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19-2272; Rev 0; 1/02
Single/Dual/Quad, Micropower, Single-Supply,
Rail-to-Rail Op Amps
General Description
The single MAX4091, dual MAX4092, and quad
MAX4094 operational amplifiers combine excellent DC
accuracy with Rail-to-Rail® operation at the input and
output. Since the common-mode voltage extends from
VCC to VEE, the devices can operate from either a sin-
gle supply (2.7V to 6V) or split supplies (±1.35V to
±3V). Each op amp requires less than 130µA of supply
current. Even with this low current, the op amps are
capable of driving a 1kload, and the input-referred
voltage noise is only 12nV/Hz. In addition, these op
amps can drive loads in excess of 2000pF.
The precision performance of the MAX4091/MAX4092/
MAX4094 combined with their wide input and output
dynamic range, low-voltage, single-supply operation,
and very low supply current, make them an ideal
choice for battery-operated equipment, industrial, and
data acquisition and control applications. In addition,
the MAX4091 is available in space-saving 5-pin SOT23,
8-pin µMAX, and 8-pin SO packages. The MAX4092 is
available in 8-pin µMAX and SO packages, and the
MAX4094 is available in 14-pin TSSOP and 14-pin SO
packages.
________________________Applications
Portable Equipment
Battery-Powered Instruments
Data Acquisition and Control
Low-Voltage Signal Conditioning
Features
o Low-Voltage, Single-Supply Operation (2.7V to 6V)
o Beyond-the-Rails™ Inputs
o No Phase Reversal for Overdriven Inputs
o 30µV Offset Voltage
o Rail-to-Rail Output Swing with 1kLoad
o Unity-Gain Stable with 2000pF Load
o 165µA (max) Quiescent Current Per Op Amp
o 500kHz Gain-Bandwidth Product
o High Voltage Gain (115dB)
o High Common-Mode Rejection Ratio (90dB) and
Power-Supply Rejection Ratio (100dB)
o Temperature Range (-40°C to +125°C)
Ordering Information
PART
MAX4091AUK-T
MAX4091ASA
MAX4091AUA
MAX4092ASA
MAX4092AUA
MAX4094AUD
MAX4094ASD
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
5 SOT23-5
8 SO
8 µMAX
8 SO
8 µMAX
14 TSSOP
14 SO
Pin Configurations/Functional Diagrams
TOP VIEW
N.C. 1
IN- 2
IN+ 3
VEE 4
MAX4091
µMAX/SO
8 N.C.
7 VCC
6 OUT
5 N.C.
OUT 1
VEE 2
IN+ 3
MAX4091
SOT23
5 VCC OUT1 1
IN1- 2
IN1+ 3
4 IN-
VEE 4
MAX4092
µMAX/SO
OUT1 1
IN1- 2
8 VCC IN1+ 3
7 OUT2 VCC 4
6 IN2-
IN2+ 5
5 IN2+
IN2- 6
OUT2 7
MAX4094
14 OUT4
13 IN4-
12 IN4+
11 VEE
10 IN3+
9 IN3-
8 OUT3
TSSOP/SO
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
Beyond-the-Rails is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ 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.

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Single/Dual/Quad, Micropower, Single-Supply,
Rail-to-Rail Op Amps
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC to VEE) ....................................................7V
Common-Mode Input Voltage..........(VCC + 0.3V) to (VEE - 0.3V)
Differential Input Voltage .........................................±(VCC - VEE)
Input Current (IN+, IN-) ....................................................±10mA
Output Short-Circuit Duration
OUT shorted to GND or VCC .................................Continuous
Continuous Power Dissipation (TA = +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C)...........571mW
8-Pin SO (derate 5.88mW/°C above +70°C)...............471mW
8-Pin µMAX (derate 4.1mW/°C above +70°C) ............330mW
14-Pin SO (derate 8.33mW/°C above +70°C).............667mW
14-Pin TSSOP (derate 9.1mW/°C above +70°C) ........727mW
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
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
(VCC = 2.7V to 6V, VEE = GND, VCM = 0, VOUT = VCC/2, TA = +25°C.)
