Zero-drift precision op amp

22 August 2007 Analogue, Mixed Signal, LSI

The AD8638 from Analog Devices is a 16 V zero-drift precision op amp designed for industrial instrumentation, automotive and sensor applications that must accommodate wide variations in temperature, power supply, load and input signal without introducing signal conditioning errors. It features 140 dB CMRR (common-mode rejection ratio) and 140 dB PSRR (power supply rejection ratio), a 10 μV offset voltage over temperature and a maximum offset drift of 80 nV/°C, alleviating the need for additional circuitry such as temperature correction loops. Claiming a four times faster output saturation recovery time than other op amps in its class, this op amp is ideal for applications such as sensors in harsh or ruggedised environments or temperature-sensitive feedback and control circuits that are designed to take frequent measurements, where the outputs are driven into the supply rails. The AD8638 is available in a SOT-23 package.

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