ADE7752B_15 Datasheet, PDF (1/24 Pages) Analog Devices – 3-Phase, 3-Wire, and 4-Wire Energy Metering IC with Pulse Output

3-Phase, 3-Wire, and 4-Wire
Energy Metering IC with Pulse Output
ADE7752B
FEATURES
High accuracy supports 50 Hz/60 Hz IEC 62053-21
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
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 (42.5 mW typical)
Low cost CMOS process
GENERAL DESCRIPTION
The ADE7752B is a high accuracy polyphase electrical energy
measurement IC. The ADE7752B specifications surpass the
accuracy requirements as quoted in the IEC62053-21 standard.
The only analog circuitry used in the ADE7752B 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 ADE7752B 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
interface with a microcontroller (MCU). The CF logic output
gives instantaneous active power information. This output is
intended to be used for calibration purposes.
The ADE7752B includes a power supply monitoring circuit on
the VDD pin. The ADE7752B remains inactive until the supply
voltage on VDD reaches 4 V. If the supply falls below 4 V, the
ADE7752B resets and no pulses are 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 ADE7752B does not exhibit any
creep when there is no load.
The ADE7752B is available in a 24-lead SOIC package.
FUNCTIONAL BLOCK DIAGRAM
ABS
17
V_DD
3
IAP 5
IAN 6
VAP 16
IBP 7
IBN 8
VBP 15
ADC
ADC
ADC
ADC
ICP 9
ICN 10
VCP 14
VN 13
2.4V REF
ADC
ADC
4kΩ
HPF
Ф
HPF
Ф
HPF
Ф
LPF
X
X
LPF
X
LPF
POWER
SUPPLY
MONITOR
ADE7752B
2 DGND
19 _CLKIN
20 CLKOUT
DIGITAL-TO-FREQUENCY CONVERTER
11
AGND
12
REF_IN/OUT
4
18
22
21
23
24
1
REVP SCF S1 S0 F2 F1 CF
Figure 1.
Rev. 0
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: [phone]
www.analog.com
Fax: [phone]
©2007 Analog Devices, Inc. All rights reserved.