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ADE7758 Datasheet(PDF) 1 Page - Analog Devices |
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ADE7758 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 72 page  Poly Phase Multifunction Energy Metering IC with Per Phase Information Data Sheet ADE7758 Rev. E 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 ©2004–2011 Analog Devices, Inc. All rights reserved. FEATURES Highly accurate; supports IEC 60687, IEC 61036, IEC 61268, IEC 62053-21, IEC 62053-22, and IEC 62053-23 Compatible with 3-phase/3-wire, 3-phase/4-wire, and other 3-phase services Less than 0.1% active energy error over a dynamic range of 1000 to 1 at 25°C Supplies active/reactive/apparent energy, voltage rms, current rms, and sampled waveform data Two pulse outputs, one for active power and the other selectable between reactive and apparent power with programmable frequency Digital power, phase, and rms offset calibration On-chip, user-programmable thresholds for line voltage SAG and overvoltage detections An on-chip, digital integrator enables direct interface-to- current sensors with di/dt output A PGA in the current channel allows direct interface to current transformers An SPI®-compatible serial interface with IRQ Proprietary ADCs and DSP provide high accuracy over large variations in environmental conditions and time Reference 2.4 V (drift 30 ppm/°C typical) with external overdrive capability Single 5 V supply, low power (70 mW typical) GENERAL DESCRIPTION The ADE7758 is a high accuracy, 3-phase electrical energy measurement IC with a serial interface and two pulse outputs. The ADE7758 incorporates second-order Σ-Δ ADCs, a digital integrator, reference circuitry, a temperature sensor, and all the signal processing required to perform active, reactive, and apparent energy measurement and rms calculations. The ADE7758 is suitable to measure active, reactive, and apparent energy in various 3-phase configurations, such as WYE or DELTA services, with both three and four wires. The ADE7758 provides system calibration features for each phase, that is, rms offset correction, phase calibration, and power calibration. The APCF logic output gives active power information, and the VARCF logic output provides instantaneous reactive or apparent power information. FUNCTIONAL BLOCK DIAGRAM PHASE B AND PHASE C DATA 4 AVDD POWER SUPPLY MONITOR 12 REFIN/OUT 11 AGND ADC – + 9 ICP 10 ICN PGA1 ADC – + 14 VCP 13 VN PGA2 ACTIVE/REACTIVE/AP PARENT ENERGIES AND VOLTAGE/CURRENT RMS CALCUL ATION FOR PHASE C (SEE PHASE A FOR DETAILED SIGNAL PATH) ADC – + 7 IBP 8 IBN PGA1 ADC – + 15 VBP PGA2 ACTIVE/REACTIVE/AP PARENT ENERGIES AND VOLTAGE/CURRENT RMS CALCUL ATION FOR PHASE B (SEE PHASE A FOR DETAILED SIGNAL PATH) ADC – + 5 IAP 6 IAN PGA1 ADC – + 16 VAP PGA2 AVRMSGAIN[11:0] AVAG[11:0] |X| APHCAL[6:0] Φ HPF INTEGRATOR dt AVAROS[11:0] AVARG[11:0] LPF2 90° PHASE SHIFTING FILTER π 2 AWATTOS[11:0] AWG[11:0] LPF2 22 DIN 24 DOUT 23 SCLK 21 CS 18 IRQ ADE7758 REGISTERS AND SERIAL INTERFACE WDIV[7:0] % VARDIV[7:0] % VADIV[7:0] % AIRMSOS[11:0] X2 LPF 2.4V REF 4kΩ DFC ÷ APCFNUM[11:0] APCFDEN[ 11:0] ACTIVE POWER 1 APCF 3 DVDD 2 DGND 19 CLKIN 20 CLKOUT DFC VARCFNUM[11:0] VARCFDEN[ 11:0] REACTIVE OR APPARENT POWER 17 VARCF ADE7758 AVRMSOS[11:0] ÷ Figure 1. |
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