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.
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)
(R
L
= 100kΩ)
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 1kΩ Load
o
350µA Quiescent Current
o
Gain-Bandwidth Product
1.7MHz (MAX4236, A
V
= 1V/V)
7.5MHz (MAX4237, A
V
= 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
MAX4236/MAX4237
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.
Ordering Information
PART
MAX4236EUT-T
MAX4236AEUA
MAX4236BEUA
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
Pin Configurations
TOP VIEW
OUT 1
6
V
CC
N.C.
IN-
IN+
V
EE
2
V
EE
1
2
3
4
8
7
SHDN
V
CC
OUT
N.C.
MAX4236AESA
MAX4236BESA
MAX4237EUT-T
MAX4237AEUA
MAX4237BEUA
MAX4237AESA
MAX4237BESA
MAX4236
MAX4237
5
SHDN
MAX4236A/B
MAX4237A/B
SO-8/µMAX
6
5
IN+ 3
4
IN-
SOT23-6
________________________________________________________________
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.
SOT23, Very High Precision, 3V/5V
Rail-To-Rail Op Amps
MAX4236/MAX4237
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
CC
- V
EE
) ......................................-0.3V to +6V
Analog Input Voltage (IN+ or IN-) ....(V
EE
- 0.3V) to (V
CC
+ 0.3V)
Logic Input Voltage (SHDN) ............(V
EE
- 0.3V) to (V
CC
+ 0.3V)
Current into Any Pin ............................................................20mA
Output Short-Circuit Duration....Continuous to Either V
CC
or V
EE
Continuous Power Dissipation (T
A
= +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)
(V
CC
= +2.4V to +5.5V, V
EE
= 0, V
CM
= 0, V
OUT
= V
CC
/2, R
L
= 100kΩ to V
CC
/2, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical
values are at V
CC
= +5V and T
A
= +25°C.) (Note 1)
PARAMETER
Supply Voltage Range
SYMBOL
V
CC
CONDITIONS
Guaranteed by the PSRR test
V
CC
= +5V
Quiescent Supply Current
I
CC
V
CC
= +3V
V
CC
= +5V,
Grade A
Input Offset Voltage
V
OS
V
CC
= +5V,
Grade B
V
CC
= +5V
(Note 3)
(Note 2)
(Note 2)
Differential or common mode
Guaranteed by the CMRR test
V
CC
= +5V;
-0.15V
≤
V
CM
≤
(V
CC
- 1.2V)
V
CC
= +3.0V;
-0.15V
≤
V
CM
≤
(V
CC
- 1.2V)
Power-Supply Rejection Ratio
PSRR
V
CC
= +2.4V to
+5.5V
T
A
= +25
o
C
T
A
= T
MIN
to T
MAX
T
A
= +25 C
TA = T
MIN
to T
MAX
T
A
= +25
o
C
T
A
= T
MIN
to T
MAX
o
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
In normal mode
In shutdown mode
In normal mode
In shutdown mode
T
A
= +25 C
T
A
= T
MIN
to T
MAX
T
A
= +25
o
C
T
A
= T
MIN
to T
MAX
Grade A
Grade B
o
µA
µV
Input Offset Voltage Temperature
Coefficient
Input Bias Current
Input Offset Current
Input Resistance
Input Common-Mode Voltage
TCV
OS
I
B
I
OS
R
IN
V
CM
µV/°C
pA
pA
MΩ
-0.15
84
80
102
V
CC
- 1.2
V
Common-Mode Rejection Ratio
CMRR
