MAXIM MAX4236, MAX4237 Technical data

General Description

The MAX4236/MAX4237 are high-precision op amps
that feature an exceptionally low offset voltage and off­set 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 gain­bandwidth 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

Features

♦ Ultra-Low Offset Voltage

20µV (max) at +25°C (Grade A)
50µV (max) at +25°C (Grade B, 6-Pin SOT23)

♦ 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)

♦ Ultra-Low 1pA Input Bias Current
♦ High Open-Loop Voltage Gain: 110dB (min)

(R

L

= 100kΩ)

♦ Compatible with +3V and +5V Single-Supply

Power Systems

♦ Ground Sensing: Input Common-Mode Range

Includes Negative Rail

♦ Rail-to-Rail Output Swing into a 1kΩ Load
♦ 350µA Quiescent Current
♦ Gain-Bandwidth Product

1.7MHz (MAX4236, A

V

= 1V/V)

7.5MHz (MAX4237, A

V

= 5V/V)

♦ 200pF Capacitive Load Handling Capability
♦ Shutdown Mode: 0.1µA Quiescent Current,

Places Output in a High-Impedance State

♦ Available in Space-Saving SOT23 and µMAX

Packages

MAX4236/MAX4237

SOT23, Very High Precision, 3V/5V

Rail-to-Rail Op Amps

________________________________________________________________ Maxim Integrated Products 1

Pin Configurations

Ordering Information

19-2110; Rev 0; 8/01

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.

Rail-to-Rail is a registered trademark of Nippon Motorola, Inc.

TOP VIEW

OUT

16V

V

MAX4236

2

EE

MAX4237

34

SOT23-6

CC

5 SHDN

IN-IN+

N.C.

IN-

IN+

EE

1
2

MAX4236A/B

3

MAX4237A/B

4

SO-8/µMAX

8

SHDN

7

V

CC

6

OUT

5

N.C.V

PART TEMP. RANGE PIN-PACKAGE

MAX4236EUT-T -40°C to +85°C 6 SOT23-6

MAX4236AEUA -40°C to +85°C 8 µMAX
MAX4236BEUA -40°C to +85°C 8 µMAX
MAX4236AESA -40°C to +85°C 8 SO
MAX4236BESA -40°C to +85°C 8 SO
MAX4237EUT-T -40°C to +85°C 6 SOT23-6
MAX4237AEUA -40°C to +85°C 8 µMAX
MAX4237BEUA -40°C to +85°C 8 µMAX
MAX4237AESA -40°C to +85°C 8 SO
MAX4237BESA -40°C to +85°C 8 SO

MAX4236/MAX4237

SOT23, Very High Precision, 3V/5V
Rail-To-Rail Op Amps

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS (SO-8 and µMAX-8)

(VCC= +2.4V to +5.5V, VEE= 0, VCM= 0, V

OUT

= VCC/2, RL= 100kΩ to VCC/2, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical

values are at V

CC

= +5V and TA= +25°C.) (Note 1)

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)......................................-0.3V to +6V

Analog Input Voltage (IN+ or IN-)....(V

EE

- 0.3V) to (VCC+ 0.3V)

Logic Input Voltage (SHDN) ............(V

EE

- 0.3V) to (VCC+ 0.3V)

Current into Any Pin ............................................................20mA

Output Short-Circuit Duration....Continuous to Either V

CC

or V

EE

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

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Supply Voltage Range V

Quiescent Supply Current I

Input Offset Voltage V

Inp ut Offset V ol tag e Tem p er atur e
C oeffi ci ent

CC

CC

OS

TCV

Input Bias Current I
Input Offset Current I

OS

Input Resistance R

Guaranteed by the PSRR test 2.4 5.5 V

VCC = +5V

VCC = +3V

VCC = +5V,
Grade A

VCC = +5V,
Grade B

VCC = +5V

OS

(Note 3)

B

(Note 2) ±1 ±500 pA
(Note 2) ±1 pA
Differential or common mode 1000 MΩ

IN

In normal mode 350 440
In shutdown mode 0.1 2
In normal mode 350 440
In shutdown mode 0.1 2
TA = +25oC ±5 ±20
T

= T

MIN

to T

MAX

A

±150
TA = +25oC ±5 ±50
T

= T

MIN

to T

MAX

A

±340
Grade A ±0.6 ±2
Grade B ±0.6 ±4.5

µA

µV

µV/°C

Input Common-Mode Voltage V

CM

Common-Mode Rejection Ratio CMRR

Power-Supply Rejection Ratio PSRR

Guaranteed by the CMRR test -0.15 V

VCC = +5V;

