PRELIMINARY TECHNICAL DATA
=
Preliminary Technical Data
FEATURES
High Accuracy, Supports 50 Hz/60 Hz IEC 687/1036
Less than 0.1% Error Over a Dynamic Range of
500 to 1
Compatible with 3-phase/3-wire and 3-phase/4-wire
configurations
The ADE7752 Supplies Average Real Power on the
Frequency Outputs F1 and F2
The High Frequency Output CF Is Intended for
Calibration and Supplies
Instantaneous Real Power
The Logic Output REVP indicates a Potential Miswiring or
Negative Power for each phase
Direct Drive for Electromechanical Counters and
Two 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 2.5 V 卤 8% (30 ppm/8C Typical)
with External Overdrive Capability
Single 5 V Supply, Low Power (15 mW Typical)
Low Cost CMOS Process
ThreePhaseEnergyMeteringIC
withPulseOutput
ADE7752*
GENERAL DESCRIPTION
The ADE7752 is a high accuracy three phase electrical
energy measurement IC. The part specifications surpass the
accuracy requirements as quoted in the IEC1036 standard.
The only analog circuitry used in the ADE7752 is in the
ADCs and reference circuit. All other signal processing (e.g.,
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 ADE7752 supplies average real power information on
the low frequency outputs F1 and F2. These logic outputs
may be used to directly drive an electromechanical counter or
interface with an MCU. The CF logic output gives instan-
taneous real power information. This output is intended to be
used for calibration purposes, or as interface with an MCU.
The ADE7752 includes a power supply monitoring circuit
on the AV
DD
supply pin. The ADE7752 will remain inactive
until the supply voltage on V
DD
reaches 4 V. If the supply falls
below 4 V, the ADE7752 will also be reset and no pulses will
be issued on F1, F2 and CF.
Internal phase matching circuitry ensures that the voltage and
current channels are phase matched. An internal no-load
threshold ensures that the ADE7752 does not exhibit any
creep when there is no load.
The ADE7752 is available in 24-lead SOIC packages.
FUNCTIONAL BLOCK DIAGRAM
RESET
17
VDD
3
IAP
5
IAN
6
VAP
16
ADC
ADC
HPF
LPF
桅
PHASE
CORRECTION
Power
Supply
Monitor
ADE7752
LPF
IBP
7
IBN
8
VBP
15
ADC
ADC
HPF
危
2
19
20
桅
PHASE
CORRECTION
DGND
CLKIN
CLKOUT
ICP
ICN
10
VCP
14
VN
13
2.5V
REF
11
ADC
ADC
HPF
LPF
桅
PHASE
CORRECTION
4k鈩?/div>
12
DIGITAL-TO-FREQUENCY
CONVERTER
4
18
21
22
23
24
1
*Patents pending
AGND
REF
IN/OUT
REVP SCF S0
S1
F2 F1
CF
REV. PrB 08/01
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
漏 Analog Devices, Inc., 1999
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