Instrumentation amplifier combines power efficiency and zero-drift accuracy for portable medical, instrumentation and consumer devices

August 15, 2012 // By Paul Buckley
Analog Devices, Inc. has introduced the AD8237 micro-power, zero-drift precision instrumentation amplifier, offering a power-efficient solution for precision signal and sensor conditioning at a competitive price.

The AD8237 features a low input offset drift (< 0.3 µV/ºC) and an industry leading input signal range that extends 300 mV beyond the supply rails. Combined with a maximum gain error and drift of 0.005% and 0.5 ppm/°C respectively, and CMRR (common-mode rejection ratio) of 114 dB, the device offers an unmatched level of precision measurement, even at low gain.

With a low quiescent supply current of just over 100 µA, the amplifier is well suited for signal conditioning bridge, temperature and other similar sensors used in low-power designs. Target applications for the AD8237 include portable and battery-powered healthcare, consumer and precision instrumentation equipment such as infusion pumps, mobile blood pressure monitors, 4- to 20-mA sensors, gaming peripherals and consumer weigh scales.

The AD8237 operates off a single supply voltage of 1.8 V to 5.5 V and ships in a compact MSOP-8 package.  The gain (1 to 1000) is set by the ratio of two external resistors, which combined with industry leading gain error performance, provides superior gain accuracy over temperature.

Availability and Pricing

Samples of the AD8237 packaged in an 8-lead MSOP are available now and are priced at $0.93 each per 1,000.

More information about the AD8237 zero-drift precision instrumentation amplifier at