AD71056 is an energy metering IC with integrated oscillator and reverse polarity indication
The AD71056 energy‑metering IC integrates a precise on‑chip oscillator, reference, and power‑supply monitoring to provide accurate real‑power information without an external crystal. It offers low‑frequency outputs (F1, F2) for driving electromechanical counters or stepper motors, and a high‑frequency CF output for instantaneous power calibration.
The device operates from a single 5 V supply, supports IEC‑62053‑21 accuracy requirements, and includes features such as reverse‑polarity indication, no‑load threshold protection, and on‑chip reference (2.45 V). Pin configurations, timing characteristics, and absolute maximum ratings are detailed for designers.
| Supply voltage (Vop) | 5 V ±5 % |
|---|---|
| Measurement error (Channel V1) | 0.1 % reading typical |
| Logic input high voltage (Vint) | 24 V min |
| Logic output high voltage (F1/F2) | 45 V min |
| Operating temperature range | -40 °C to +85 °C |
| On‑chip reference voltage | 2.45 V nominal |
| Maximum differential input (Channel V2) | +165 mV max |
The AD71056 operates from –40 °C to +85 °C.
The on‑chip reference voltage is 2.45 V nominal.
Channel V2 can accept a maximum differential input of +165 mV.