Electronic Design

Differential Amplifier's Inputs Can Be Raised Or Lowered By 250 V

The AD629 is a feature-rich, high-input common-mode-voltage differential amplifier for motor control and power-supply current monitoring applications. Designed to operate in applications subject to high common-mode voltages (±250 V), the device can be used to extract a small differential signal, such as the output current of a motor measured across a shunt resistor, in the presence of a high common-mode voltage. Traditional amplifiers have an operating range close to the supply voltage (typically ±15 V), but the AD629's inputs can be raised or lowered more than 250 V above or below the supply voltage. This permits damage-free operation in applications with transients as high as ±500 V. By isolating the device's output circuitry from high-input voltages, the AD629 provides an easy solution for protecting a multitude of end-user equipment from irregular high voltages. Its operating temperature range is −40° to 85°C.

Priced at $4.00 each in 1000-piece quantities, the AD629 is available in two performance grades and two package options—an 8-pin DIP or an SOIC package.

Analog Devices, 3 Technology Way, P.O. Box 9106, Norwood, MA 02062-9106; (781) 329-4700; fax (781) 329-1241; Internet: www.analog.com.

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