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

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

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)

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 1k

Ω Load

o 350µA Quiescent Current

o Gain-Bandwidth Product

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

SOT23, Very High Precision, 3V/5V

Rail-to-Rail Op Amps

________________________________________________________________ Maxim Integrated Products

1

TOP VIEW

IN-

IN+

16

5

SHDN

OUT

MAX4236

MAX4237

SOT23-6

2

34

1

2

3

4

8

7

6

5

OUT

N.C.

IN+

IN-

N.C.

MAX4236A/B

MAX4237A/B

SO-8/

µMAX

SHDN

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.

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

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