Micropower, Zero Drift, True Rail-to-Rail

Instrumentation Amplifier

Data Sheet

AD8237

Rev. 0

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FEATURES

Gain set with 2 external resistors

Can achieve low gain drift at all gains

Ideal for battery powered instruments

Supply current: 115 µA

Rail-to-rail input and output

Zero input crossover distortion

Designed for excellent dc performance

Minimum CMRR: 106 dB

Maximum offset voltage drift: 0.3 µV/°C

Maximum gain error: 0.005% (all gains)

Maximum gain drift: 0.5 ppm/°C (all gains)

Input bias current: 1 nA guaranteed to 125°C

Bandwidth mode pin (BW) to adjust compensation

8 kV HBM ESD rating

RFI filter on-chip

Single-supply operation: 1.8 V to 5.5 V

8-lead MSOP package

APPLICATIONS

Bridge amplification

Pressure measurement

Medical instrumentation

Thermocouple interface

Portable systems

Current measurement

PIN CONFIGURATION

BW

1

+IN

2

–IN

3

8

FB

7

REF

6

5

AD8237

TOP VIEW

(Not to Scale)

+

–

–

+

Figure 1.

General

Purpose

Zero

Drift

Military

Grade

Micropower

Digital

Gain

AD8421

AD8237

AD620

AD8237

AD8250

AD8221/AD8222

AD8231

AD621

AD8420

AD8251

AD8220/AD8224

AD8293

AD524

AD8235/AD8236

AD8253

AD8228

AD8553

AD526

AD627

AD8231

AD8295

AD8556

AD624

AD8226

AD8557

GENERAL DESCRIPTION

The AD8237 is a micropower, zero drift, rail-to-rail input and

output instrumentation amplifier. The relative match of two

resistors sets any gain from 1 to 1000. The AD8237 has excellent

gain accuracy performance that can be preserved at any gain

with two ratio-matched resistors.

The AD8237 employs the indirect current feedback architecture to

achieve a true rail-to-rail capability. Unlike conventional in-amps,

the AD8237 can fully amplify signals with common-mode voltage

at or even slightly beyond its supplies. This enables applications

with high common-mode voltages to use smaller supplies and

save power.

The AD8237 is an excellent choice for portable systems. With a

minimum supply voltage of 1.8 V, a 115 µA typical supply current,

and wide input range, the AD8237 makes full use of a limited

power budget, yet offers bandwidth and drift performance suitable

for bench-top systems.

The AD8237 is available in an 8-lead MSOP package. Performance

is specified over the full temperature range of −40°C to +125°C.

6

5

4

3

2

1

–1

0

0

1

2

3

4

5

OUTPUT VOLTAGE (V)

TRADITIONAL IN-AMP

(RAIL-TO-RAIL OUT)

AD8237

G = 100