-0.15V ≤ V

- 1.2V)

(V

CC

V

= +3.0V;

CC

-0.15V ≤ V

- 1.2V)

(V

CC

V

= +2.4V to

CC

+5.5V

CM

CM

≤

≤

TA = +25oC 84 102

T

= T

MIN

to T

MAX

A

80

TA = +25oC 82 102

TA = T

MIN

to T

MAX

78

TA = +25oC 97 120
T

= T

MIN

to T

MAX

A

95

- 1.2 V

C C

dB

dB

MAX4236/MAX4237

SOT23, Very High Precision, 3V/5V

Rail-To-Rail Op Amps

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (SO-8 and µMAX-8) (continued)

(VCC= +2.4V to +5.5V, VEE= 0, VCM= 0, V

OUT

= VCC/2, RL= 100kΩ to VCC/2, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical

values are at V

CC

= +5V and TA= +25°C.) (Note 1)

)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Large-Signal Voltage Gain A

VOL

RL = 100kΩ, V

VCC = +5V, R

L

15mV to (V

connected to

/2,

V

CC

T

= +25oC

A

VCC = +5V, R
connected to
V

/2,

CC

= T

MIN

to

T
T

A
MAX

L

RL = 1kΩ, V

0.15V to (V

RL = 100kΩ, V
15mV to (V

RL = 1kΩ,

= 0.15V

V

OUT

to (V

CC

RL = 100kΩ, V

VCC = +3V, R
connected to

/2,

V

CC

T

= +25oC

A

VCC = +3V, R
connected to
V

/2,

CC

= T

T

A

T

MAX

MIN

to

L

L

15mV to (V

R

= 1kΩ,

L

V

= 0.15V

OUT

to (V

CC

RL = 100kΩ, V
15mV to (V

RL = 1kΩ,

= 0.15V

V

OUT

to (V

CC

CC

OUT

CC

CC

- 0.3V)

CC

- 0.3V)

CC

- 0.3V)

=

OUT

- 50mV)

=

- 0.3V)

=

OUT

- 50mV)

=

OUT

- 50mV)

=

OUT

- 50mV)

110 128

105 114

110

100

dB

110 128

100 114

105

95

VCC = +5V,
R

connected to V

L

= 100kΩ

R

L

Output Voltage Swing V

OUT

VCC = +5V,

connected to VCC/2,

R

L

R

= 1kΩ

L

Output Short-Circuit Current I

OUT(SC

Shorted to V
Shorted to V

EE
CC

Gain-Bandwidth Product GBWP RL = ∞, CL = 5pF

Slew Rate SR VCC = +5V, V

V

OUT

Settling Time t

S

Total Harmonic Distortion THD

0.01%
f = 5kHz, V

R

= 10kΩ

L

OUT

settling to within

OUT

VCC - V

/2,

CC

V

OL - VEE

VCC - V

V

OL - VEE

MAX4236 1.7
MAX4237 7.5

= 4V step

MAX4236 0.3
MAX4237 1.3
MAX4236 1
MAX4237 1

= 2Vp-p, VCC = +5V

OH

OH

210

310

mV

150 250

50 100

10
30

mA

MHz

V/µs

µs

0.001 %

MAX4236/MAX4237

SOT23, Very High Precision, 3V/5V
Rail-To-Rail Op Amps

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (SO-8 and µMAX-8) (continued)

(VCC= +2.4V to +5.5V, VEE= 0, VCM= 0, V

OUT

= VCC/2, RL= 100kΩ to VCC/2, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical

values are at V

CC

= +5V and TA= +25°C.) (Note 1)

ELECTRICAL CHARACTERISTICS (SOT23-6)

(VCC= +2.4V to +5.5V, VEE= 0, VCM= 0, V

OUT

= VCC/2, RL= 100kΩ to VCC/2, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical

values are at V

CC

= +5V and TA= +25°C.) (Note 1)

)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Input Capacitance C
Input Voltage Noise Density e
Input Noise Voltage e

