Micropower, Zero Drift, True Rail-to-Rail Instrumentation Amplifier

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.

Applications

* Bridge amplification

* Pressure measurement

* Medical instrumentation

* Thermocouple interface

* Portable systems

* Current measurement

* 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

See data sheet for additional features

* 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