Datasheet ADE7752, ADE7752A (Analog Devices)

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Polyphase Energy Metering IC with Pulse Output ADE7752/ADE7752A FEATURES
ADE7752A are the same. Both products are referred to in the
High accuracy, supports 50 Hz/60 Hz IEC62053-2x
text of this data sheet as ADE7752.
Less than 0.1% error over a dynamic range of 500 to 1
The part specifications surpass the accuracy requirements as
Compatible with 3-phase/3-wire delta and 3-phase/4-wire
quoted in the IEC62053-2x standard. The only analog circuitry
Wye configurations
used in the ADE7752 is in the analog-to-digital converters (ADCs)
The ADE7752 sup plies average real power on frequency
and reference circuit. All other signal processing (such as multi-
outputs F1 and F2
plication, filtering, and summation) is carried out in the digital
High frequency output CF is intended for calibration and
domain. This approach provides superior stability and accuracy
supplies instantaneous real power Logic output REVP indicates a potential miswiring or
over extremes in environmental conditions and over time.
negative power for each phase
The ADE7752 supplies average real power information on the
Direct drive for electromechanical counters and 2-phase
low frequency outputs, F1 and F2. These logic outputs may be
stepper motors (F1 and F2)
used to directly drive an electromechanical counter or to
Proprietary ADCs and DSP provide high accuracy over large
interface with an MCU. The CF logic output gives instanta-
variations in environmental conditions and time On-chip power supply monitoring
neous real power information. This output is intended to be
On-chip creep protection (no load threshold)
used for calibration purposes.
On-chip reference 2.4 V ±8% (20 ppm/°C typical) with
The ADE7752 includes a power supply monitoring circuit on
external overdrive capability
the VDD pin. The ADE7752 remains inactive until the supply
Single 5 V supply, low power
voltage on VDD reaches 4 V. If the supply falls below 4 V, no
60 mW typical: ADE7752
pulses are issued on F1, F2, and CF. Internal phase matching
30 mW typical: ADE7752A Low cost CMOS process
circuitry ensures that the voltage and current channels are phase matched. An internal no load threshold ensures the part
GENERAL DESCRIPTION
does not exhibit any creep when there is no load. The ADE7752 is available in a 24-lead SOIC package. The ADE7752 is a high accuracy polyphase electrical energy measurement IC. The ADE7752A is a pin-to-pin compatible low power version of ADE7752. The functions of ADE7752 and
FUNCTIONAL BLOCK DIAGRAM V ABS DD 17 3 IAP 5 ADC X POWER IAN 6 HPF LPF SUPPLY VAP 16 MONITOR ADC
Φ
PHASE ADE7752/ CORRECTION ADE7752A IBP 7 ADC X
Σ
IBN 8 HPF 2 DGND LPF 15 VBP ADC
Φ
19 CLKIN PHASE CORRECTION 20 CLKOUT ICP 9 ADC X ICN 10 HPF LPF VCP 14 ADC
Φ
VN 13 DIGITAL-TO-FREQUENCY CONVERTER PHASE 4k
Ω
CORRECTION 2.4V REF
01 -0 A
11 12 4 18 21 22 23 24 1
6- 67
AGND REFIN/OUT REVP SCF S0 S1 F2 F1 CF
02 Figure 1. 24-Lead Standard Small Outline Package [SOIC]
Rev. C 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. 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 Tel: 781.329.4700 www.analog.com Devices. Trademarks and registered trademarks are the property of their respective owners. Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved.
Document Outline FEATURES GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM SPECIFICATIONS TIMING CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TEST CIRCUIT TERMINOLOGY THEORY OF OPERATION POWER FACTOR CONSIDERATIONS NONSINUSOIDAL VOLTAGE AND CURRENT ANALOG INPUTS CURRENT CHANNELS VOLTAGE CHANNELS TYPICAL CONNECTION DIAGRAMS CURRENT CHANNEL CONNECTION VOLTAGE CHANNELS CONNECTION METER CONNECTIONS POWER SUPPLY MONITOR HPF AND OFFSET EFFECTS DIGITAL-TO-FREQUENCY CONVERSION MODE SELECTION OF THE SUM OF THE THREE ACTIVE ENERGIES POWER MEASUREMENT CONSIDERATIONS TRANSFER FUNCTION FREQUENCY OUTPUTS F1 AND F2 FREQUENCY OUTPUT CF SELECTING A FREQUENCY FOR AN ENERGY METER APPLICATION FREQUENCY OUTPUTS NO LOAD THRESHOLD NEGATIVE POWER INFORMATION OUTLINE DIMENSIONS ORDERING GUIDE