GENERAL DESCRIPTION

The ADE77681 is a high accuracy, electrical energy metering IC. It is a pin reduction version of the ADE7755, enhanced with a precise oscillator circuit that serves as a clock source to the chip. The ADE7768 eliminates the cost of an external crystal or resonator, thus reducing the overall cost of a meter built with this IC. The chip directly interfaces with the shunt resistor.

FEATURES

On-chip oscillator as clock source

High accuracy, supports 50 Hz/60 Hz IEC62053-21

Less than 0.1 error over a dynamic range of 500 to 1

Supplies positive-only average real power on frequency

outputs F1 and F2

High frequency output CF calibrates and supplies

instantaneous, positive-only real power

Logic output REVP indicates potential miswiring or negative

power

Direct drive for electromechanical counters and 2-phase

stepper motors (F1 and F2)

Proprietary ADCs and DSPs provide high accuracy over

large variations in environmental conditions and time

On-chip power supply monitoring

On-chip creep protection (no-load threshold)

On-chip reference 2.45 V (20 ppm/°C typical) with

external overdrive capability

Single 5 V supply, low power (20 mW typical)

Low cost CMOS process