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ADE7762ARW Arkusz danych(PDF) 1 Page - Analog Devices

Numer części ADE7762ARW
Szczegółowy opis  Polyphase Energy Metering IC with Phase Drop Indication
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Strona internetowa  http://www.analog.com
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ADE7762ARW Arkusz danych(HTML) 1 Page - Analog Devices

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Polyphase Energy Metering IC with Phase
Drop Indication
Preliminary Technical Data
ADE7762
Rev. PrB
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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
© 200
6 Analog Devices, Inc. All rights reserved.
FEATURES
High accuracy supports 50 Hz/60 Hz IEC62053-21
Less than 0.1% error over a dynamic range of 500 to 1
Compatible with 3-phase 3-wire delta and 3-phase 4-wire Wye
configurations
Supplies average active power on the frequency outputs F1 and F2
High frequency output (CF) is intended for calibration and
supplies instantaneous active power
Logic output REVP indicates a potential miswiring or negative
power on the sum of all phases
Dropout indication for each phase on LED driver pins
Phase sequence error detection
Direct drive for electromechanical counters and 2-phase stepper
motors (F1 and F2)
Proprietary ADCs and DSP provide high accuracy over large
variations in environmental conditions and time
On-chip power supply monitoring
On-chip creep protection (no load threshold)
On-chip reference 2.4 V ± 8% (25 ppm/°C typical) with external
overdrive capability
Single 5 V supply, low power (TBD mW typical)
Low cost CMOS process
GENERAL DESCRIPTION
The ADE77621 is a high accuracy polyphase electrical energy
measurement IC. The ADE7762 specifications surpass the
accuracy requirements as quoted in the IEC62053-21 standard.
The only analog circuitry used in the ADE7762 is in the
analog-to-digital converters (ADCs) and reference circuit. All
other signal processing (for example, multiplication, filtering,
and summation) is carried out in the digital domain. This
approach provides superior stability and accuracy over
extremes in environmental conditions and over time.
The ADE7762 supplies average active power information on the
low frequency outputs, F1 and F2. These logic outputs can be
used to directly drive an electromechanical counter or to inter-
face with an MCU. The CF logic output gives instantaneous
active power information. This output is intended to be used for
calibration purposes.
The ADE7762 includes a power supply monitoring circuit on the
VDD pin. The ADE7762 remains inactive until the supply voltage
on VDD reaches 4 V. If the supply falls below 4 V, the ADE7762
also resets and no pulses are issued on F1, F2, and CF.
A multiple multiplexed logic output provides phase dropout per
phase, reverse polarity per phase, and a phase sequence error.
Internal phase matching circuitry ensures that the voltage and
current channels are phase matched. An internal no load
threshold ensures the ADE7762 does not exhibit any creep
when there is no load.
The ADE7762 is available in a 28-lead SOIC package.
1 Patent pending.
FUNCTIONAL BLOCK DIAGRAM
19
5
4
21
22
3
26
25
24
23
20
6
27
28
2
1
14
13
LPF
HPF
Φ
CLKOUT
CLKIN
DGND
CF
S1
F1
F2
S0
SCF
REVP
LED_C
LED_B
LED_A
LED_CTRL
DIGITAL-TO-FREQUENCY CONVERTER
2.4V REF
REFIN/OUT
AGND
4k
Ω
IBP
IBN
VBP
VN
ICP
ICN
VCP
IAP
IAN
VAP
ADC
ADC
ADC
ADC
VDD
ADE7762
POWER
SUPPLY
MONITOR
ADC
ADC
HPF
Φ
HPF
Φ
LPF
LPF
PHASE AND REVP MONITOR
Σ
X
X
X
ABS
15
12
11
17
10
9
18
8
7
16
Figure 1.


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