PARAMETER
DC CHARACTERISTICS
Supply Voltage Range
Supply Current
Input Offset Voltage
Input Bias Current
Input Offset Current
Input Common-Mode Range
Common-Mode Rejection
Ratio
SYMBOL
CONDITIONS
VCC
ICC
VOS
IB
IOS
VCM
CMRR
Inferred from PSRR test
VCM = VCC/2
VCC = 2.7V
VCC = 5V
VCM = VEE to VCC
VCM = VEE to VCC
VCM = VEE to VCC
Inferred from CMRR test
(VEE - 0.05V) VCM (VCC + 0.05V)
MIN
TYP
MAX
UNITS
2.7
VEE - 0.05
71
6.0
115 165
130 185
0.03 1.4
20 180
0.2 7
VCC + 0.05
90
V
µA
mV
nA
nA
V
dB
Power-Supply Rejection
Ratio
Large-Signal Voltage Gain
(Note 1)
Output Voltage Swing High
(Note 1)
Output Voltage Swing Low
(Note 1)
AC CHARACTERISTICS
Gain-Bandwidth Product
Phase Margin
Gain Margin
Slew Rate
PSRR
AVOL
VOH
VOL
2.7V VCC 6V
VCC = 2.7V, RL = 100kSourcing
0.25V VOUT 2.45V Sinking
VCC = 2.7V, RL = 1k
0.5V VOUT 2.2V
Sourcing
Sinking
VCC = 5.0V, RL = 100kSourcing
0.25V VOUT 4.75V Sinking
VCC = 5.0V, RL = 1k
0.5V VOUT 4.5V
Sourcing
Sinking
|VCC - VOUT|
RL = 100k
RL = 1k
|VOUT - VEE|
RL = 100k
RL = 1k
GBWP
φM
SR
RL = 100k, CL = 100pF
RL = 100k, CL = 100pF
RL = 100k, CL = 100pF
RL = 100k, CL = 15pF
86
83
81
91
78
87
83
97
84
100 dB
105
105
105
90
dB
115
115
110
100
15 69
mV
130 210
15 70
mV
80 220
500
60
10
0.20
kHz
degrees
dB
V/µs
2 _______________________________________________________________________________________

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Single/Dual/Quad, Micropower, Single-Supply,
Rail-to-Rail Op Amps
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 2.7V to 6V, VEE = GND, VCM = 0, VOUT = VCC/2, TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
Input-Noise Voltage Density eN f = 10kHz
Input-Noise Current Density
f = 10kHz
Noise Voltage
(0.1Hz to 10Hz)
Total Harmonic Distortion
Plus Noise
Capacitive-Load Stability
Settling Time
Power-On Time
Op-Amp Isolation
THD + N
CLOAD
tS
tON
f = 1kHz, RL = 10k, CL = 15pF,
AV = 1, VOUT = 2VP-P
AV = 1
To 0.1%, 2V step
VCC = 0 to 3V step, VIN = VCC/2,
AV = 1
f = 1kHz (MAX4092/MAX4094)
MIN
TYP
MAX
UNITS
12 nV/√Hz
1.5 pA/√Hz
16 µVRMS
0.003
2000
12
2
125
%
pF
µs
µs
dB
ELECTRICAL CHARACTERISTICS
(VCC = 2.7V to 6V, VEE = GND, VCM = 0, VOUT = VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values specified at
TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
DC CHARACTERISTICS
Supply Voltage Range
VCC Inferred from PSRR test
2.7 6.0 V
Supply Current
ICC VCM = VCC/2
VCC = 2.7V
VCC = 5V
200
µA
225
Input Offset Voltage
VOS
VCM = VEE to VCC
±3.5 mV
Input Offset Voltage Tempco
VOS/T
±2 µV/°C
Input Bias Current
IB VCM = VEE to VCC
±200 nA
Input Offset Current
IOS VCM = VEE to VCC
±20 nA
Input Common-Mode Range
VCM Inferred from CMRR test
VEE - 0.05
VCC + 0.05 V
Common-Mode Rejection Ratio
CMRR (VEE - 0.05V) VCM (VCC + 0.05V)
62
dB
Power-Supply Rejection Ratio
PSRR 2.7V VCC 6V
80 dB
VCC = 2.7V, RL = 100k
0.25V VOUT 2.45V
Sourcing
Sinking
82
80
Large-Signal Voltage Gain
(Note 1)
AVOL
VCC = 2.7V, RL = 1k
0.5V VOUT 2.2V
VCC = 5V, RL = 100k
0.25V VOUT 4.75V
Sourcing
Sinking
Sourcing
Sinking
90
76
86
82
dB
VCC = 5V, RL = 1k
0.5V VOUT 4.5V
Sourcing
Sinking
94
80
Output Voltage Swing High
(Note 1)
VOH VCC - VOUT
RL = 100k
RL = 1k
75
mV
250
Output Voltage Swing Low
(Note 1)
VOL VOUT - VEE
RL = 100k
RL = 1k
75
mV
250
Note 1: RL is connected to VEE for AVOL sourcing and VOH tests. RL is connected to VCC for AVOL sinking and VOL tests.
Note 2: All specifications are 100% tested at TA = +25°C. Specification limits over temperature (TA = TMIN to TMAX) are guaranteed
by design, not production tested.
