REV. PrB 08/01
Preliminary Technical Data
PRELIMINARY TECHNICAL DATA
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.
G61
ADE7752*
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 © Analog Devices, Inc., 1999
Three Phase Energy Metering IC
with Pulse Output
FUNCTIONAL BLOCK DIAGRAM
CLKOUT
CLKIN
DGND
CFS1 F1F2
DIGITAL-TO-FREQUENCY
CONVERTER
2.5V
REF
REF
IN/OUT
AGND
4kΩ
Σ
IBP
IBN
ADC
VBP
ADC
VN
ICP
ICN
ADC
VCP
ADC
VDD
RESET
ADE7752
Power
Supply
Monitor
HPF
Φ
LPF
IAP
IAN
ADC
VAP
ADC
PHASE
CORRECTION
HPF
Φ
LPF
PHASE
CORRECTION
HPF
Φ
LPF
PHASE
CORRECTION
S0SCFREVP
7
8
15
10
14
13
5
6
16
11 12 4 18 21 22 23 24 1
20
19
2
17 3
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 ± 8% (30 ppm/8C Typical)
with External Overdrive Capability
Single 5 V Supply, Low Power (15 mW Typical)
Low Cost CMOS Process
*Patents pending
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.