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
V
CC
to V
EE
, 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 1kΩ load, 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.
o
Beyond-the-Rails™ Inputs
o
No Phase Reversal for Overdriven Inputs
o
30µV Offset Voltage
o
Rail-to-Rail Output Swing with 1kΩ Load
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)
Features
o
Low-Voltage, Single-Supply Operation (2.7V to 6V)
MAX4091/MAX4092/MAX4094
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
________________________Applications
Portable Equipment
Battery-Powered Instruments
Data Acquisition and Control
Low-Voltage Signal Conditioning
Pin Configurations/Functional Diagrams
TOP VIEW
OUT1 1
N.C. 1
IN- 2
IN+ 3
V
EE
4
µMAX/SO
MAX4091
8
7
6
5
N.C.
V
CC
OUT
N.C.
OUT 1
V
EE
2
IN+ 3
SOT23
4
IN-
5
V
CC
OUT1 1
IN1- 2
IN1+ 3
V
EE
4
µMAX/SO
IN1- 2
MAX4092
8
7
6
5
V
CC
OUT2
IN2-
IN2+
IN2- 6
OUT2 7
9
8
IN3-
OUT3
IN1+ 3
V
CC
4
IN2+ 5
MAX4094
14 OUT4
13 IN4-
12 IN4+
11 V
EE
10 IN3+
MAX4091
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.
Single/Dual/Quad, Micropower, Single-Supply,
Rail-to-Rail Op Amps
MAX4091/MAX4092/MAX4094
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
CC
to V
EE
) ....................................................7V
Common-Mode Input Voltage..........(V
CC
+ 0.3V) to (V
EE
- 0.3V)
Differential Input Voltage .........................................±(V
CC
- V
EE
)
Input Current (IN+, IN-) ....................................................±10mA
Output Short-Circuit Duration
OUT shorted to GND or V
CC
.................................Continuous
Continuous Power Dissipation (T
A
= +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
(V
CC
= 2.7V to 6V, V
EE
= GND, V
CM
= 0, V
OUT
= V
CC
/2, T
A
= +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
Power-Supply Rejection
Ratio
V
CC
I
CC
V
OS
I
B
I
OS
V
CM
CMRR
PSRR
Inferred from PSRR test
V
CM
= V
CC
/2
V
CC
= 2.7V
V
CC
= 5V
2.7
115
130
0.03
20
0.2
V
EE
- 0.05
71
86
83
81
91
78
87
83
97
84
90
100
105
105
105
90
115
115
110
100
15
130
15
80
500
60
10
0.20
69
210
70
220
mV
mV
dB
6.0
165
185
1.4
180
7
V
CC
+ 0.05
V
µA
mV
nA
nA
V
dB
dB
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
CM
= V
EE
to V
CC
V
CM
= V
EE
to V
CC
V
CM
= V
EE
to V
CC
Inferred from CMRR test
(V
EE
- 0.05V)
≤
V
CM
≤
(V
CC
+ 0.05V)
2.7V
≤
V
CC
≤
6V
V
CC
= 2.7V, R
L
= 100kΩ Sourcing
0.25V
≤
V
OUT
≤
2.45V
Sinking
Large-Signal Voltage Gain
(Note 1)
A
VOL
V
CC
= 2.7V, R
L
= 1kΩ
0.5V
≤
V
OUT
≤
2.2V
Sourcing
Sinking
V
CC
= 5.0V, R
L
= 100kΩ Sourcing
0.25V
≤
V
OUT
≤
4.75V
Sinking
V
CC
= 5.0V, R
L
= 1kΩ
0.5V
≤
V
OUT
≤
4.5V
Sourcing
Sinking
R
L
= 100kΩ
R
L
= 1kΩ
R
L
= 100kΩ
R
L
= 1kΩ
Output Voltage Swing High
(Note 1)
Output Voltage Swing Low
(Note 1)
AC CHARACTERISTICS
Gain-Bandwidth Product
Phase Margin
Gain Margin
Slew Rate
V
OH
V
OL
|
V
CC
- V
OUT
|
|
V
OUT
- V
EE
|
R
L
= 100kΩ, C
L
= 100pF
R
L
= 100kΩ, C
L
= 100pF
R
L
= 100kΩ, C
L
= 100pF
R
L
= 100kΩ, C
L
= 15pF
GBWP
φ
M
SR
kHz
degrees
dB
V/µs
2
_______________________________________________________________________________________
Single/Dual/Quad, Micropower, Single-Supply,
Rail-to-Rail Op Amps
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 2.7V to 6V, V
EE
= GND, V
CM
= 0, V
OUT
= V
CC
/2, T
A
= +25°C.)