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Single/Dual/Quad, Micropower, Single-Supply,
Rail-to-Rail Op Amps
(VCC = 5V, VEE = 0, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
GAIN AND PHASE
vs. FREQUENCY
80 180MAX4091 toc01
AV = 1000
NO LOAD
60 120
GAIN
40 60
20 PHASE
0
0
-60
-20 -120
-40
0.01 0.1
1 10 100
FREQUENCY (kHz)
-180
1000 10,000
CHANNEL ISOLATION
vs. FREQUENCY
140
VIN = 2.5V
120
100
80
60
40
20
0
0.01 0.1
1 10 100 1000 10,000
FREQUENCY (kHz)
COMMON-MODE REJECTION RATIO
vs. TEMPERATURE
110
VCM = 0 TO 5V
100 VCM = -0.1V TO +5.1V
90
80
70 VCM = -0.2V TO +5.2V
VCM = -0.3V TO +5.3V
60 VCM = -0.4V TO +5.4V
50
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
GAIN AND PHASE
vs. FREQUENCY
80 180MAX4091 toc02
CL = 470pF
60
GAIN
AV = 1000
RL =
120
40 60
20
PHASE
0
0
-60
-20 -120
-40
0.01 0.1
1 10 100
FREQUENCY (kHz)
-180
1000 10,000
OFFSET VOLTAGE
vs. TEMPERATURE
160
VCM = 0
140
120
100
80
60
40
20
0
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
25
20
15
10
5
0
-5
-10
-15
-20
-25
0
INPUT BIAS CURRENT vs.
COMMON-MODE VOLTAGE
VCC = 6V
VCC = 2.7V
12345
COMMON-MODE VOLTAGE (V)
6
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
140
120 VIN = 2.5V
VCC
100
80
60
40
20
0
-20
0.01
VEE
0.1 1
10 100
FREQUENCY (kHz)
1000
OFFSET VOLTAGE vs.
COMMON-MODE VOLTAGE
100
80
60
40
VCC = 2.7V
20
0
-20
-40 VCC = 6V
-60
-80
-100
-1
0123456
COMMON-MODE VOLTAGE (V)
7
INPUT BIAS CURRENT vs.
TEMPERATURE
40
30 VCM = VCC
20
VCC = 6V
10
VCC = 2.7V
0
-10
-20
VCM = 0
-30
VCC = 6V
-40
-50 -25
0 25 50 75
TEMPERATURE (°C)
100 125
4 _______________________________________________________________________________________

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Single/Dual/Quad, Micropower, Single-Supply,
Rail-to-Rail Op Amps
Typical Operating Characteristics (continued)
(VCC = 5V, VEE = 0, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT PER AMPLIFIER
vs. TEMPERATURE
220
200 VOUT = VCM = VCC/2
180
160 VCC = 5V
140
120 VCC = 2.7V
100
80
60
40
20
0
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
LARGE-SIGNAL GAIN
vs. OUTPUT VOLTAGE
120
RL = 1M9
110
100
90 RL = 100k9
RL = 10k9
80 RL = 1k9
70
60
50
0
VCC = 2.7V
RL TO VEE
100 200 300 400 500 600
VCC - VOUT (mV)
LARGE-SIGNAL GAIN
vs. OUTPUT VOLTAGE
120
110
RL = 100k9
RL = 1M9
100
90
80 RL = 1k9
70 RL = 10k9
60
50
0
VCC = 2.7V
RL TO VCC
100 200 300 400 500 600
VOUT (mV)
SUPPLY CURRENT PER AMPLIFIER
vs. SUPPLY VOLTAGE
200
180
160
140
120
100
80
60
40
1
2345
SUPPLY VOLTAGE (V)
6
LARGE-SIGNAL GAIN
vs. TEMPERATURE
120
W115 RL = 1k , 0.5V < VOUT < (VCC - 0.5V)
110 RL TO VCC
105
100
95 VCC = 2.7V
VCC = 6V
90 RL TO VEE
85
80
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
LARGE-SIGNAL GAIN
vs. TEMPERATURE
120
WRL = 100k , 0.3V < VOUT < (VCC - 0.3V)
115
RL TO VCC
110 VCC = 6V
105
100
95
RL TO VEE
90
VCC = 2.7V
85
80
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
LARGE-SIGNAL GAIN
vs. OUTPUT VOLTAGE
120
RL = 10k9
110
100 RL = 1M9
90 RL = 100k9
80 RL = 1k9
70
60
50
0
VCC = 6V
RL TO VEE
100 200 300 400 500 600
VCC - VOUT (mV)
LARGE-SIGNAL GAIN
vs. OUTPUT VOLTAGE
120
RL = 1M9
110
100 RL = 100k9
90
RL = 1k9
80 RL = 10k9
70
60
50
0
VCC = 6V
RL TO VCC
100 200 300 400 500 600
VOUT (mV)
MINIMUM OUTPUT VOLTAGE
vs. TEMPERATURE
220
200 RL TO VCC
W180 VCC = 6V, RL = 1k
160
140
W120 VCC = 2.7V, RL = 1k
100
80
W60 VCC = 6V, RL = 100k
40
W20 VCC = 2.7V, RL = 100k
0
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
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