERATURE
MAX4122/29-16
TEMPERATURE (°C)
COMMON-MODE REJECTION (dB)
VCM = 0V TO 5.0V
VCM = 0.2V TO 5.2V
VCM = 0.3V TO 5.3V
120
60 0 600
110
OUTPUT VOLTAGE: EITHER SUPPLY (mV)
GAIN (dB)
300
90
80
70
100 200 500
100
400
MAX4122/29-19
LARGE-SIGNAL GAIN
vs. OUTPUT VOLTAGE
VCC = 2.7V
RL TO VEE
RL = 500Ω
RL = 100kΩ
RL = 10kΩ
RL = 2kΩ
250
0-40 -25 -10 5 20 35 50 65 80 95
MINIMUM OUTPUT VOLTAGE
vs. TEMPERATURE
50
200
MAX4122/29-17
TEMPERATURE (°C)
VOUT - VEE (mV)
150
100
RL TO VCC
VCC = 6.5V, RL = 500Ω
VCC = 2.7V, RL = 100kΩ
VCC = 2.7V, RL = 500Ω
VCC = 6.5V, RL = 100kΩ
0
50
100
150
200
250
300
-40 -25 -10 5 20 35 50 65 80 95
MAXIMUM OUTPUT VOLTAGE
vs. TEMPERATURE
MAX4122/29-18
TEMPERATURE (°C)
VCC - VOUT (mV)
RL TO VEE
VCC = 6.5V, RL = 500Ω
VCC = 2.7V, RL = 100kΩ (BOTTOM)
VCC = 2.7V, RL = 500Ω
VCC = 6.5V, RL = 100kΩ (TOP)
120
60 0 600
110
OUTPUT VOLTAGE: EITHER SUPPLY (mV)
GAIN (dB)
300
90
80
70
100 200 500
100
400
MAX4122/29-20
LARGE-SIGNAL GAIN
vs. OUTPUT VOLTAGE
VCC = 6.5V
RL TO VEE
RL = 500Ω
RL = 100kΩ
RL = 10kΩ
RL = 2kΩ
125
75 -40 -25 -10 5 20 35 50 65 80 95
LARGE-SIGNAL GAIN
vs. TEMPERATURE
85
115
MAX4122/29-21
TEMPERATURE (°C)
GAIN (dB)
105
95
80
90
120
110
100
VCC = 2.7V,
RL TO VEE
VCC = 6.5V, RL TO VCC
VCC = 2.7V, RL TO VCC
RL = 500Ω
VOUT(p-p) = VCC - 1V VCC = 6.5V,
RL TO VEE
120
60 0 600
110
GAIN (dB)
300
90
80
70
100 200 500
100
400
MAX4122/29-22
LARGE-SIGNAL GAIN
vs. OUTPUT VOLTAGE
RL = 500Ω
RL = 100kΩ
RL = 10kΩ
RL = 2kΩ
VCC = 2.7V
RL TO VCC
OUTPUT VOLTAGE: EITHER SUPPLY (mV)
120
60 0 600
110
GAIN (dB)
300
90
80
70
100 200 500
100
400
MAX4122/29-23
LARGE-SIGNAL GAIN
vs. OUTPUT VOLTAGE
VCC = 6.5V
RL TO VCC
RL = 500Ω
RL = 100kΩ
RL = 10kΩ
RL = 2kΩ
OUTPUT VOLTAGE: EITHER SUPPLY (mV)
125
75 -40 -25 -10 5 20 35 50 65 80 95
LARGE-SIGNAL GAIN
vs. TEMPERATURE
85
115
MAX4122/29-24
TEMPERATURE (°C)
GAIN (dB)
105
95
80
90
120
110
100
VOUT(p-p) = VCC - 600mV
RL = 100kΩ
VCC = 6.5V, RL TO VEE
VCC = 2.7V, RL TO VCC
VCC = 2.7V, RL TO VEE
VCC = 6.5V, RL TO VCC
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0V, VCM = VCC/2, TA = +25°C, unless otherwise noted.)
