Current-sense amplifier combines zero drift and high bandwidth

NORWOOD, USA: Analog Devices Inc. (ADI) released for general availability the newest addition to its popular current-sense-amplifier product line.

The AD8218 zero-drift, bi-directional current-sense amplifier offers design engineers a precision current-sense amplifier with the unique combination of high bandwidth and the lowest drift currently available in the market in a low-cost package. Using a proprietary CMOS process, the AD8218 features a zero-drift core that provides an offset drift of ± 100n V/°C over a −40 °C to +125 °C temperature range, while maintaining a typical small signal bandwidth of 500 kHz.

ADI’s newest zero-drift current-sense amplifier has a 20 V/V fixed gain with a maximum ±0.35 percent gain error over the entire temperature range. The AD8218 zero-drift precision amplifier’s input common-mode can vary from 4 V to 80 V and includes a built-in reference for optimal dynamic range in unidirectional current monitoring or the ability to easily offset the output for bidirectional current sensing.

Designed to operate with a wide variety of A/D converters, the AD8218 is designed into numerous high-side current-sensing signal chains, including base station, industrial motor control and computer power management applications. Other precision zero-drift current sense amplifiers in the product family include the AD8217 high resolution, zero-drift current shunt monitor and the AD8219 zero-drift, unidirectional current shunt monitor.