ANALOG DEVICES ADE7880 Service Manual

ADE7880—Polyphase Energy Metering IC

Includes High Accuracy Harmonic Analysis

Features

• Supports IEC 62053-21,

IEC 62053-22, IEC 62053-23,
EN 50470-1, EN 50470-3, and
ANSI C12.20 standards

• Supports IEC 61000-4-7 Class I

and II accuracy specification

• Supplies rms, active, reactive and

apparent powers, power factor,
THD + N and harmonic distortion
of all harmonics within 2.8 KHz
pass band

• Supports current transformer

and di/dt current sensors

Parameter Error Rate Dynamic Range @ TA = 25°C

Harmonic voltage/current rms <1% error 2000:1

Harmonic active/reactive powers <1% error 2000:1

Active/reactive energy <0.1% error 1000:1

Active/reactive energy <0.2% error 5000:1

Voltage/current rms <0.1% error 1000:1

• 10 ppm/°C typical reference drift

with external overdrive capability

• 40-lead lead frame chip scale

package (LFCSP), Pb-free, pin
for pin compatible with ADE7854,

ADE7858, ADE7868, and ADE7878

• Wide-supply voltage operation:

2.4 V to 3.7 V

• Operating temperature:

−40° to +85°C

The ADE7880 is a high accuracy, 3-phase electrical energy measurement
IC featuring an adaptive real time monitoring (ARTM) harmonic engine.
ARTM is capable of monitoring three user selectable harmonics, in addition
to the fundamental. ARTM automatically tracks fundamental frequency and
provides real-time harmonic measurement updates. Harmonic analysis
includes current rms, voltage rms, active, reactive, and apparent powers,
power factor, harmonic distortion, and total harmonic distortion plus noise
(

THD + N) calculations.

The ADE7880 incorporates seven second-order Σ-Δ ADCs, a digital
integrator, reference circuitry, and all the signal processing required to
perform total (fundamental and harmonic) active, fundamental active,
fundamental reactive, and apparent energy measurement and rms
calculations.

The ADE7880 is suitable to measure active, reactive, and apparent energy
in various 3-phase configurations, such as wye or delta services, with
both three and four wires. This metering IC provides system calibration
features for each phase: rms and energy offset correction, phase calibration,
and gain calibration.

The ADE7880 supports IEC 62053-21, IEC 62053-22, IEC 62053-23,
EN 50470-1, EN 50470-3, ANSI C12.20, and IEC 61000-4-7 standards.

The ADE7880 is pin compatible with the popular ADE7878, ADE7868,

ADE7858, and ADE7854 3-phase energy metering ICs.

analog.com/energymeter

Functional Block Diagram

27

CLKIN

28

CLKOUT

13

ICP

14

ICN

19

VCP18VN

9

IBP

PGA3

PGA3

PGA1

PGA1

12

IBN

22

VBP

ADC

ADC

ADC

ADC

ADC

PGA3

PGA1

PGA2

ADC

ADC

16

INN

15

INP

7

IAP

8

IAN23VAP

17

REF

IN/OUT

26

VDD

25

AGND

24

AVDD5DVDD

6

DGND

4

RESET

1.2V

REF

POR

LDO

LDO

APHCAL

AVGAIN

HPF

AIGAIN

HPF

DIGITAL

INTEGRATOR

NIGAIN

HPF

DIGITAL

INTEGRATOR

TOTAL/FUNDAMENTAL ACTIVE ENERGIES,

FUNDAMENTAL REACTIVE ENERGY,

APPARENT ENERGY, VOLTAGE/CURRENT RMS,

HARMONIC INFORMATION CALCULATION

FOR PHASE B (SEE PHASE A FOR DETAILED PATH)

TOTAL/FUNDAMENTAL ACTIVE ENERGIES,

FUNDAMENTAL REACTIVE ENERGY,

APPARENT ENERGY, VOLTAGE/CURRENT RMS,

HARMONIC INFORMATION CALCULATION

FOR PHASE C (SEE PHASE A FOR DETAILED PATH)

COMPUTATIONAL BLOCK FOR HARMONIC

INFORMATION ON NEUTRAL CURRENT

HPFEN OF

CONFIG3

HPFEN OF CONFIG3

HPFEN OF

CONFIG3

X

2

NIRMS

LPF

NIRMSOS

COMPUTATIONAL

BLOCK FOR

FUNDAMENTAL

ACTIVE AND

REACTIVE POWER

X

2

AIRMS

LPF

AIRMSOS

X

2

AVRMS

LPF

LPF

AVRMSOS

AVAGAIN

AWGAIN

AWATTOS

APGAIN

AFWATTOS

PHASE

A, B,

AND

C D ATA

DFC

CF1DEN

:

33

CF1

DFC

CF2DEN

:

34

CF2/HREADY

DFC

CF3DEN

:

35

CF3/HSCLK

APGAIN

AFVAROS

COMPUTATIONAL

BLOCK FOR
HARMONIC

INFORMATION

ON PHASE A

CURRENT AND

VOLTAGE

36

32

29

SPI/I2C

I2C

IRQ0

IRQ1

SCLK/SCL

38

MOSI/SDA

37

MISO/HSD

39

SS/HSA

HSDC

DIGITAL SIGNAL

PROCESSOR

General Description

The ADE7880 ARTM features complete harmonic analysis including magnitude and phase information. ARTM also computes
harmonic distortion relative to the fundamental, as well as THD + N. Harmonic analysis data can be accessed in real time using a
burst mode transfer via an SPI interface.

The ADE7880 waveform sample registers allow access to all ADC outputs. This device also incorporates power quality measurements
such as short duration low or high voltage detections, short duration high current variations, line voltage period measurement, and
angles between phase voltages and currents. Two serial interfaces can be used for communication: SPI or I2C. A dedicated high speed
interface HSDC (high speed data capture) port can be used in conjunction with I2C to provide access to the ADC outputs and real-time
power information. Two interrupt request pins, IRQ0 and IRQ1, indicate that an enabled interrupt event has occurred. The CF1, CF2, and
CF3 logic outputs provide a wide choice of power information: total/fundamental active/reactive power, total apparent power, or sum of
current rms values.

ADE7880 Harmonic Calculations

PHASE

SELECTION

A OR B OR C

OR N

IA, VA
IB, VB

IC, VC

IN, ISUM

TIME BASE, UPDATE RATE,

I2C refers to a communications protocol originally
developed by Philips Semiconductors (now NXP
Semiconductors).

©2011 Analog Devices, Inc. All rights reserved.
Trademarks and registered trademarks are the
property of their respective owners.

Printed in the U.S.A. PH10189-2-9/11

𝚹

𝚹

HARMONIC

INDEXES

ZYX

HARMONIC

COMPUTATION

ENGINE

AND DATA INTERFACE

OPTIONS

3 HARMONICS AND FUNDAMENTAL RESULTS

WATT I

VAR V

POWER FACTOR

RMS

HARMONIC DISTORTION

RMS

VA THD + N

NEUTRAL AND ISUM RESULTS

I

RMS

ISUM

RMS

analog.com/energymeter

27

PM0

28

PM1

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