14 Aug 2012

Instrumentation amplifier from Analogue Devices targets portable medical applications

Analog Devices has introduced the AD8237 micro-power, zero-drift precision instrumentation amplifier, said to offer a power-efficient solution for precision signal and sensor conditioning.

The AD8237 features a low input offset drift (< 0.3µV/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 promises 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 device 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.

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