Energy metering IC with on-chip oscillator

8 May 2002 Analogue, Mixed Signal, LSI

Analog Devices' ADE7757, is a high accuracy electrical energy metering IC with an on-chip oscillator and direct stepper motor drive capability. This IC has similar functionality to its predecessor - the widely used ADE7755 - but does not require an external crystal or resonator. This reduces the overall cost of building a watt-hour meter. The ADE7757 is claimed to achieve superior accuracy, with less than 0,1% linearity error over a dynamic range of 500 to 1, and operates with a single 5 V power supply. It includes proprietary analog and digital circuitry to measure electrical energy usage over wide variations of environmental conditions and long periods of time. The chip directly interfaces with a shunt resistor and operates with AC input.

The small, full-scale analog input range allows the chip to interface to low-value shunt resistances without sacrificing dynamic range. Low frequency pulse outputs supply average real power information and can directly interface to a stepper motor counter display. In addition, synchronised high-frequency pulse outputs are available for calibration and test purposes. The high-frequency pulse outputs can also be used with a microcontroller or an automatic meter reading (AMR) module. ADI also has available an evaluation board to facilitate performance and functionality verifications.

Analog Data Products SA

011 531 1400

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