PARAMETER
Input-Noise Voltage Density
Input-Noise Current Density
Noise Voltage
(0.1Hz to 10Hz)
Total Harmonic Distortion
Plus Noise
Capacitive-Load Stability
Settling Time
Power-On Time
Op-Amp Isolation
THD + N
C
LOAD
t
S
t
ON
f = 1kHz, R
L
= 10kΩ, C
L
= 15pF,
A
V
= 1, V
OUT
= 2V
P-P
A
V
= 1
To 0.1%, 2V step
V
CC
= 0 to 3V step, V
IN
= V
CC
/2,
A
V
= 1
f = 1kHz (MAX4092/MAX4094)
SYMBOL
e
N
f = 10kHz
f = 10kHz
CONDITIONS
MIN
TYP
12
1.5
16
0.003
2000
12
2
125
MAX
UNITS
nV/√Hz
pA/√Hz
µV
RMS
%
pF
µs
µs
dB
MAX4091/MAX4092/MAX4094
ELECTRICAL CHARACTERISTICS
(V
CC
= 2.7V to 6V, V
EE
= GND, V
CM
= 0, V
OUT
= V
CC
/2, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values specified at
T
A
= +25°C.) (Note 2)
PARAMETER
DC CHARACTERISTICS
Supply Voltage Range
Supply Current
Input Offset Voltage
Input Offset Voltage Tempco
Input Bias Current
Input Offset Current
Input Common-Mode Range
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
V
CC
I
CC
V
OS
∆V
OS
/∆T
I
B
I
OS
V
CM
CMRR
PSRR
V
CM
= V
EE
to V
CC
V
CM
= V
EE
to V
CC
Inferred from CMRR test
(V
EE
- 0.05V)
≤
V
CM
≤
(V
CC
+ 0.05V)
2.7V
≤
V
CC
≤
6V
V
CC
= 2.7V, R
L
= 100kΩ
0.25V
≤
V
OUT
≤
2.45V
Large-Signal Voltage Gain
(Note 1)
V
CC
= 2.7V, R
L
= 1kΩ
0.5V
≤
V
OUT
≤
2.2V
V
CC
= 5V, R
L
= 100kΩ
0.25V
≤
V
OUT
≤
4.75V
V
CC
= 5V, R
L
= 1kΩ
0.5V
≤
V
OUT
≤
4.5V
Output Voltage Swing High
(Note 1)
Output Voltage Swing Low
(Note 1)
V
OH
V
OL
Sourcing
Sinking
Sourcing
Sinking
Sourcing
Sinking
Sourcing
Sinking
R
L
= 100kΩ
R
L
= 1kΩ
R
L
= 100kΩ
R
L
= 1kΩ
V
EE
- 0.05
62
80
82
80
90
76
86
82
94
80
75
250
75
250
mV
mV
dB
Inferred from PSRR test
V
CM
= V
CC
/2
V
CM
= V
EE
to V
CC
±2
±200
±20
V
CC
+ 0.05
V
CC
= 2.7V
V
CC
= 5V
2.7
6.0
200
225
±3.5
V
µA
mV
µV/°C
nA
nA
V
dB
dB
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
A
VOL
V
CC
- V
OUT
V
OUT
- V
EE
Note 1:
R
L
is connected to V
EE
for A
VOL
sourcing and V
OH
tests. R
L
is connected to V
CC
for A
VOL
sinking and V
OL
tests.
