Analog Devices offers digitally calibrated, multi-function, three-phase energy metering IC

Nov. 5, 2002 — With the addition of the ADE7754 to Analog Devices’ Energy IC (ADE) family, meter manufacturers now have a single chip solution to meet the demands of the high-end three-phase, multi-function electricity metering market.

The ADE7754 meets the growing demand to provide more information about three-phase connections by supplying active energy, apparent energy, voltage rms, current rms and waveform samples data. The ADE7754 includes digital power, phase and offset calibration registers for all three-phases.

These registers are adjustable through the serial interface and allow the manufacturer to quickly calibrate errors introduced by external components. A fully automated, low cost, high throughput production line can be realized with the ADE7754. This obsoletes the use of large voltage divider networks and swapping resistors to calibrate the meter.

The ADE7754 is an extension of the ADE product family, which has proven reliability with over 50 million electricity meters deployed to the field. It features excellent accuracy with less than 0.1 percent linearity error over a dynamic range of 1000 to 1, and it operates on a single 5 V power supply. The analog front-end includes on-chip phase compensation, which is optimized for direct interface with current transformers (CT).

The ADE7754 is compatible with 3-wire and 4-wire distribution systems and can be used in three-phase commercial and industrial revenue meters or submeters, three-phase motors or generators, and industrial control applications.

Additional features of the ADE7754 include: no-load threshold; power supervisory circuitry; on-chip temperature sensor; line period measurement; negative power flow indication; peak voltage and current measurement; and high frequency calibration output.

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