GENERAL DESCRIPTION
The ADE7761A is a high accuracy, fault-tolerant, electrical energy measurement IC intended for use with 2-wire distribution systems. The part specifications surpass the accuracy requirements as quoted in the IEC 62053-21 standard. The only analog circuitry used on the ADE7761A is in the ADCs and reference circuit. All other signal processing (such as multiplication and filtering) is carried out in the digital domain. This approach provides superior stability and accuracy over extremes in environmental conditions and over time. The ADE7761A incorporates a fault detection scheme similar to the ADE7751 by continuously monitoring both phase and neutral currents. A fault is indicated when the currents differ by more than 6.25%.

FEATURES
   High accuracy, active energy measurement IC supports
      IEC 62053-21
   Less than 0.1% error over a dynamic range of 500 to 1
   Supplies active power on the frequency outputs, F1 and F2
   High frequency output CF is intended for calibration and
      supplies instantaneous active power
   Continuous monitoring of the phase and neutral current
      allows fault detection in 2-wire distribution systems
   Current channels input level best suited for shunt and
      current transformer sensors
   Uses the larger of the two currents (phase or neutral) to
      bill—even during a fault condition
   Continuous monitoring of the voltage and current inputs
      allows missing neutral detection
   Uses one current input (phase or neutral) to bill when
      missing neutral is detected
   Two logic outputs (FAULT and REVP) can be used to indicate
      a potential miswiring, fault, or missing neutral condition
   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
   Reference 2.5 V ± 8% (drift 30 ppm/°C typical) with external
      overdrive capability
   Single 5 V supply, low power