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19-2110; Rev 0; 8/01
SOT23, Very High Precision, 3V/5V
Rail-to-Rail Op Amps
General Description
The MAX4236/MAX4237 are high-precision op amps
that feature an exceptionally low offset voltage and off-
set voltage temperature coefficient without using any
chopper techniques. The MAX4236 and MAX4237 have
a typical large-signal, open-loop voltage gain of 120dB.
These devices have an ultra-low input-bias current of
1pA. The MAX4236 is unity-gain stable with a gain-
bandwidth product of 1.7MHz, while the MAX4237 is
stable for closed-loop gains greater than 5V/V with a
gain-bandwidth product of 7.5MHz. Both devices have
a shutdown function in which the quiescent current is
reduced to less than 0.1µA, and the amplifier output is
forced into a high-impedance state.
The input common-mode range of the MAX4236/
MAX4237 extends below the negative supply range, and
the output swings Rail-to-Rail®. These features make the
amplifiers ideal for applications with +3V or +5V single
power supplies. The MAX4236/MAX4237 are specified for
the extended temperature range (-40°C to +85°C) and
are available in tiny SOT23, µMAX, and SO packages. For
greater accuracy, the A grade µMAX and SO packages
are tested to guarantee 20µV (max) offset voltage at
+25°C and less then 2µV/°C drift.
Applications
Strain Gauges
Piezoelectric Sensors
Thermocouple Amplifiers
Electrochemical Sensors
Battery-Powered Instrumentation
Instrumentation Amplifiers
Rail-to-Rail is a registered trademark of Nippon Motorola, Inc.
Pin Configurations
TOP VIEW
OUT 1
VEE 2
IN+ 3
MAX4236
MAX4237
6 VCC
N.C. 1
IN- 2
5 SHDN
IN+ 3
VEE 4
MAX4236A/B
MAX4237A/B
8 SHDN
7 VCC
6 OUT
5 N.C.
4 IN-
SO-8/µMAX
SOT23-6
Features
o Ultra-Low Offset Voltage
20µV (max) at +25°C (Grade A)
50µV (max) at +25°C (Grade B, 6-Pin SOT23)
o Ultra-Low Offset Voltage Drift
2µV/°C (max) (Grade A)
4.5µV/°C (max) (Grade B, 6-Pin SOT23)
5.5µV/°C (max) (6-Pin SOT23)
o Ultra-Low 1pA Input Bias Current
o High Open-Loop Voltage Gain: 110dB (min)
(RL = 100k)
o Compatible with +3V and +5V Single-Supply
Power Systems
o Ground Sensing: Input Common-Mode Range
Includes Negative Rail
o Rail-to-Rail Output Swing into a 1kLoad
o 350µA Quiescent Current
o Gain-Bandwidth Product
1.7MHz (MAX4236, AV = 1V/V)
7.5MHz (MAX4237, AV = 5V/V)
o 200pF Capacitive Load Handling Capability
o Shutdown Mode: 0.1µA Quiescent Current,
Places Output in a High-Impedance State
o Available in Space-Saving SOT23 and µMAX
Packages
PART
MAX4236EUT-T
MAX4236AEUA
MAX4236BEUA
MAX4236AESA
MAX4236BESA
MAX4237EUT-T
MAX4237AEUA
MAX4237BEUA
MAX4237AESA
MAX4237BESA
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
6 SOT23-6
8 µMAX
8 µMAX
8 SO
8 SO
6 SOT23-6
8 µMAX
8 µMAX
8 SO
8 SO
________________________________________________________________ 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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SOT23, Very High Precision, 3V/5V
Rail-To-Rail Op Amps
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC - VEE) ......................................-0.3V to +6V
Analog Input Voltage (IN+ or IN-) ....(VEE - 0.3V) to (VCC + 0.3V)
Logic Input Voltage (SHDN) ............(VEE - 0.3V) to (VCC + 0.3V)
Current into Any Pin ............................................................20mA
Output Short-Circuit Duration....Continuous to Either VCC or VEE
