EVAL-ADE7753ZEB【PDF 1/60 页】BOARD EVALUATION AD7753

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Single-Phase Multifunction Metering IC

with di/dt Sensor Interface

ADE7753

FEATURES

High accuracy; supports IEC 60687/61036/61268 and

IEC 62053-21/62053-22/62053-23

On-chip digital integrator enables direct interface to current

sensors with di/dt output

A PGA in the current channel allows direct interface to

shunts and current transformers

Active, reactive, and apparent energy; sampled waveform;

current and voltage rms

Less than 0.1% error in active energy measurement over a

dynamic range of 1000 to 1 at 25°C

Positive-only energy accumulation mode available

On-chip user programmable threshold for line voltage surge

and SAG and PSU supervisory

Digital calibration for power, phase, and input offset

On-chip temperature sensor (±3°C typical)

SPI? compatible serial interface

Pulse output with programmable frequency

Interrupt request pin (IRQ) and status register

Reference 2.4 V with external overdrive capability

Single 5 V supply, low power (25 mW typical)

GENERAL DESCRIPTION

The ADE7753 1 features proprietary ADCs and DSP for high

accuracy over large variations in environmental conditions and

time. The ADE7753 incorporates two second-order 16-bit ? -Δ

ADCs, a digital integrator (on CH1), reference circuitry,

temperature sensor, and all the signal processing required to

line-voltage period measurement, and rms calculation on the

voltage and current. The selectable on-chip digital integrator

provides direct interface to di/dt current sensors such as

Rogowski coils, eliminating the need for an external analog

integrator and resulting in excellent long-term stability and pre-

cise phase matching between the current and voltage channels.

The ADE7753 provides a serial interface to read data, and a

pulse output frequency (CF), which is proportional to the active

power. Various system calibration features, i.e., channel offset

correction, phase calibration, and power calibration, ensure

high accuracy. The part also detects short duration low or high

voltage variations.

The positive-only accumulation mode gives the option to

accumulate energy only when positive power is detected. An

internal no-load threshold ensures that the part does not exhibit

any creep when there is no load. The zero-crossing output (ZX)

produces a pulse that is synchronized to the zero-crossing point

of the line voltage. This signal is used internally in the line cycle

active and apparent energy accumulation modes, which enables

faster calibration.

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, an open-drain, active low logic output.

The ADE7753 is available in a 20-lead SSOP package.

perform active, reactive, and apparent energy measurements,

FUNCTIONAL BLOCK DIAGRAM

AVDD

RESET

DVDD

DGND

V1P

PGA

INTEGRATOR

MULTIPLIER

LPF2

WGAIN[11:0]

ADE7753

V1N

ADC

TEMP

SENSOR

HPF1

PHCAL[5:0]

APOS[15:0]

DFC

CFNUM[11:0]

x 2

IRMSOS[11:0]

VAGAIN[11:0]

CFDEN[11:0]

PGA

VRMSOS[11:0]

V2P

ADC

|x|

V2N

LPF1

VADIV[7:0]

WDIV[7:0]

2.4V

REFERENCE

REGISTERS AND

SERIAL INTERFACE

SAG

02875-A-001

AGND

REF IN/OUT

CLKIN CLKOUT

DIN DOUT SCLK

IRQ

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

Figure 1.

Rev. C

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.

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

Tel: 781.329.4700 www.analog.com

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