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ADE7758ARW View Datasheet(PDF) - Analog Devices

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ADE7758ARW Datasheet PDF : 72 Pages
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Data Sheet
Poly Phase Multifunction Energy Metering
IC with Per Phase Information
ADE7758
FEATURES
Highly accurate; 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
An on-chip, digital integrator enables direct interface-to-
current sensors with di/dt output
A PGA in the current channel allows direct interface to
current transformers
An 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 typical) with external
overdrive capability
Single 5 V supply, low power (70 mW typical)
GENERAL DESCRIPTION
The ADE7758 is a high accuracy, 3-phase electrical energy
measurement IC with a serial interface and two pulse outputs.
The ADE7758 incorporates second-order Σ-Δ ADCs, a digital
integrator, reference circuitry, a 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, with both three and four wires. The
ADE7758 provides system calibration features for each phase,
that is, 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.
AVDD
4
POWER
SUPPLY
MONITOR
REFIN/OUT
12
AGND
11
FUNCTIONAL BLOCK DIAGRAM
|X|
AVRMSGAIN[11:0]
AVRMSOS[11:0]
AVAG[11:0]
ADE7758
IAP 5
IAN 6
VAP 16
IBP 7
IBN 8
VBP 15
ICP 9
ICN 10
VCP 14
VN 13
2.4V
REF
PGA1
+
4k
ADC
PGA2
+
ADC
PGA1
+
PGA1
+
ADC
PGA2
+
ADC
ADC
PGA2
+
ADC
X2
90° PHASE
SHIFTING FILTER
π
dt
2
HPF INTEGRATOR
LPF
AIRMSOS[11:0]
LPF2
AVAROS[11:0]
AVARG[11:0]
REACTIVE OR
APPARENT POWER
VARCFNUM[ 11:0]
DFC ÷
17 VARCF
VARCFDEN[ 11:0]
Φ
APHCAL[6:0]
LPF2
AWATTOS[11:0] AWG[11:0]
PHASE B
AND
PHASE C
DATA
ACTIVE/REACTIVE/AP PARENT ENERGIES
AND VOLTAGE/CURRENT RMS CALCUL ATION
FOR PHASE B
(SEE PHASE A FOR DETAILED SIGNAL PATH)
ACTIVE/REACTIVE/AP PARENT ENERGIES
AND VOLTAGE/CURRENT RMS CALCUL ATION
FOR PHASE C
(SEE PHASE A FOR DETAILED SIGNAL PATH)
VADIV[7:0]
VARDIV[7:0]
WDIV[7:0]
%
%
%
ADE7758 REGISTERS AND
SERIAL INTERFACE
ACTIVE POWER
APCFNUM[ 11:0]
DFC ÷
APCFDEN[ 11:0]
Figure 1.
22
24
23
21
18
DIN DOUT SCLK CS IRQ
1 APCF
3 DVDD
2 DGND
19 CLKIN
20 CLKOUT
Rev. E
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: 781.461.3113 ©2004–2011 Analog Devices, Inc. All rights reserved.
 

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