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ADE7752BARWZ Datasheet(PDF) 1 Page - Analog Devices |
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ADE7752BARWZ Datasheet(HTML) 1 Page - Analog Devices |
1 / 27 page Polyphase Energy Metering IC with Pulsed Output Preliminary Technical Data ADE7752B Rev. PrA Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 © 2006 Analog Devices, Inc. All rights reserved. FEATURES High accuracy supports 50 Hz/60 Hz IEC62053-21 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) based on the sum of the three phases On-chip reference 2.4 V ± 8% (25 ppm/°C typical) with external overdrive capability Single 5 V supply, low power (TBD mW typical) Low cost CMOS process GENERAL DESCRIPTION The ADE7752B1 is an accurate active energy measurement IC intended for use in any 3-phase distribution system and has enhanced features that make it better suited for 3-phase 3-wire applications compared to the ADE7752/52A. The no-load threshold and reverse polarity indication are based on the sum of the three phase energies in the ADE7752B. 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 an 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 also 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 the ADE7752B does not exhibit any creep when there is no load. The ADE7752B is available in a 24-lead SOIC package. 1 Patent pending. FUNCTIONAL BLOCK DIAGRAM 7 8 15 10 14 13 5 6 16 9 LPF HPF Φ 3 CLKOUT CLKIN DGND CF S1 F1 F2 S0 SCF REVP DIGITAL-TO-FREQUENCY CONVERTER 2.4V REF REFIN/OUT AGND 4k Ω IBP IBN VBP VN ICP ICN VCP IAP IAN VAP ADC ADC ADC ADC VDD ADE7752B POWER SUPPLY MONITOR ADC ADC PHASE CORRECTION PHASE CORRECTION PHASE CORRECTION 11 12 4 18 21 22 23 24 1 20 19 2 17 HPF Φ HPF Φ LPF LPF ABS Σ X X X Figure 1. |
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