Note 2:
All specifications are 100% tested at T
A
= +25°C. Specification limits over temperature (T
A
= T
MIN
to T
MAX
) are guaranteed
by design, not production tested.
_______________________________________________________________________________________
3
Single/Dual/Quad, Micropower, Single-Supply,
Rail-to-Rail Op Amps
MAX4091/MAX4092/MAX4094
Typical Operating Characteristics
(V
CC
= 5V, V
EE
= 0, T
A
= +25°C, unless otherwise noted.)
GAIN AND PHASE
vs. FREQUENCY
MAX4091 toc01
GAIN AND PHASE
vs. FREQUENCY
80
60
GAIN
40
GAIN (dB)
20
0
-20
-40
0.01
PHASE
60
0
-60
180
120
PHASE (DEGREES)
80
60
A
V
= 1000
NO LOAD
MAX4091 toc02
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
120
PHASE (DEGREES)
100
PSRR (dB)
80
60
40
20
V
EE
V
CC
V
IN
= 2.5V
MAX4091 toc03
180
120
60
0
GAIN
40
GAIN (dB)
20
0
-20
-40
0.01
C
L
= 470pF
A
V
= 1000
R
L
=
∞
140
PHASE
-60
-120
-120
-180
1000 10,000
0
0.1
1
10
100
-180
1000 10,000
-20
0.01
0.1
1
10
100
0.1
1
10
100
1000
FREQUENCY (kHz)
FREQUENCY (kHz)
FREQUENCY (kHz)
CHANNEL ISOLATION
vs. FREQUENCY
MAX4901 toc04
OFFSET VOLTAGE
vs. TEMPERATURE
MAX4091 toc05
OFFSET VOLTAGE vs.
COMMON-MODE VOLTAGE
V
CM
= 0
80
60
OFFSET VOLTAGE (µV)
40
20
0
-20
-40
-60
V
CC
= 6V
V
CC
= 2.7V
MAX4091 toc06
140
V
IN
= 2.5V
CHANNEL SEPARATION (dB)
120
100
80
60
40
20
0
0.01
160
140
OFFSET VOLTAGE (
m
V)
120
100
80
60
40
20
0
100
-80
-100
0.1
1
10
100
1000 10,000
-60 -40 -20 0
20 40 60 80 100 120 140
-1
0
1
2
3
4
5
6
7
FREQUENCY (kHz)
TEMPERATURE (
°
C)
COMMON-MODE VOLTAGE (V)
COMMON-MODE REJECTION RATIO
vs. TEMPERATURE
MAX4091 toc07
INPUT BIAS CURRENT vs.
COMMON-MODE VOLTAGE
20
INPUT BIAS CURRENT (nA)
15
10
5
0
-5
-10
-15
-20
-25
0
1
2
3
4
5
6
V
CC
= 6V
V
CC
= 2.7V
MAX4091 toc08
INPUT BIAS CURRENT vs.
TEMPERATURE
30
INPUT BIAS CURRENT (nA)
20
10
0
-10
-20
-30
-40
-50
-25
0
25
50
75
100
125
V
CM
= 0
V
CC
= 6V
V
CC
= 2.7V
V
CC
= 6V
MAX4091 toc09
110
100
90
CMRR (dB)
80
70
60
50
-60 -40 -20 0
V
CM
= -0.2V TO +5.2V
V
CM
= -0.3V TO +5.3V
V
CM
= -0.4V TO +5.4V
V
CM
= 0 TO 5V
V
CM
= -0.1V TO +5.1V
25
40
V
CM
= V
CC
20 40 60 80 100 120 140
TEMPERATURE (
°
C)
COMMON-MODE VOLTAGE (V)
TEMPERATURE (°C)
4
_______________________________________________________________________________________
Single/Dual/Quad, Micropower, Single-Supply,
Rail-to-Rail Op Amps
Typical Operating Characteristics (continued)
(V
CC
= 5V, V
EE
= 0, T
A
= +25°C, unless otherwise noted.)
