AD7751AARS

Overview

The AD7751AARS is a high-accuracy, fault-tolerant single-phase electrical energy measurement integrated circuit designed for 2-wire distribution systems. It features proprietary analog-to-digital converters and digital signal processing to ensure precision across wide environmental variations. The device supports IEC 687/1036 standards with less than 0.1% error over a dynamic range of 500 to 1. It provides average real power on frequency outputs F1 and F2, while the high-frequency output CF supplies instantaneous real power for calibration. The IC includes continuous monitoring of phase and neutral currents for fault detection.

Feature Summary

• Continuous monitoring of phase and neutral currents enables on-chip fault detection in 2-wire distribution systems.
• Programmable gain amplifier in the current channel allows the use of small shunt and burden resistance values.
• Direct drive capability for electromechanical counters and 2-phase stepper motors via dedicated frequency outputs.
• On-chip power supply monitoring and creep protection (no-load threshold) enhance system reliability.

Applications

• Single-phase electricity metering in 2-wire distribution networks
• Calibration of energy meters using instantaneous power outputs
• Drive interfaces for electromechanical energy counters

Procurement Notes

Verify the specific suffix 'AARS' against official Analog Devices documentation to confirm package type and temperature grade. Ensure compatibility with 5V single-supply operation and SPI interface requirements. Confirm RoHS compliance status for the specific manufacturing lot. Validate that the component meets IEC 687/1036 accuracy standards required for your application.

Selection Notes

Select this component for applications requiring high accuracy in single-phase energy measurement with built-in fault tolerance. It is suitable where direct drive of mechanical counters is needed or when precise instantaneous power data is required for calibration. Consider the 5V supply constraint and SSOP package dimensions during PCB layout.

Part Context

The AD7751 series belongs to Analog Devices' specialized energy metering IC family. These devices integrate analog front-end conditioning, ADCs, and DSP cores to simplify the design of smart meters. The ADE7751 variant specifically targets single-phase applications, offering features like neutral current monitoring which distinguishes it from basic voltage/current measurement chips.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.