Preliminary Technical Data

PRELIMINARY TECHNICAL DATA

REV. PrF

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

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a

EVAL-ADE7757EB

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, USA

Tel: 781/329-4700

www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., June 2002

Evaluation Board Documentation

ADE7757 Energy Metering IC

FUNCTIONAL BLOCK DIAGRAM

FEATURES

Single +5 V Power Supply

Easy Connection of External Transducers via Screw

Terminals

Easy Modification of Signal Conditioning Components

Using PCB Sockets

Trim Pot for Analog Calibration of Meter Constant

Optically Isolated Output for Calibration/Test Purposes

External Reference Option Available for Reference

Evaluation

GENERAL DESCRIPTION

The ADE7757 is a high accuracy energy measurement IC

with integrated oscillator. The part specifications surpass

the accuracy requirements as quoted in the IEC1036 stan-

dard.

The ADE7757 supplies average real power information on the

low frequency outputs F1 and F2. These logic outputs may be

used to directly drive an electromechanical counter or interface

to an MCU. The evaluation board provides screw connectors

for easy connection to an external counter. The CF logic out-

put gives instantaneous real power information. This output is

intended to be used for calibration purposes. The evaluation

board allows this logic output to be connected to an LED or

optoisolator.

The ADE7757 evaluation board can easily be converted into

an energy meter by the addition of a local power supply and

the connection of the appropriate current sensor. A large

amount of prototype area is made available on the evaluation

board for this purpose.

V1P

V1N

ADE7757

VPLUS

VMINUS

CFOUT

F1

F2

VDD DGND

V2N

V2P

VCC

AD780

74HC08

CF

PROTOTYPE

AREA

H11L1

AGND