ADE7758 datasheet(1/68 Pages) AD

部件名	ADE7758

功能描述	Poly Phase Multifunction Energy Metering IC with Per Phase Information

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制造商	AD [Analog Devices]

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Poly Phase Multifunction Energy Metering IC

with Per Phase Information

ADE7758

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.

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

FEATURES

High accuracy, supports IEC 60687, IEC 61036, IEC 61268,

IEC 62053-21, IEC 62053-22, and IEC 62053-23

Compatible with 3-phase/3-wire, 3-phase/4-wire, and other

3-phase services

Less than 0.1% active energy error over a dynamic range of

1000 to 1 at 25°C

Supplies active/reactive/apparent energy, voltage rms,

current rms, and sampled waveform data

Two pulse outputs, one for active power and the other

selectable between reactive and apparent power with

programmable frequency

Digital power, phase, and rms offset calibration

On-chip user programmable thresholds for line voltage SAG

and overvoltage detections

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

A SPI® compatible serial interface with IRQ

Proprietary ADCs and DSP provide high accuracy over large

variations in environmental conditions and time

Reference 2.4 V (drift 30 ppm/°C typ) with external

overdrive capability

Single 5 V supply, low power (70 mW typ)

GENERAL DESCRIPTION

The ADE77581 is a high accuracy 3-phase electrical energy

measurement IC with a serial interface and two pulse outputs.

The ADE7758 incorporates second-order ∑-∆ ADCs, a digital

integrator, reference circuitry, temperature sensor, and all the

signal processing required to perform active, reactive, and

apparent energy measurement and rms calculations.

The ADE7758 is suitable to measure active, reactive, and

apparent energy in various 3-phase configurations, such as

WYE or DELTA services, both with three or four wires. The

ADE7758 provides system calibration features for each phase,

i.e., rms offset correction, phase calibration, and power

calibration. The APCF logic output gives active power

information, and the VARCF logic output provides

instantaneous reactive or apparent power information.

(Continued on Page 4)

FUNCTIONAL BLOCK DIAGRAM

PHASE B

AND

PHASE C

DATA

4

AVDD

POWER

SUPPLY

MONITOR

12

REFIN/OUT

11

AGND

ADC

–

+

9

ICP

10

ICN

PGA1

ADC

–

+

14

VCP

13

VN

PGA2

ACTIVE/REACTIVE/APPARENT ENERGIES

AND VOLTAGE/CURRENT RMS CALCULATION

FOR PHASE C

(SEE PHASE A FOR DETAILED SIGNAL PATH)

ADC

–

+

7

IBP

8

IBN

PGA1

ADC

–

+

15

VBP

PGA2

ACTIVE/REACTIVE/APPARENT ENERGIES

AND VOLTAGE/CURRENT RMS CALCULATION

FOR PHASE B

(SEE PHASE A FOR DETAILED SIGNAL PATH)

ADC

–

+

5

IAP

6

IAN

PGA1

ADC

–

+

16

VAP

PGA2

AIGAIN[11:0]

AVRMSGAIN[11:0]

AVAG[11:0]

X2

APHCAL[6:0]

Φ

HPF

INTEGRATOR

dt

AVAROS[11:0]

AVARG[11:0]

LPF2

90

° PHASE

SHIFTING FILTER

π

2

AWATTOS[11:0]

AWG[11:0]

LPF2

22

DIN

24

DOUT

23

SCLK

21

CS

18

IRQ

ADE7758 REGISTERS AND

SERIAL INTERFACE

WDIV[7:0]

%

VARDIV[7:0]

%

VADIV[7:0]

%

AIRMSOS[11:0]

X2

LPF

2.4V

REF

4k

Ω

DFC

÷

APCFNUM[11:0]

APCFDEN[11:0]

ACTIVE POWER

1

APCF

3

DVDD

2

DGND

19

CLKIN

20

CLKOUT

DFC

VARCFNUM[11:0]

VARCFDEN[11:0]

REACTIVE OR

APPARENT POWER

17

VARCF

ADE7758

÷

AVRMSOS[11:0]

1 Patents Pending.

Figure 1.

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