dB
82
78
97
95
120
dB
102
2
_______________________________________________________________________________________
SOT23, Very High Precision, 3V/5V
Rail-To-Rail Op Amps
ELECTRICAL CHARACTERISTICS (SO-8 and µMAX-8) (continued)
(V
CC
= +2.4V to +5.5V, V
EE
= 0, V
CM
= 0, V
OUT
= V
CC
/2, R
L
= 100kΩ to V
CC
/2, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical
values are at V
CC
= +5V and T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
V
CC
= +5V, R
L
connected to
V
CC
/2,
T
A
= +25
o
C
V
CC
= +5V, R
L
connected to
V
CC
/2,
T
A
= T
MIN
to
T
MAX
Large-Signal Voltage Gain
A
VOL
V
CC
= +3V, R
L
connected to
V
CC
/2,
T
A
= +25
o
C
V
CC
= +3V, R
L
connected to
V
CC
/2,
T
A
= T
MIN
to
T
MAX
CONDITIONS
R
L
= 100kΩ, V
OUT
=
15mV to (V
CC
- 50mV)
R
L
= 1kΩ, V
OUT
=
0.15V to (V
CC
- 0.3V)
R
L
= 100kΩ, V
OUT
=
15mV to (V
CC
- 50mV)
R
L
= 1kΩ,
V
OUT
= 0.15V
to (V
CC
- 0.3V)
R
L
= 100kΩ, V
OUT
=
15mV to (V
CC
- 50mV)
R
L
= 1kΩ,
V
OUT
= 0.15V
to (V
CC
- 0.3V)
R
L
= 100kΩ, V
OUT
=
15mV to (V
CC
- 50mV)
R
L
= 1kΩ,
V
OUT
= 0.15V
to (V
CC
- 0.3V)
V
CC
- V
OH
V
OL -
V
EE
V
CC
- V
OH
V
OL -
V
EE
MIN
110
TYP
128
MAX
UNITS
MAX4236/MAX4237
105
114
110
100
dB
110
128
100
114
105
95
V
CC
= +5V,
R
L
connected to V
CC
/2,
R
L
= 100kΩ
Output Voltage Swing
V
OUT
V
CC
= +5V,
R
L
connected to V
CC
/2,
R
L
= 1kΩ
Output Short-Circuit Current
Gain-Bandwidth Product
Slew Rate
Settling Time
Total Harmonic Distortion
I
OUT(SC)
GBWP
SR
t
S
THD
Shorted to V
EE
Shorted to V
CC
R
L
=
∞,
C
L
= 5pF
V
CC
= +5V, V
OUT
= 4V step
V
OUT
settling to within
0.01%
2
3
150
50
10
30
10
10
mV
250
100
mA
MHz
V/µs
µs
%
MAX4236
MAX4237
MAX4236
MAX4237
MAX4236
MAX4237
1.7
7.5
0.3
1.3
1
1
0.001
f = 5kHz, V
OUT
= 2Vp-p, V
CC
= +5V
R
L
= 10kΩ
_______________________________________________________________________________________
3
SOT23, Very High Precision, 3V/5V
Rail-To-Rail Op Amps
MAX4236/MAX4237
ELECTRICAL CHARACTERISTICS (SO-8 and µMAX-8) (continued)
(V
CC
= +2.4V to +5.5V, V
EE
= 0, V
CM
= 0, V
OUT
= V
CC
/2, R
L
= 100kΩ to V
CC
/2, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical
values are at V
CC
= +5V and T
A
= +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
t
(SH)
t
(EN)
SYMBOL
C
IN
e
n
e
np-p
C
LOAD
I
OUT(SH)
V
IL
V
IH
SHDN
= V
EE
or V
CC
R
L
= 1kΩ
R
L
= 1kΩ
0.7
✕
V
CC
1
1
4
3
f = 100kHz
f = 1kHz
f = 0.1Hz to 10Hz
No sustained oscillations
MAX4236
MAX4237
CONDITIONS
MIN
TYP
7.5
14
0.2
200
200
±0.01
±1.0
0.3
✕
V
CC
MAX
UNITS
pF
nV/√Hz
µVp-p
pF
µA
V
V
µA
µs
µs
Device in shutdown mode (SHDN = V
EE
)
V
OUT
= 0 to V
CC
ELECTRICAL CHARACTERISTICS (SOT23-6)
(V
CC
= +2.4V to +5.5V, V
EE
= 0, V
CM
= 0, V
OUT
= V
CC
/2, R
L
= 100kΩ to V
CC
