ANALOG DEVICES Energy Metering IC with Pulse Output ADE7755 Product Data Sheet Manual User Guide

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Energy Metering IC with Pulse Output ADE7755*

FEATURES The ADE7755 is a high accuracy electrical energy measurement High Accuracy, Surpasses 50 Hz/60 Hz IEC 687/1036 IC. The part specifications surpass the accuracy requirements as Less than 0.1% Error over a Dynamic Range of quoted in the IEC1036 standard. See Analog Devices’ Appli- 500 to 1 cation Note AN-559 for a description of an IEC1036 watt-hour The ADE7755 Supplies Average Real Power on the meter reference design based on the AD7755.

Frequency Outputs F1 and F2

The only analog circuitry used in the ADE7755 is in the ADCs

The High-Frequency Output CF Is Intended for

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

Calibration and Supplies Instantaneous Real Power

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

Pin Compatible with AD7755 with Synchronous CF and

approach provides superior stability and accuracy over extremes

F1/F2 Outputs

in environmental conditions and over time.

The Logic Output REVP Can Be Used to Indicate a

The ADE7755 supplies average real power information on the

Potential Miswiring or Negative Power

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

Direct Drive for Electromechanical Counters and

used to directly drive an electromechanical counter or interface

Two Phase Stepper Motors (F1 and F2)

to an MCU. The CF logic output gives instantaneous real power

A PGA in the Current Channel Allows the Use of Small

information. This output is intended to be used for calibration

Values of Shunt and Burden Resistance

purposes or for interfacing to an MCU.

Proprietary ADCs and DSP Provide High Accuracy over Large Variations in Environmental Conditions and The ADE7755 includes a power supply monitoring circuit on the Time AVDD supply pin. The ADE7755 will remain in a reset condition On-Chip Power Supply Monitoring until the supply voltage on AVDD reaches 4 V. If the supply falls On-Chip Creep Protection (No Load Threshold) below 4 V, the ADE7755 will also be reset and no pulses will be On-Chip Reference 2.5 V  8% (30 ppm/C Typical) issued on F1, F2, and CF. with External Overdrive Capability

Internal phase matching circuitry ensures that the voltage and

Single 5 V Supply, Low Power (15 m W Typical)

current channels are phase matched whether the HPF in Chan-

Low Cost CMOS Process

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.

GENERAL DESCRIPTION

The ADE7755 is pin compatible with the AD7755. The only The ADE7755 is available in a 24-lead SSOP package.

difference between the ADE7755 and the AD7755 is that the ADE7755 features a synchronous CF and F1/F2 outputs under all load conditions.

FUNCTIONAL BLOCK DIAGRAM G0 G1 AVDD AGND AC/DC DVDD DGND

ADE7755

POWER SUPPLY MONITOR

PHASE SIGNAL CORRECTION PROCESSING

V1P ...110101... BLOCK

HPF LPF

MULTIPLIER

DIGITAL-TO-FREQUENCY

RESET

CONVERTER

2.5V REFERENCE

CLKINREFIN/OUT CLKOUT S0 S1 F1 F2CFREVPSCF

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

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