ADE7759 datasheet(1/32 Pages) AD

部件名	ADE7759

功能描述	Active Energy Metering IC with di/dt Sensor Interface

PDF	32 Pages

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制造商	AD [Analog Devices]

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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.

a

ADE7759*

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

Active Energy Metering IC with

di/dt Sensor Interface

FUNCTIONAL BLOCK DIAGRAM

AVDD

RESET

DVDD

DGND

ZX

SAG

CF

V1P

V1N

V2N

V2P

TEMP

SENSOR

ADC

DFC

ADE7759

APOS[15:0]

LPF2

MULTIPLIER

INTEGRATOR

MULTIPLIER

CLKIN CLKOUT

DIN DOUT SCLK

REFIN/OUT

CS

IRQ

AGND

APGAIN[11:0]

dt

REGISTERS AND

SERIAL INTERFACE

CFNUM[11:0]

CFDEN[11:0]

2.4V

REFERENCE

4k

PHCAL[7:0]

HPF1

LPF1

FEATURES

High Accuracy, Supports IEC 687/1036

On-Chip Digital Integrator Allows Direct Interface with

Current Sensors with di/dt Output Such as Rogowski Coil

Less Than 0.1% Error over a Dynamic Range of 1000 to 1

On-Chip User-Programmable Threshold for Line Voltage

SAG Detection and PSU Supervisory

The ADE7759 Supplies Sampled Waveform Data and

Active Energy (40 Bits)

Digital Power, Phase and Input DC Offset Calibration

On-Chip Temperature Sensor (Typical 1 LSB/ C Resolution)

SPI-Compatible Serial Interface

Pulse Output with Programmable Frequency

Interrupt Request Pin (IRQ) and IRQ Status Register

Proprietary ADCs and DSP provide High Accuracy over

Large Variations in Environmental Conditions and Time

Reference 2.4 V

8% (20 ppm/ C Typical) with External

Overdrive Capability

Single 5 V Supply, Low Power Consumption (25 mW

Typical)

GENERAL DESCRIPTION

The ADE7759 is an accurate active power and energy measurement

IC with a serial interface and a pulse output. The ADE7759 incor-

porates two second order

Σ-∆ ADCs, a digital integrator (on CH1),

reference circuitry, temperature sensor, and all the signal processing

required to perform active power and energy measurement.

An on-chip digital integrator allows direct interface to di/dt

current sensors such as a Rogowski coil. The digital integrator

eliminates the need for an external analog integrator and pro-

vides excellent long-term stability and precise phase matching

between the current and the voltage channels. The integrator

can be switched off if the ADE7759 is used with conventional

current sensors.

The ADE7759 contains a sampled Waveform register and an Active

Energy register capable of holding at least 11.53 seconds of accumu-

lated power at full ac load. Data is read from the ADE7759 via the

serial interface. The ADE7759 also provides a pulse output (CF)

with frequency that is proportional to the active power.

In addition to active power information, the ADE7759 also

provides various system calibration features, i.e., channel offset

correction, phase calibration, and power offset correction. The

part also incorporates a detection circuit for short duration

voltage drop (SAG). The voltage threshold and the duration (in

number of half-line cycles) of the drop are user programmable.

An open drain logic output (

SAG) goes active low when a sag

event occurs.

A zero crossing output (ZX) produces an output that is synchro-

nized to the zero crossing point of the line voltage. This output

can be used to extract timing or frequency information from the

line. The signal is also used internally to the chip in the line

cycle energy accumulation mode; i.e., the number of half-line

cycles in which the energy accumulation occurs can be con-

trolled. Line cycle energy accumulation enables a faster and

more precise energy accumulation and is especially useful dur-

ing calibration. This signal is also useful for synchronization of

relay switching with a voltage zero crossing.

The interrupt request output is an open drain, active low logic

output. The Interrupt Status Register indicates the nature of the

interrupt, and the Interrupt Enable Register controls which

event produces an output on the

IRQ pin. The ADE7759 is

available in a 20-lead SSOP package.

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

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