ADE7752 Datasheet, PDF (1/10 Pages) Analog Devices – Three Phase Energy Metering IC with Pulse Output

PRELIMINARY TECHNICAL DATA
=
Three Phase Energy Metering IC
with Pulse Output
Preliminary Technical Data
ADE7752*
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
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
*Patents pending
IAP 5
IAN 6
VAP 16
IBP 7
IBN 8
VBP 15
ICP
ICN 10
VCP ¹⁴
VN 13
ADC
ADC
HPF
Φ
PHASE
CORRECTION
ADC
ADC
HPF
Φ
PHASE
CORRECTION
ADC
HPF
2.5V
REF
11
AGND
ADC
4kΩ
Φ
PHASE
CORRECTION
12
REF_IN/OUT
RESET
17
VDD
3
Power
LPF
Supply
Monitor
ADE7752
Σ
LPF
2 _DGND
19 _CLKIN
20 _CLKOUT
LPF
DIGITAL-TO-FREQUENCY
CONVERTER
4
18
21
22
23
24
1
REVP SCF S0 S1 F2 F1 CF
REV. PrB 08/01
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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.
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© Analog Devices, Inc., 1999