ad71056 Analog Devices, Inc., ad71056 Datasheet

ad71056

Manufacturer Part Number

ad71056

Description

Energy Metering Ic With Integrated Oscillator And Reverse Polarity Indication

Manufacturer

Analog Devices, Inc.

Datasheet

1.AD71056.pdf (20 pages)

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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 average real power on frequency outputs (F1, F2)

High frequency output (CF) calibrates and supplies

Logic output (REVP) indicates potential miswiring or

Direct drive for electromechanical counters and 2-phase

Proprietary ADCs and DSP provide high accuracy over large

On-chip power supply monitoring

On-chip creep protection (no load threshold)

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

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

Low cost CMOS process

GENERAL DESCRIPTION

The AD71056

with a precise oscillator circuit that serves as a clock source to

the chip. The AD71056 eliminates the need for an external

crystal or resonator, thus reducing the overall cost of building a

meter 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.

instantaneous real power

negative power

stepper motors (F1, F2)

variations in environmental conditions and time

overdrive capability

is a high accuracy, electrical energy metering IC

V2N

V1N

V2P

V1P

REFERENCE

2.5V

SUPPLY MONITOR

Oscillator and Reverse Polarity Indication

4kŸ

REF

FUNCTIONAL BLOCK DIAGRAM

POWER

ADC

-û

IN/OUT

...110101...

...11011001...

AGND

OSCILLATOR

INTERNAL

RCLKIN

Energy Metering IC with Integrated

Figure 1.

CORRECTION

PHASE

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

Tel: 781.329.4700

Fax: 781.461.3113

The AD71056 specifications surpass the accuracy requirements

as quoted in the IEC62053-21 standard.

The only analog circuitry used in the AD71056 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 in extreme environmental conditions.

The AD71056 supplies average real power information on F1

and F2, the low frequency outputs. These outputs either directly

drive an electromechanical counter or interface with an MCU.

The high frequency CF logic output, ideal for calibration

purposes, provides instantaneous real power information.

The AD71056 includes a power supply monitoring circuit on

the V

supply voltage on V

falls below 4 V, the AD71056 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, and the HPF in the current

channel eliminates dc offsets. An internal no load threshold

ensures that the AD71056 does not exhibit creep when no load

is present.

The part is available in a 16-lead, narrow body SOIC package.

SCF

MULTIPLIER

DIGITAL-TO-FREQUENCY

HPF

AD71056

supply pin. The AD71056 remains inactive until the

CONVERTER

REVP

DGND

PROCESSING

LPF

reaches approximately 4 V. If the supply

SIGNAL

BLOCK

AD71056

www.analog.com

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