ADE7768AR-REF AD [Analog Devices], ADE7768AR-REF Datasheet

ADE7768AR-REF

Manufacturer Part Number

ADE7768AR-REF

Description

Energy Metering IC with Integrated Oscillator and Positive Power Accumulation

Manufacturer

AD [Analog Devices]

Datasheet

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FEATURES

On-chip oscillator as clock source

High accuracy, supports 50 Hz/60 Hz IEC62053-21

Less than 0.1% error over a dynamic range of 500 to 1

Supplies positive-only average real power on frequency

High frequency output CF calibrates and supplies

Logic output REVP indicates potential miswiring or negative

Direct drive for electromechanical counters and 2-phase

Proprietary ADCs and DSPs provide high accuracy over

On-chip power supply monitoring

On-chip creep protection (no-load threshold)

On-chip reference 2.45 V (20 ppm/°C typical) with

Single 5 V supply, low power (20 mW typical)

Low cost CMOS process

GENERAL DESCRIPTION

The ADE7768

It is a pin reduction version of the ADE7755, enhanced with a

precise oscillator circuit that serves as a clock source to the chip.

The ADE7768 eliminates the cost of an external crystal or

resonator, thus reducing the overall cost of a meter built with

this IC. The chip directly interfaces with the shunt resistor.

Rev. A

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.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

U.S. Patents 5,745,323; 5,760,617; 5,862,069; 5,872,469; others pending.

outputs F1 and F2

instantaneous, positive-only real power

power

stepper motors (F1 and F2)

large variations in environmental conditions and time

external overdrive capability

is a high accuracy, electrical energy metering IC.

V2P

V2N

V1N

V1P

REFERENCE

2.5V

Oscillator and Positive Power Accumulation

FUNCTIONAL BLOCK DIAGRAM

SUPPLY MONITOR

4kΩ

REF

POWER

ADC

Σ-Δ

IN/OUT

...110101...

...11011001...

AGND

OSCILLATOR

INTERNAL

RCLKIN

Figure 1.

Energy Metering IC with Integrated

CORRECTION

PHASE

SCF

The ADE7768 specifications surpass the accuracy require-

ments of the IEC62053-21 standard. The

Note

(equivalent to IEC62053-21) low cost, watt-hour meter

reference design.

The only analog circuitry used in the ADE7768 is in the Σ-Δ

ADCs and reference circuit. All other signal processing, such as

multiplication and filtering, is carried out in the digital domain.

This approach provides superior stability and accuracy over

time and extreme environmental conditions.

The ADE7768 supplies positive-only average real power

information on the low frequency outputs, F1 and F2. These

outputs can be used to directly drive an electromechanical

counter or interface with an MCU. The high frequency CF logic

output, ideal for calibration purposes, provides instantaneous

positive-only, real power information.

The ADE7768 includes a power supply monitoring circuit on

the V

supply voltage on V

falls below 4 V, the ADE7768 also remains inactive and the F1,

F2, and CF outputs are in their nonactive modes.

Internal phase matching circuitry ensures that the voltage and

current channels are phase matched, while the HPF in the

current channel eliminates dc offsets. An internal no-load

threshold ensures that the ADE7768 does not exhibit creep

when no load is present. When REVP is logic high, the

ADE7768 does not generate any pulse on F1, F2, and CF.

The ADE7768 comes in a 16-lead, narrow body SOIC package.

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

Tel: 781.329.4700

Fax: 781.461.3113

MULTIPLIER

DIGITAL-TO-FREQUENCY

HPF

can be used as a basis for a description of an IEC61036

ADE7768

CONVERTER

supply pin. The ADE7768 remains inactive until the

REVP

DGND

PROCESSING

LPF

SIGNAL

BLOCK

reaches approximately 4 V. If the supply

AN-679 Application

ADE7768

www.analog.com

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