/2, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical
values are at V
CC
= +5V and T
A
= +25°C.) (Note 1)
PARAMETER
Supply Voltage Range
SYMBOL
V
CC
CONDITIONS
Guaranteed by the PSRR test
V
CC
= +5V
Quiescent Supply Current
I
CC
V
CC
= +3V
Input Offset Voltage
Input Offset Voltage Temperature
Coefficient (Note 2)
Input Bias Current
Input Offset Current
Input Resistance
Input Common-Mode Voltage
V
OS
V
CC
= +5V
In normal mode
In shutdown mode
In normal mode
In shutdown mode
T
A
= +25°C
T
A
= T
MIN
to T
MAX
±0.6
±1
±1
1000
-0.15
82
80
82
78
102
102
dB
V
CC
- 1.2
MIN
2.4
350
0.1
350
0.1
±5
TYP
MAX
5.5
440
2
440
2
±50
±600
±5.5
±500
µV
µA
UNITS
V
TCV
OS
I
B
I
OS
R
IN
V
CM
V
CC
= +5V
(Note 2)
(Note 2)
Differential or common mode
Guaranteed by the CMRR test
V
CC
= +5V, -0.15V
≤
V
CM
≤
(V
CC
- 1.2V)
VCC = +3.0V; -0.15V
≤
V
CM
≤
(V
CC
- 1.2V)
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
µV/°C
pA
pA
MΩ
V
Common-Mode Rejection Ratio
CMRR
4
_______________________________________________________________________________________
SOT23, Very High Precision, 3V/5V
Rail-To-Rail Op Amps
ELECTRICAL CHARACTERISTICS (SOT23-6) (continued)
(V
CC
= +2.4V to +5.5V, V
EE
= 0, V
CM
= 0, V
OUT
= V
CC
/2, R
L
= 100kΩ to V
CC
/2, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical
values are at V
CC
= +5V and T
A
= +25°C.) (Note 1)
PARAMETER
Power-Supply Rejection Ratio
SYMBOL
PSRR
CONDITIONS
V
CC
= +2.4V to
+5.5V
T
A
= +25°C
T
A
= T
MIN
to T
MAX
R
L
= 100kΩ,
V
OUT
= 15mV to
(V
CC
- 50mV)
R
L
= 1kΩ,
V
OUT
= 0.15V
to (V
CC
- 0.3V)
R
L
= 100kΩ, V
OUT
=
15mV to (V
CC
- 50mV)
R
L
= 1kΩ,
V
OUT
= 0.15V to
(V
CC
- 0.3V)
R
L
= 100kΩ,
V
OUT
= 15mV to
(V
CC
- 50mV)
R
L
= 1kΩ,
V
OUT
= 0.15V to
(V
CC
- 0.3V)
R
L
= 100kΩ,
V
OUT
= 15mV to
(V
CC
- 50mV)
R
L
= 1kΩ,
V
OUT
= 0.15V to
(V
CC
- 0.3V)
V
CC
- V
OH
V
OL
- V
EE
V
CC
- V
OH
V
OL
- V
EE
MIN
97
95
110
128
TYP
120
dB
MAX
UNITS
MAX4236/MAX4237
V
CC
= +5V, R
L
connected to
V
CC
/2,
T
A
= +25°C
100
114
V
CC
= +5V, R
L
connected to
V
CC
/2,
TA = T
MIN
to
T
MAX
Large-Signal Voltage Gain
A
VOL
V
CC
= +3V, R
L
connected to
V
CC
/2,
T
A
= +25°C
110
95
dB
110
128
100
114
V
CC
= +3V, R
L
connected to
V
CC
/2,
T
A
= T
MIN
to
T
MAX
105
95
V
CC
= +5V,
R
L
connected to V
CC
/2,
R
L
= 100kΩ
Output Voltage Swing
V
OUT
V
CC
= +5V,
R
L
connected to V
CC
/2,
R
L
= 1kΩ
Shorted to V
EE
Output Short-Circuit Current
I
OUT(SC)
Shorted to V
CC
Gain-Bandwidth Product
Slew Rate
GBWP
SR
R
L
=
∞,
C
L
= 15pF
V
CC
= +5V,
V
OUT
= 4V step
2
3
150
50
10
10
10
mV
250
100
mA
30
MAX4236
MAX4237
MAX4236
MAX4237
1.7
7.5
0.3
1.3
MHz
V/µs
_______________________________________________________________________________________
5
