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Sensor amplifier integrates on-chip EMI filtering

Norwood, Mass. — Analog Devices Inc.'s latest sensor amplifier for automotive and industrial applications features internal electromagnetic interference (EMI) filtering, a very wide temperature range, low offset voltage and drift, and open and shorted wire protection.

The AD8556 sensor amplifier is intended for pressure sensors in anti-lock brake systems (ABS), occupant detection systems, fuel level sensors, transmission controls, and precision strain or pressure gauges.

In addition, the AD8556 is a zero-drift, sensor amplifier with digitally programmable gain and output offset. Priced up to one-third less than competing solutions, the sensor amplifier is the industry's only sensor amplifier to pack unprecedented combinations of performance into a 4mm x 4mm LFCSP package, according to the company.

ADI's AD8556 is specified over an extended temperature range of -40°C to +140°C. On-chip EMI filtering reduces the number of external components and enables the amplifier to deliver high accuracy (see related graph below).

The AD8556 allows system designers to use software to automatically remove variations between sensors, eliminating the need for more expensive manual adjustments. Leveraging ADI's DigiTrim in-package trim technology, the device offers high DC accuracy at a low price. A serial data interface allows gain to be digitally programmed over a wide range from 70 to 1,280.

To ensure the lowest drift and highest level of accuracy, the device offers extremely low input offset voltage of 10 μV max, very low input offset voltage drift of 65 nanoV/°C max, and very high DC and AC common-mode rejection ratio (CMRR) of 94 dB minimum. Output clamping can be set by an external reference, allowing
the AD8556 to drive lower voltage analog-to-digital converters (A/D converters).


The AD8556 is available now, operates from single-supply voltages
of 2.7 V to 5.5 V, and is packaged in either a 4mm x 4mm LFCSP or 8-lead SOIC. The LFCSP version is priced at $2.89 per unit in 1,000-piece quantities, and the SOIC version is priced at $2.85 per unit in same quantities. Click here for the AD8556 data sheet.

Analog Devices , 1-800-262-5643, www.Analog.com.

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