Capacitive Load Stability C

Shutdown Mode Output
Leakage

np-p

LOAD

I

OUT(SH

SHDN Logic Low V

SHDN Logic High V

SHDN Input Current SHDN = VEE or V

Shutdown Delay Time t
Shutdown Recovery Time t

(SH)
(EN)

f = 100kHz 7.5 pF

IN

f = 1kHz 14 nV/√Hz

n

f = 0.1Hz to 10Hz 0.2 µVp-p

No sustained oscillations

MAX4236 200
MAX4237 200

Device in shutdown mode (SHDN = VEE)
V

= 0 to V

OUT

IL

IH

CC

CC

RL = 1kΩ 1µs
RL = 1kΩ 4µs

±0.01 ±1.0 µA

✕

0.7
V

CC

13µA

0.3
V

CC

pF

✕

V

V

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Supply Voltage Range V

Quiescent Supply Current I

Input Offset Voltage V

Inp ut Offset V ol tag e Tem p er atur e
C oeffi ci ent ( N ote 2)

TCV

Input Bias Current I
Input Offset Current I
Input Resistance R
Input Common-Mode Voltage V

Common-Mode Rejection Ratio CMRR

Guaranteed by the PSRR test 2.4 5.5 V

CC

VCC = +5V

CC

VCC = +3V

VCC = +5V

OS

OSVCC

B

OS

IN

CM

= +5V ±0.6 ±5.5 µV/°C

(Note 2) ±1 ±500 pA
(Note 2) ±1 pA
Differential or common mode 1000 MΩ
Guaranteed by the CMRR test -0.15 V

VCC = +5V, -0.15V

≤ (VCC - 1.2V)

≤ V

CM

VCC = +3.0V; -0.15V

≤ (VCC - 1.2V)

≤ V

CM

In normal mode 350 440
In shutdown mode 0.1 2
In normal mode 350 440
In shutdown mode 0.1 2
TA = +25°C ±5 ±50

= T

MIN

to T

MAX

T

A

±600

- 1.2 V

C C

TA = +25°C 82 102
T

= T

MIN

to T

MAX

A

80
TA = +25°C 82 102
T

= T

MIN

to T

MAX

A

78

µA

µV

dB

MAX4236/MAX4237

SOT23, Very High Precision, 3V/5V

Rail-To-Rail Op Amps

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS (SOT23-6) (continued)

(VCC= +2.4V to +5.5V, VEE= 0, VCM= 0, V

OUT

= VCC/2, RL= 100kΩ to VCC/2, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical

values are at V

CC

= +5V and TA= +25°C.) (Note 1)

)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Power-Supply Rejection Ratio PSRR

Large-Signal Voltage Gain A

VOL

V

= +2.4V to

CC

+5.5V

TA = +25°C 97 120

T

= T

A

MIN

RL = 100kΩ,

= 15mV to

V

OUT

VCC = +5V, R
connected to
V

/2,

CC

= +25°C

T

A

VCC = +5V, R
connected to
V

/2,

CC

TA = T
T

MAX

MIN

to

L

L

(V

- 50mV)

CC

R

= 1kΩ,

L

= 0.15V

V

OUT

to (V

CC

RL = 100kΩ, V
15mV to (V

RL = 1kΩ,
V

= 0.15V to

OUT

- 0.3V)

(V

CC

RL = 100kΩ,
V

= 15mV to

VCC = +3V, R
connected to

/2,

V

CC

T

= +25°C

A

VCC = +3V, R
connected to

/2,

V

CC

T

= T

MIN

to

T

A
MAX

L

L

OUT

- 50mV)

(V

CC

R

= 1kΩ,

L

= 0.15V to

V

OUT

(V

- 0.3V)

CC

RL = 100kΩ,
V

= 15mV to

OUT

- 50mV)

(V

CC

RL = 1kΩ,

= 0.15V to

V

OUT

(V

- 0.3V)

CC

to T

- 0.3V)

CC

MAX

=

OUT

- 50mV)

95

110 128

100 114

110

95

110 128

100 114

105

95

dB

dB

VCC = +5V,

connected to VCC/2,

R

L

R

= 100kΩ

L

Output Voltage Swing V

OUT

VCC = +5V,
R

connected to VCC/2,

L

= 1kΩ

R

L

Shorted to V

Output Short-Circuit Current I

OUT(SC

Shorted to V

Gain-Bandwidth Product GBWP RL = ∞, CL = 15pF

V

Slew Rate SR

V

CC
OUT

= +5V,

= 4V step

EE

CC

VCC - V

- V

V

OL

VCC - V

V

- V

OL

OH

EE

OH

EE

210

310

150 250

50 100

10

30

MAX4236 1.7
MAX4237 7.5
MAX4236 0.3
MAX4237 1.3

mV

mA

MHz

V/µs