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