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ADE7755ARSRL

Energy Metering IC with Pulse Output

Analog Devices 

PRELIMINARY TECHNICAL DATA

a

Energy Metering IC

with Pulse Output

Preliminary Technical Data

ADE7755*

FEATURES

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

Less than 0.1% Error over a Dynamic Range of

500 to 1

The ADE7755 Supplies Average Real Power on the

Frequency Outputs F1 and F2

The High-Frequency Output CF Is Intended for

Calibration and Supplies Instantaneous Real Power

Pin Compatible with AD7755 with Synchronous CF and

F1/F2 Outputs

The Logic Output REVP Can Be Used to Indicate a

Potential Miswiring or Negative Power

Direct Drive for Electromechanical Counters and

Two 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

GENERAL DESCRIPTION

The ADE7755 is pin compatible with the AD7755. The only

difference between the ADE7755 and the AD7755 is that the

ADE7755 features a synchronous CF and F1/F2 outputs under

all load conditions.

The ADE7755 is a high accuracy electrical energy measurement

IC. The part specifications surpass the accuracy requirements as

quoted in the IEC1036 standard. See Analog Devices’ Appli-

cation Note AN-559 for a description of an IEC1036 watt-hour

meter reference design based on the AD7755.

The only analog circuitry used in the ADE7755 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 ADE7755 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 or for interfacing to an MCU.

The ADE7755 includes a power supply monitoring circuit on the

AVDD supply pin. The ADE7755 will remain in a reset condition

until the supply voltage on AVDD reaches 4 V. If the supply falls

below 4 V, the ADE7755 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 phase matched whether the HPF in Chan-

nel 1 is on or off. An internal no-load threshold ensures that the

ADE7755 does not exhibit any creep when there is no load.

The ADE7755 is available in a 24-lead SSOP package.

G0 G1

FUNCTIONAL BLOCK DIAGRAM

AVDD AGND

AC/DC

DVDD DGND

ADE7755

POWER

SUPPLY MONITOR

PHASE

CORRECTION

V1P

. . .110101. . .

ADC

⌽

V1N

PGA

؋1, ؋2, ؋8, ؋16

HPF

MULTIPLIER

SIGNAL

PROCESSING

BLOCK

LPF

V2P

. . .11011001. . .

ADC

V2N

2.5V

4k⍀

REFERENCE

DIGITAL-TO-FREQUENCY

CONVERTER

RESET

REFIN/OUT CLKIN CLKOUT SCF S0 S1 REVP CF F1 F2

*U.S. Patents 5,745,323, 5,760,617, 5,862,069, and 5,872,469.

REV. PrA

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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