GENERAL DESCRIPTION

The ADE7912/ADE79131 are isolated, 3-channel Σ-Δ ADCs for polyphase energy metering applications using shunt current sensors. Data and power isolation are based on the Analog Devices, Inc., iCoupler® technology. The ADE7912 features two ADCs, and the ADE7913 features three ADCs. The current ADC provides a 67 dB signal-to-noise ratio (SNR) over a 3 kHz signal bandwidth, whereas the voltage ADCs provide an SNR of 72 dB over the same bandwidth. One channel is dedicated to measuring the voltage across a shunt when the shunt is used for current sensing. Up to two additional channels are dedicated to measuring voltages, which are usually sensed using resistor dividers. One voltage channel can measure the temperature of the die via an internal sensor. The ADE7913 includes three channels: one current and two voltage channels. The ADE7912 has one voltage channel but is otherwise identical to the ADE7913.

FEATURES

Two (ADE7912) or three (ADE7913) isolated, Σ-Δ analog-to-digital converters (simultaneously sampling ADCs)

Integrated isoPower, isolated dc-to-dc converter

On-chip temperature sensor

4-wire SPI serial interface

Up to 4 ADE7912/ADE7913 devices clocked from a single crystal or an external clock

Synchronization of multiple ADE7912/ADE7913 devices

±31.25 mV peak input range for current channel

±500 mV peak input range for voltage channels

Reference drift: 10 ppm/°C typical

Single 3.3 V supply

20-lead, wide-body SOIC package with 8.3 mm creepage

Operating temperature: −40°C to +85°C

Safety and regulatory approvals

UL recognition

5000 V rms for 1 minute per UL 1577

CSA Component Acceptance Notice 5A

IEC 61010-1: 300 V rms

VDE certificate of conformity

DIN VDE V 0884-10 (VDE V 0884-10):2006-12

VIORM = 846 V peak

APPLICATIONS

Shunt-based polyphase meters

Power quality monitoring

Solar inverters

Process monitoring

Protective devices

Isolated sensor interfaces

Industrial PLCs