Analog – New instrumentation amplifier for portable medical and consumer devices (AD8237)

The AD8237, a new micro-power, zero-drift precision instrumentation amplifier has been introduced by Analog Devices, offering a power-efficient competitively-priced solution for precision signal and sensor conditioning.

The device features a low input offset drift (< 0.3µV/C) and an industry leading input signal range that extends 300mV beyond the supply rails. Combined with a maximum gain error and drift of 0.005% and 0.5ppm/C respectively, and CMRR (common-mode rejection ratio) of 114dB, the device offers an unmatched level of precision measurement, even at low gain. With a low quiescent supply current of just over 100µA, 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, 4mA to 20mA sensors, gaming peripherals and consumer weigh scales.

The AD8237 operates off a single supply voltage of 1.8V to 5.5V 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, says the company.

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