EVAL-ADE7751ZEB【PDF 1/16 页】BOARD EVALUATION FOR ADE7751

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FEATURES

High Accuracy, Surpasses 50 Hz/60 Hz IEC 687/1036

Less than 0.1% Error over a Dynamic Range of 500 to 1

Supplies Average Real Power on the Frequency

Outputs F1 and F2

High-Frequency Output CF Is Intended for Calibration

and Supplies Instantaneous Real Power

Continuous Monitoring of the Phase and Neutral

Current Allows Fault Detection in 2-Wire

Distribution Systems

ADE7751 Uses the Larger of the Two Currents (Phase

or Neutral) to Bill—Even During a Fault Condition

Two Logic Outputs (FAULT and REVP) Can Be Used to

Indicate a Potential Miswiring or Fault Condition

Direct Drive for Electromechanical Counters and

2-Phase Stepper Motors (F1 and F2)

A PGA in the Current Channel Allows the Use of Small

Values of Shunt and Burden Resistance

Proprietary ADCs and DSP Provide High Accuracy over

Large Variations in Environmental Conditions and Time

On-Chip Power Supply Monitoring

On-Chip Creep Protection (No Load Threshold)

On-Chip Reference 2.5 V 8% (30 ppm/ C Typical)

with External Overdrive Capability

Single 5 V Supply, Low Power (15 mW Typical)

Low-Cost CMOS Process

Energy Metering IC

with On-Chip Fault Detection

ADE7751 *

The only analog circuitry used in the ADE7751 is in the ADCs

and reference circuit. All other signal processing (e.g., multipli-

cation and filtering) is carried out in the digital domain. This

approach provides superior stability and accuracy over extremes

in environmental conditions and over time.

The ADE7751 incorporates a novel fault detection scheme that

warns of fault conditions and allows the ADE7751 to continue

accurate billing during a fault event. The ADE7751 does this

by continuously monitoring both the phase and neutral (return)

currents. A fault is indicated when these currents differ by more

than 12.5%. Billing is continued using the larger of the two currents.

The ADE7751 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 CF logic output gives instantaneous real power

information. This output is intended to be used for calibration purposes.

The ADE7751 includes a power supply monitoring circuit on the

AV DD supply pin. The ADE7751 will remain in a reset condition

until the supply voltage on AV DD reaches 4 V. If the supply falls

below 4 V, the ADE7751 will also be reset and no pulses will be

issued on F1, F2, and CF.

Internal phase matching circuitry ensures that the voltage and

current channels are matched whether the HPF in Channel 1 is

on or off. The ADE7751 also has anticreep protection.

The ADE7751 is available in 24-lead DIP and SSOP packages.

GENERAL DESCRIPTION

The ADE7751 is a high-accuracy, fault-tolerant electrical energy

measurement IC that is intended for use with 2-wire distribution

systems. The part specifications surpass the accuracy require-

ments as quoted in the IEC1036 standard.

FUNCTIONAL BLOCK DIAGRAM

G0 G1

AV DD AGND

FAULT

AC/ DC

DV DD DGND

ADE7751

V1A

POWER

SUPPLY MONITOR

... 110101 ...

ADC

PGA

A<>B

A>B

SIGNAL

PROCESSING

BLOCK

HPF

V1N

V1B

PGA

ADC

... 110101 ... B

B>A

PHASE

CORRECTION

MULTIPLIER

LPF

V2P

V2N

2.5V

ADC

... 11011001 ...

DIGITAL-TO-FREQUENCY

CONVERTER

REFERENCE

REF IN/OUT CLKIN CLKOUT SCF S0 S1 REVP CF F1 F2 RESET

* US Patent 5,745,323; 5,760,617; 5,862,069; 5,872,469.

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 that

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 www.analog.com

Fax: 781/326-8703 ? Analog Devices, Inc., 2002

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