Continuous Power Dissipation (TA = +70°C)
6-Pin SOT23-6 (derate 8.7mW/°C above +70°C) .........696mW
8-Pin µMAX (derate 4.5mW/°C above +70°C) ..............362mW
8-Pin SO (derate 5.9mW/°C above +70°C)...................471mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +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 (SO-8 and µMAX-8)
(VCC = +2.4V to +5.5V, VEE = 0, VCM = 0, VOUT = VCC/2, RL = 100kto VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical
values are at VCC = +5V and TA = +25°C.) (Note 1)
PARAMETER
Supply Voltage Range
Quiescent Supply Current
Input Offset Voltage
Input Offset Voltage Temperature
Coefficient
Input Bias Current
Input Offset Current
Input Resistance
SYMBOL
VCC
ICC
VOS
TCVOS
IB
IOS
RIN
CONDITIONS
Guaranteed by the PSRR test
VCC = +5V
In normal mode
In shutdown mode
VCC = +3V
In normal mode
In shutdown mode
VCC = +5V,
Grade A
VCC = +5V,
Grade B
TA = +25oC
TA = TMIN to TMAX
TA = +25oC
TA = TMIN to TMAX
VCC = +5V
(Note 3)
Grade A
Grade B
(Note 2)
(Note 2)
Differential or common mode
MIN
2.4
TYP
350
0.1
350
0.1
±5
±5
±0.6
±0.6
±1
±1
1000
MAX
5.5
440
2
440
2
±20
±150
±50
±340
±2
±4.5
±500
UNITS
V
µA
µV
µV/°C
pA
pA
M
Input Common-Mode Voltage
VCM Guaranteed by the CMRR test
-0.15
VCC - 1.2 V
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
CMRR
PSRR
VCC = +5V;
-0.15V VCM
(VCC - 1.2V)
VCC = +3.0V;
-0.15V VCM
(VCC - 1.2V)
VCC = +2.4V to
+5.5V
TA = +25oC
TA = TMIN to TMAX
TA = +25oC
TA = TMIN to TMAX
TA = +25oC
TA = TMIN to TMAX
84 102
80
82 102
78
97 120
95
dB
dB
2 _______________________________________________________________________________________

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SOT23, Very High Precision, 3V/5V
Rail-To-Rail Op Amps
ELECTRICAL CHARACTERISTICS (SO-8 and µMAX-8) (continued)
(VCC = +2.4V to +5.5V, VEE = 0, VCM = 0, VOUT = VCC/2, RL = 100kto VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical
values are at VCC = +5V and TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
VCC = +5V, RL
connected to
VCC/2,
TA = +25oC
RL = 100k, VOUT =
15mV to (VCC - 50mV)
RL = 1k, VOUT =
0.15V to (VCC - 0.3V)
110 128
105 114
Large-Signal Voltage Gain
AVOL
VCC = +5V, RL
connected to
VCC/2,
TA = TMIN to
TMAX
VCC = +3V, RL
connected to
VCC/2,
TA = +25oC
VCC = +3V, RL
connected to
VCC/2,
TA = TMIN to
TMAX
RL = 100k, VOUT =
15mV to (VCC - 50mV)
RL = 1k,
VOUT = 0.15V
to (VCC - 0.3V)
RL = 100k, VOUT =
15mV to (VCC - 50mV)
RL = 1k,
VOUT = 0.15V
to (VCC - 0.3V)
RL = 100k, VOUT =
15mV to (VCC - 50mV)
RL = 1k,
VOUT = 0.15V
to (VCC - 0.3V)
110
100
110 128
100 114
105
95
dB
Output Voltage Swing
Output Short-Circuit Current
Gain-Bandwidth Product
Slew Rate
Settling Time
Total Harmonic Distortion
VOUT
VCC = +5V,
RL connected to VCC /2,
RL = 100k
VCC = +5V,
RL connected to VCC/2,
RL = 1k
VCC - VOH
VOL - VEE
VCC - VOH
VOL - VEE
IOUT(SC)
GBWP
SR
tS
THD
Shorted to VEE
Shorted to VCC
RL = , CL = 5pF
MAX4236
MAX4237
MAX4236
VCC = +5V, VOUT = 4V step MAX4237
VOUT settling to within
0.01%
MAX4236
MAX4237
f = 5kHz, VOUT = 2Vp-p, VCC = +5V
RL = 10k
2 10
3 10
mV
150 250
50 100
10
mA
30
1.7
MHz
7.5
0.3
V/µs
1.3
1
µs
1
0.001
%
_______________________________________________________________________________________ 3

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SOT23, Very High Precision, 3V/5V
Rail-To-Rail Op Amps
ELECTRICAL CHARACTERISTICS (SO-8 and µMAX-8) (continued)