MAX4122–MAX4129
Single/Dual/Quad, Wide-Bandwidth, Low-Power,
Single-Supply Rail-to-Rail I/O Op Amps
8 _______________________________________________________________________________________
IN
(5mV/div)
TIME (200ns/div)
OUT
(50mV/div)
AV = +10
MAX4124/25/28
SMALL-SIGNAL TRANSIENT
RESPONSE (NONINVERTING)
MAX4122/29-31
IN
(5mV/div)
TIME (200ns/div)
OUT
(50mV/div)
AV = -10
MAX4124/25/28
SMALL-SIGNAL TRANSIENT
RESPONSE (INVERTING)
MAX4122/29-32
IN
(2V/div)
TIME (2µs/div)
OUT
(2V/div)
AV = -1
MAX4122/23/26/27/29
LARGE-SIGNAL TRANSIENT
RESPONSE (INVERTING)
MAX4122/29-34
1.2
1.3
1.5
1.4
1.6
1.7
1.8
1.9
-40 -25 -10 5 20 35 50 65 80 95
MAX4123
MINIMUM OPERATING VOLTAGE
vs. TEMPERATURE
MAX4122/29-25
TEMPERATURE (°C)
MINIMUM OPERATING VOLTAGE (V)
IN
TIME (200ns/div)
VOLTAGE (50mV/div)
OUT
AV = +1
MAX4122/23/26/27/29
SMALL-SIGNAL TRANSIENT
RESPONSE (NONINVERTING)
MAX4122/29-28
10 100k10k
FREQUENCY (Hz)
100 1k
0.040
0
0.005
0.010
0.015
0.020
0.025
0.030
0.035
MAX4122/23/26/27/29 TOTAL HARMONIC
DISTORTION AND NOISE vs. FREQUENCY
MAX4122/29-26
THD & NOISE (%)
AV = +1
2Vp-p SIGNAL
500kHz LOWPASS FILTER
RL = 10kΩ TO VCC/2
0.1
0.001 4.0 4.44.2 5.04.84.6
MAX4123
TOTAL HARMONIC DISTORTION AND NOISE
vs. PEAK-TO-PEAK SIGNAL AMPLITUDE
MAX4122/29-27
PEAK-TO-PEAK SIGNAL AMPLITUDE (V)
THD + N (%)
0.01
AV = +1
10kHz SINEWAVE
RL TO VCC/2
500kHz LOWPASS FILTER
RL = 10kΩRL = 100kΩ
RL = 2kΩ
RL = 250Ω
IN
TIME (200ns/div)
VOLTAGE (50mV/div)
OUT
AV = -1
MAX4122/23/26/27/29
SMALL-SIGNAL TRANSIENT
RESPONSE (INVERTING)
MAX4122/29-29
IN
TIME (2µs/div)
VOLTAGE (2V/div)
OUT
AV = +1
MAX4122/23/26/27/29
LARGE-SIGNAL TRANSIENT
RESPONSE (NONINVERTING)
MAX4122/29-30
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0V, VCM = VCC/2, TA = +25°C, unless otherwise noted.)
MAX4122–MAX4129
Single/Dual/Quad, Wide-Bandwidth, Low-Power,
Single-Supply Rail-to-Rail I/O Op Amps
_______________________________________________________________________________________
9
IN
(200mV/div)
TIME (2µs/div)
OUT
(2V/div)
AV = +10
MAX4124/25/28
LARGE-SIGNAL TRANSIENT
RESPONSE (NONINVERTING)
MAX4122/29-33
IN
(200mV/div)
TIME (2µs/div)
OUT
(2V/div)
AV = -10
MAX4124/25/28
LARGE-SIGNAL TRANSIENT
RESPONSE (INVERTING)
MAX4122/29-35
Pin Description
Inverting Inputs for Amps 1 and 2IN1-, IN2-—
Noninverting Inputs for Amps 1 and 2IN1+, IN2+—
Shutdown Control for Amps 1 and 2. Tie
high or leave floating to enable amplifier.
SHDN1,
SHDN2
—
Outputs for Amps 3 and 4OUT3, OUT4—
Inverting Inputs for Amps 3 and 4IN3-, IN4-—
Positive SupplyVCC
5
No ConnectN.C.—
Shutdown Control. Tie high or leave floating
to enable amplifier.
SHDN
—
Outputs for Amps 1 and 2OUT1, OUT2—
Inverting InputIN-4
Noninverting Input IN+3
Negative Supply. Ground for single-supply
operation.
