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Instrumentation amp touts precision at low gain

Posted: 22 Aug 2012     Print Version  Bookmark and Share

Keywords:precision  instrumentation  amplifier 

Analog Devices Inc. offers the AD8237 micro-power, zero-drift precision instrumentation amplifier as a cost- and power-efficient solution for precision signal and sensor conditioning in 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.

 AD8237

The AD8237 features input offset drift of < 0.3µV/�C, and an input signal range that extends 300mV beyond the supply rails. It claims maximum gain error and drift of 0.005 per cent and 0.5ppm/°C respectively, and CMRR of 114dB for precision measurement at a low gain. With a low quiescent supply current of just over 100µA, the amplifier is said to be well suited for signal conditioning bridge, temperature and other similar sensors used in low-power designs.

The AD8237 operates off a single supply voltage of 1.8V to 5.5V. The gain (1 to 1,000) is set by the ratio of two external resistors, which combined with industry leading gain error performance, provides superior gain accuracy over temperature.

The AD8237 also offers DC precision, with input offset voltage of 75µV and offset drift of 0.3µV/°C. Its supply current is 115µA. Its bandwidth (G=100) is 10kHz, and its input voltage noise is 1.5µVp-p

The AD8237 operates at the -40°C to 125°C temperature range is sampling now in an 8-lead MSOP. It is priced at Rs.50.82 ($0.93) each for 1,000 unit orders.





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