GENERAL DESCRIPTION

The ADE7757 is a high accuracy electrical energy measurement IC. It is a pin reduction version of the ADE7755 with an enhancement of a precise oscillator circuit that serves as a clock source to the chip. The ADE7757 eliminates the cost of an external crystal or resonator, thus reducing the overall cost of a meter *U.S. Patents built with this IC. The chip directly interfaces with the shunt resistor and operates only with ac input.

FEATURES

On-Chip Oscillator as Clock Source

High Accuracy, Supposes 50 Hz/60 Hz IEC 521/IEC 61036

Less than 0.1 Error over a Dynamic Range of 500 to 1

The ADE7757 Supplies Average Real Power on the

Frequency Outputs F1 and F2

The High Frequency Output CF Is Intended for

Calibration and Supplies Instantaneous Real Power

The Logic Output REVP Can Be Used to Indicate a

Potential Miswiring or Negative Power

Direct Drive for Electromechanical Counters and

2-Phase Stepper Motors (F1 and F2)

Proprietary ADCs and DSP 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 2.5 V (20 ppm/°C Typical)

with External Overdrive Capability

Single 5 V Supply, Low Power (20 mW Typical)

Low Cost CMOS Process

AC Input Only