VEE
2
OutputOUT1
—
—
—
—
—
7
1, 5
8
—
2
3
4
6
2, 6
3, 5
—
—
—
8
—
—
1, 7
—
—
4
—
2, 12
3, 11
6, 9
—
—
14
5, 7, 8, 10
—
1, 13
—
—
4
—
2, 6
3, 5
—
8, 14
9, 13
4
—
—
1, 7
—
—
11
—
Noninverting Inputs for Amps 3 and 4IN3+, IN4+— — — — 10, 12
PIN
MAX4122
MAX4124
FUNCTIONNAME
MAX4123
MAX4125 MAX4126
MAX4128 MAX4127 MAX4129
MAX4122–MAX4129
Single/Dual/Quad, Wide-Bandwidth, Low-Power,
Single-Supply Rail-to-Rail I/O Op Amps
10 ______________________________________________________________________________________
1k
1k
Figure 2. Input Protection Circuit
R3
R3 = R1 R2
R1 R2
MAX4122–
MAX4129
Figure 1a. Reducing Offset Error Due to Bias Current
(Noninverting)
R3
R3 = R1 R2
R1 R2
MAX4122–
MAX4129
Figure 1b. Reducing Offset Error Due to Bias Current
(Inverting)
Applications Information
Rail-to-Rail Input Stage
Devices in the MAX4122–MAX4129 family of high-
speed amplifiers have rail-to-rail input and output
stages designed for low-voltage single-supply opera-
tion. 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 200µV. The switchover transi-
tion region, which occurs near VCC /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 common-
mode 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 cur-
rents 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 1kΩseries 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 500kΩ. For differential
input voltages greater than 1.8V the input resistance is
approximately 2kΩ, and the input bias current is
determined by the following equation:
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 (500Ωto 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 iso-
lating the load capacitor from the op amp’s output.
I = V - 1.8V
2k
BIAS DIFF Ω
MAX4122–MAX4129
Single/Dual/Quad, Wide-Bandwidth, Low-Power,
Single-Supply Rail-to-Rail I/O Op Amps
______________________________________________________________________________________ 11
IN
TIME (2µs/div)
VOLTAGE (1V/div)
OUT
VCC = 3V
AV = +1
Figure 3. Rail-to-Rail Input /Output Voltage Range
10,000
100 100 1k 100k10k
RESISTIVE LOAD (Ω)
CAPACITIVE LOAD (pF)
1000
UNSTABLE
REGION
RL TO VEE
VOUT = VCC/2
Figure 4. Capacitive-Load Stability
MAX4122–MAX4129
Single/Dual/Quad, Wide-Bandwidth, Low-Power,
Single-Supply Rail-to-Rail I/O Op Amps
12 ______________________________________________________________________________________
IN
TIME (400ns/div)
VOLTAGE (50mV/div)
OUT
AV = +1
CL = 500pF
Figure 5. MAX4122/23/26/27/29 Small-Signal Transient
Response with Capacitive Load
IN
TIME (400ns/div)
VOLTAGE (50mV/div)
OUT
AV = +1
CL = 1000pF
RS = 39Ω
Figure 7. MAX4122/23/26/27/29 Transient Response to
Capacitive Load with Isolation Resistor
IN
TIME (1µs/div)
VOLTAGE
OUT
AV = +10
CL = 500pF
(5mV/div)
(50mV/div)
Figure 6. MAX4124/25/28 Small-Signal Transient Response
with Capacitive Load
IN
TIME (1µs/div)
VOLTAGE
OUT
AV = +10
CL = 1000pF
RS = 56Ω
(5mV/div)
(50mV/div)
Figure 8. MAX4124/25/28 Transient Response to Capacitive
Load with Isolation Resistor
RS
CL
Figure 9. Capacitive-Load-Driving Circuit
SHDN
VOUT
0V TO 2.7V
STEP FOR
SHUTDOWN
TEST
0V TO 2.7V
STEP FOR
POWER-UP
TEST. 2.7V
FOR SHUTDOWN
ENABLE TEST.
SUPPLY-CURRENT
MONITORING POINT
VCC
10Ω2k 10k
2k
Figure 10. Power-Up/Shutdown Test Circuit
MAX4122–MAX4129
Single/Dual/Quad, Wide-Bandwidth, Low-Power,
Single-Supply Rail-to-Rail I/O Op Amps
______________________________________________________________________________________ 13
VCC
TIME (5µs/div)
VOLTAGE (1V/div)
OUT
Figure 11. Power-Up Output Voltage
SHDN
(1V/div)
TIME (2µs/div)
OUT
(0.5V/div)
VCC = 2.7V
RL = 10kΩ
Figure 13. Shutdown Output Voltage
VCC
(1V/div)
TIME (5µs/div)
ICC
(500µA/div)
Figure 12. Power-Up Supply Current
SHDN
(1V/div)
TIME (2µs/div)
ICC
(500µA/div)
VCC = 2.7V
Figure 14. Shutdown Enable/Disable Supply Current
Power-Up and Shutdown Mode
The MAX4122–MAX4129 amplifiers typically settle with-
in 1µs 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 shut-
down option. When the shutdown pin (SHDN) is pulled
low, the supply current drops below 25µA 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 indepen-
dently. Figures 13 and 14 show the output voltage and
supply current responses of the MAX4123 to a shut-
down 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 0.1µF ceramic capacitor in parallel
with at least 1µF. For dual supplies, bypass each sup-
ply 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.