(VCC = +2.4V to +5.5V, VEE = 0, VCM = 0, VOUT = VCC/2, RL = 100kto VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical
values are at VCC = +5V and TA = +25°C.) (Note 1)
PARAMETER
Input Capacitance
Input Voltage Noise Density
Input Noise Voltage
Capacitive Load Stability
Shutdown Mode Output
Leakage
SHDN Logic Low
SHDN Logic High
SHDN Input Current
Shutdown Delay Time
Shutdown Recovery Time
SYMBOL
CIN
en
enp-p
CLOAD
IOUT(SH)
CONDITIONS
f = 100kHz
f = 1kHz
f = 0.1Hz to 10Hz
No sustained oscillations
MAX4236
MAX4237
Device in shutdown mode (SHDN = VEE)
VOUT = 0 to VCC
VIL
VIH
t(SH)
t(EN)
SHDN = VEE or VCC
RL = 1k
RL = 1k
MIN TYP MAX UNITS
7.5 pF
14 nV/Hz
0.2 µVp-p
200
pF
200
±0.01 ±1.0 µA
0.3
VCC
V
0.7
VCC
V
1 3 µA
1 µs
4 µs
ELECTRICAL CHARACTERISTICS (SOT23-6)
(VCC = +2.4V to +5.5V, VEE = 0, VCM = 0, VOUT = VCC/2, RL = 100kto VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical
values are at VCC = +5V and TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Supply Voltage Range
Quiescent Supply Current
Input Offset Voltage
VCC Guaranteed by the PSRR test
VCC = +5V
ICC
VCC = +3V
VOS VCC = +5V
In normal mode
In shutdown mode
In normal mode
In shutdown mode
TA = +25°C
TA = TMIN to TMAX
2.4 5.5 V
350 440
0.1 2
µA
350 440
0.1 2
±5 ±50
µV
±600
Input Offset Voltage Temperature
Coefficient (Note 2)
TCVOS VCC = +5V
±0.6 ±5.5 µV/°C
Input Bias Current
Input Offset Current
Input Resistance
Input Common-Mode Voltage
Common-Mode Rejection Ratio
IB
IOS
RIN
VCM
CMRR
(Note 2)
(Note 2)
Differential or common mode
Guaranteed by the CMRR test
VCC = +5V, -0.15V TA = +25°C
VCM (VCC - 1.2V) TA = TMIN to TMAX
VCC = +3.0V; -0.15V TA = +25°C
VCM (VCC - 1.2V) TA = TMIN to TMAX
-0.15
82
80
82
78
±1 ±500
±1
1000
VCC - 1.2
102
pA
pA
M
V
dB
102
4 _______________________________________________________________________________________

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SOT23, Very High Precision, 3V/5V
Rail-To-Rail Op Amps
ELECTRICAL CHARACTERISTICS (SOT23-6) (continued)
(VCC = +2.4V to +5.5V, VEE = 0, VCM = 0, VOUT = VCC/2, RL = 100kto VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical
values are at VCC = +5V and TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Power-Supply Rejection Ratio
PSRR
VCC = +2.4V to
+5.5V
VCC = +5V, RL
connected to
VCC/2,
TA = +25°C
TA = +25°C
TA = TMIN to TMAX
RL = 100k,
VOUT = 15mV to
(VCC - 50mV)
RL = 1k,
VOUT = 0.15V
to (VCC - 0.3V)
97 120
95
110 128
100 114
dB
Large-Signal Voltage Gain
AVOL
VCC = +5V, RL
connected to
VCC/2,
TA = TMIN to
TMAX
VCC = +3V, RL
connected to
VCC/2,
TA = +25°C
VCC = +3V, RL
connected to
VCC/2,
TA = TMIN to
TMAX
RL = 100k, VOUT =
15mV to (VCC - 50mV)
RL = 1k,
VOUT = 0.15V to
(VCC - 0.3V)
RL = 100k,
VOUT = 15mV to
(VCC - 50mV)
RL = 1k,
VOUT = 0.15V to
(VCC - 0.3V)
RL = 100k,
VOUT = 15mV to
(VCC - 50mV)
RL = 1k,
VOUT = 0.15V to
(VCC - 0.3V)
110
95
110 128
100 114
105
95
dB
Output Voltage Swing
VOUT
VCC = +5V,
RL connected to VCC/2,
RL = 100k
VCC = +5V,
RL connected to VCC/2,
RL = 1k
VCC - VOH
VOL - VEE
VCC - VOH
VOL - VEE
2 10
3 10
150 250
50 100
mV
Output Short-Circuit Current
Gain-Bandwidth Product
Slew Rate
IOUT(SC)
Shorted to VEE
Shorted to VCC
GBWP RL = , CL = 15pF
SR
VCC = +5V,
VOUT = 4V step
MAX4236
MAX4237
MAX4236
MAX4237
10
mA
30
1.7
MHz
7.5
0.3
V/µs
1.3
_______________________________________________________________________________________ 5