MAX4091/MAX4092/MAX4094
SUPPLY CURRENT PER AMPLIFIER
vs. TEMPERATURE
MAX4091 toc10
SUPPLY CURRENT PER AMPLIFIER
vs. SUPPLY VOLTAGE
180
160
140
120
100
80
60
40
MAX4091 toc11
LARGE-SIGNAL GAIN
vs. OUTPUT VOLTAGE
110
100
GAIN (dB)
90
80
70
60
50
V
CC
= 6V
R
L
TO V
EE
0
100
400
200 300
V
CC
- V
OUT
(mV)
500
600
R
L
= 1M
9
R
L
= 1k
9
R
L
= 100k
9
MAX4091 toc12
220
200
SUPPLY CURRENT PER AMP (µA)
180
160
140
120
100
80
60
40
20
0
-50
-25
0
25
50
75
100
V
CC
= 2.7V
V
CC
= 5V
V
OUT
= V
CM
= V
CC
/2
200
SUPPLY CURRENT PER AMP (µA)
120
R
L
= 10k
9
125
1
2
3
4
5
6
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
LARGE-SIGNAL GAIN
vs. OUTPUT VOLTAGE
MAX4091 toc13
LARGE-SIGNAL GAIN
vs. TEMPERATURE
115
LARGE-SIGNAL GAIN (dB)
110
105
100
95
90
85
80
R
L
TO V
EE
V
CC
= 2.7V
V
CC
= 6V
R
L
= 1k
W
, 0.5V < V
OUT
< (V
CC
- 0.5V)
R
L
TO V
CC
MAX4091 toc14
LARGE-SIGNAL GAIN
vs. OUTPUT VOLTAGE
110
100
GAIN (dB)
90
80
70
60
50
V
CC
= 6V
R
L
TO V
CC
0
100
200
300
400
500
600
R
L
= 1M
9
R
L
= 100k
9
MAX4091 toc15
120
110
100
GAIN (dB)
90
80
70
60
50
0
100
R
L
= 1M
9
120
120
R
L
= 100k
9
R
L
= 10k
9
R
L
= 1k
9
R
L
= 1k
9
R
L
= 10k
9
V
CC
= 2.7V
R
L
TO V
EE
400
200 300
V
CC
- V
OUT
(mV)
500
600
-60 -40 -20 0
20 40 60 80 100 120 140
TEMPERATURE (
°
C)
V
OUT
(mV)
LARGE-SIGNAL GAIN
vs. OUTPUT VOLTAGE
MAX4091 toc16
LARGE-SIGNAL GAIN
vs. TEMPERATURE
115
LARGE-SIGNAL GAIN (dB)
110
105
100
95
90
V
CC
= 2.7V
85
80
R
L
TO V
EE
R
L
= 100k
W
, 0.3V < V
OUT
< (V
CC
- 0.3V)
R
L
TO V
CC
V
CC
= 6V
MAX4091 toc17
MINIMUM OUTPUT VOLTAGE
vs. TEMPERATURE
200
180
MINIMUM V
OUT
(nV)
160
140
120
100
80
60
40
20
0
V
CC
= 6V, R
L
= 100k
W
V
CC
= 2.7V, R
L
= 100k
W
-60 -40 -20
0 20 40 60 80 100 120 140
TEMPERATURE (
°
C)
V
CC
= 2.7V, R
L
= 1k
W
R
L
TO V
CC
V
CC
= 6V, R
L
= 1k
W
MAX4091 toc18
120
110
100
GAIN (dB)
90
80
70
60
50
0
100
200
300 400
V
OUT
(mV)
500
R
L
= 1k
9
R
L
= 10k
9
V
CC
= 2.7V
R
L
TO V
CC
R
L
= 100k
9
R
L
= 1M
9
120
220
600
-60 -40 -20 0
20 40 60 80 100 120 140
TEMPERATURE (
°
C)
_______________________________________________________________________________________
5
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