MAX4122–MAX4129
Single/Dual/Quad, Wide-Bandwidth, Low-Power,
Single-Supply Rail-to-Rail I/O Op Amps
14 ______________________________________________________________________________________
Pin Configurations
VEE
IN-
IN+
15VCC
OUT
MAX4122
MAX4124
SOT23-5
TOP VIEW
2
34
14
13
12
11
10
9
8
1
2
3
4
5
6
7
VCC
OUT2
IN2-
IN2+
VEE
IN1+
IN1-
OUT1
MAX4127
N.C.
SHDN2
N.C.
N.C.
SHDN1
N.C.
SO
14
13
12
11
10
9
8
1
2
3
4
5
6
7
OUT4
IN4-
IN4+
VEE
VCC
IN1+
IN1-
OUT1
MAX4129
IN3+
IN3-
OUT3
OUT2
IN2-
IN2+
SO
IN2-
IN1+
IN2+
VEE
1
2
8
7
VCC
OUT2
IN1-
OUT1
MAX4126
MAX4128
SO/µMAX
3
4
6
5
OUT
IN1+
N.C.
VEE
1
2
8
7
SHDN
VCC
IN1-
N.C.
MAX4123
MAX4125
SO/µMAX
3
4
6
5
MAX4122–MAX4129
Single/Dual/Quad, Wide-Bandwidth, Low-Power,
Single-Supply Rail-to-Rail I/O Op Amps
______________________________________________________________________________________ 15
__________________________________________________________Chip Topographies
OUT2
IN2-
IN2+
0.066"
(1.676mm)
0.053"
(1.346mm)
VCC SHDN1SHDN2 VEE VCC
OUT1 VCC
IN1-
IN1+
VEE
SHDN
VCC
0.055"
(1.397mm)
0.036"
(0.914mm)
OUT
VEE IN-
iN+
VEE
TRANSISTOR COUNT: 170
SUBSTRATE CONNECTED TO VEE
TRANSISTOR COUNT: 340
SUBSTRATE CONNECTED TO VEE
MAX4123/
MAX4125 MAX4127/
MAX4128
PART
MAX4124EUK
MAX4125ESA -40°C to +85°C
-40°C to +85°C
TEMP. RANGE PIN-
PACKAGE
5 SOT23-5
8 SO
MARKING
INFO.
AABA
—
MAX4125EUA
MAX4126ESA
MAX4126EUA -40°C to +85°C
-40°C to +85°C
-40°C to +85°C 8 µMAX
8 SO
8 µMAX
—
—
—
MAX4127C/D
MAX4127ESD
MAX4128ESA -40°C to +85°C
-40°C to +85°C
0°C to +70°C Dice*
14 SO
8 SO
—
—
—
MAX4128EUA
MAX4129ESD -40°C to +85°C
-40°C to +85°C 8 µMAX
14 SO —
—
Ordering Information (continued)
*Dice are specified at TA= +25°C, DC parameters only.
MAX4122–MAX4129
Single/Dual/Quad, Wide-Bandwidth, Low-Power,
Single-Supply Rail-to-Rail I/O Op Amps
________________________________________________________Package Information
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
© 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
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Maxim Integrated:
MAX4126ESA+ MAX4127ESD+ MAX4128EUA+ MAX4122EUK+T MAX4122EUK-T MAX4123ESA
MAX4123ESA+ MAX4123ESA+T MAX4123EUA+ MAX4123EUA+T MAX4124EUK+T MAX4124EUK-T
MAX4125ESA MAX4125ESA+ MAX4125ESA+T MAX4125EUA MAX4126ESA MAX4126ESA+T MAX4126EUA
MAX4126EUA+ MAX4126EUA+T MAX4127ESD+T MAX4128ESA MAX4128ESA+ MAX4128ESA+T
MAX4128EUA+T MAX4125EUA-T MAX4123ESA-T MAX4125ESA-T MAX4126ESA-T MAX4126EUA-T
MAX4128ESA-T
