ADE7769 Datasheet | Analog Devices

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 average real power on frequency outputs F1 and F2 High frequency output CF calibrates and supplies instantaneous real power CF output remains logic high when ADE7769 is under no-load threshold Logic output REVP indicates a 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 m W typical) Low cost CMOS process The ADE7769 specifications surpass the accuracy requirements of the IEC62053-21 standard. The AN-679 Application Note can be used as a basis for a description of an IEC61036 (equivalent to IEC62053-21) low cost, watt-hour meter reference design. The only analog circuitry used in the ADE7769 is in the Σ-Δ 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 time and extreme environmental conditions. The ADE7769 supplies average real power information on the low frequency outputs, F1 and F2. These outputs can be used to directly drive an electromechanical counter or interface with an MCU. The high frequency CF logic output, ideal for calibration purposes, provides instantaneous real power information. The ADE7769 includes a power supply monitoring circuit on the VDD supply pin. The ADE7769 remains inactive until the supply voltage on VDD reaches approximately 4 V. If the supply falls below 4 V, the ADE7769 also remains inactive and the F1, F2, and CF outputs are in their nonactive modes. Internal phase matching...