EVAL-ADE7755ZEB【PDF 1/12 页】BOARD EVALUATION FOR AD7755

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Evaluation Board Documentation

AD7751/AD7755 Energy Metering IC

EVAL-AD7751/AD7755EB

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

LED Indicators on Logic Outputs for Fault (AD7751

Only), REVP and CF

Optically Isolated Output for Calibration/Test Purposes

External Reference Option Available for Reference

Evaluation

GENERAL DESCRIPTION

The AD7751 and AD7755 are high accuracy energy measurement

ICs. The part specifications surpass the accuracy requirements

as quoted in the IEC1036 standard. The AD7751 incorporates

a novel fault detection scheme that both warns of fault condi-

tions with the logic output FAULT but allows the AD7751 to

continue accurate billing during a fault event. The AD7751

by more than 12.5%. Billing is continued using the larger of the

two currents. The FAULT output is connected to an LED on

the evaluation board.

The AD7751 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 output

gives instantaneous real power information. This output is in-

tended to be used for calibration purposes. The evaluation

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

optoisolator. The REVP logic output goes high when negative

real power is detected. This causes an LED on the evaluation

board to switch on.

The AD7751/AD7755 evaluation board can easily be converted

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

the connection of the appropriate transducers. A large amount

of prototype area is made available on the evaluation board for

this purpose.

does this by continuously monitoring both the phase and neutral

(return) currents. A fault is indicated when these currents differ

FUNCTIONAL BLOCK DIAGRAM

AGND AVDD

V1A (AD7751)

DGND DVDD

VCC

V1A/NC*

NC* (AD7755)

V1N

V1B/V1P

V1N (AD7751)

V1N (AD7755)

V1B (AD7751)

V1P (AD7755)

AD7751/

AD7755

74HC08

FAULT

REVP

V2N

V2P

VPLUS

AD780

H11L1

CFOUT

GND

*NC = NO CONNECT

PROTOTYPE

AREA

REV. 0

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

otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700 World Wide Web Site: http://www.analog.com

Fax: 781/326-8703 ? Analog Devices, Inc., 1999

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