3-Channel, Isolated,

Sigma-Delta ADC with SPI

Data Sheet

ADE7912/ADE7913

Rev. C

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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

APPLICATIONS

Shunt-based polyphase meters

Power quality monitoring

Solar inverters

Process monitoring

Protective devices

Isolated sensor interfaces

Industrial PLCs

TYPICAL APPLICATIONS CIRCUIT

NEUTRAL

PHASE

C

ISOLATION

BARRIER

LOAD

PHASE

A

EARTH

PHASE

B

PHASE A

ADE7912/

ADE7913

IP

IM

V1P

VM

V2P

3.3V

PHASE B

ADE7912/

ADE7913

IP

IM

V1P

VM

V2P

3.3V

PHASE C

ADE7912/

ADE7913

IP

IM

V1P

VM

V2P

3.3V

NEUTRAL

LINE

ADE7912/

ADE7913

(OPTIONAL)

IP

IM

V1P

VM

V2P

3.3V

3.3V

Figure 1.

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.

1

Protected by U.S. Patents 5,952,849; 6,873,065; 7,075,329; 6,262,600; 7,489,526; 7,558,080; 8,892,933. Other patents are pending.