The ADE7761A is an energy metering IC with on-chip fault and missing neutral detection
The ADE7761A is a high‑accuracy, fault‑tolerant energy‑metering integrated circuit designed for 2‑wire distribution systems. It provides active‑power frequency outputs (F1, F2) and a calibration output (CF), supports IEC 62053‑21 accuracy, and includes built‑in fault and missing‑neutral detection.
The document details the functional block diagram, pin configuration, electrical specifications, timing characteristics, and application notes for interfacing the device to a microcontroller. It also covers performance limits, ESD precautions, and typical performance curves.
| Supply voltage (VDD) | 5 V ± 5% |
|---|---|
| Operating temperature range | -40°C to +85°C |
| Phase error between channels (capacitive) | ±0.05° (0.8° max) |
| Maximum differential input voltage | ±660 mV peak |
| Logic output high voltage | ≥4 V |
| Power‑supply rejection (frequency variation) | 0.01 % typ |
The device operates from a single 5 V supply with a tolerance of ±5 %.
It continuously monitors the input voltage; when no voltage is present, the FAULT pin goes high and the device continues billing using the active current signal.