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ADE7751ARS Dataheets PDF



Part Number ADE7751ARS
Manufacturers Analog Devices
Logo Analog Devices
Description Energy Metering
Datasheet ADE7751ARS DatasheetADE7751ARS Datasheet (PDF)

a FEATURES High Accuracy, Surpasses 50 Hz/60 Hz IEC 687/1036 Less than 0.1% Error over a Dynamic Range of 500 to 1 Supplies Average Real Power on the Frequency Outputs F1 and F2 High-Frequency Output CF Is Intended for Calibration and Supplies Instantaneous Real Power Continuous Monitoring of the Phase and Neutral Current Allows Fault Detection in 2-Wire Distribution Systems ADE7751 Uses the Larger of the Two Currents (Phase or Neutral) to Bill—Even During a Fault Condition Two Logic Outputs (FA.

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a FEATURES High Accuracy, Surpasses 50 Hz/60 Hz IEC 687/1036 Less than 0.1% Error over a Dynamic Range of 500 to 1 Supplies Average Real Power on the Frequency Outputs F1 and F2 High-Frequency Output CF Is Intended for Calibration and Supplies Instantaneous Real Power Continuous Monitoring of the Phase and Neutral Current Allows Fault Detection in 2-Wire Distribution Systems ADE7751 Uses the Larger of the Two Currents (Phase or Neutral) to Bill—Even During a Fault Condition Two Logic Outputs (FAULT and REVP) Can Be Used to Indicate a Potential Miswiring or Fault Condition Direct Drive for Electromechanical Counters and 2-Phase Stepper Motors (F1 and F2) A PGA in the Current Channel Allows the Use of Small Values of Shunt and Burden Resistance 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/؇ C Typical) with External Overdrive Capability Single 5 V Supply, Low Power (15 mW Typical) Low-Cost CMOS Process GENERAL DESCRIPTION Energy Metering IC with On-Chip Fault Detection ADE7751* The only analog circuitry used in the ADE7751 is in the ADCs and reference circuit. All other signal processing (e.g., multiplication and filtering) is carried out in the digital domain. This approach provides superior stability and accuracy over extremes in environmental conditions and over time. The ADE7751 incorporates a novel fault detection scheme that warns of fault conditions and allows the ADE7751 to continue accurate billing during a fault event. The ADE7751 does this by continuously monitoring both the phase and neutral (return) currents. A fault is indicated when these currents differ by more than 12.5%. Billing is continued using the larger of the two currents. The ADE7751 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 to an MCU. The CF logic output gives instantaneous real power information. This output is intended to be used for calibration purposes. The ADE7751 includes a power supply monitoring circuit on the AVDD supply pin. The ADE7751 will remain in a reset condition until the supply voltage on AVDD reaches 4 V. If the supply falls below 4 V, the ADE7751 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 matched whether the HPF in Channel 1 is on or off. The ADE7751 also has anticreep protection. The ADE7751 is available in 24-lead DIP and SSOP packages. The ADE7751 is a high-accuracy, fault-tolerant electrical energy measurement IC that is intended for use with 2-wire distribution systems. The part specifications surpass the accuracy requirements as quoted in the IEC1036 standard. FUNCTIONAL BLOCK DIAGRAM G0 G1 AVDD AGND FAULT AC/DC DVDD DGND ADE7751 POWER SUPPLY MONITOR V1A V1N V1B ADC PGA ؋1, ؋2, ؋8, ؋16 ADC PGA ؋1, ؋2, ؋8, ؋16 ADC 4k⍀ 2.5V REFERENCE A<>B A A>B SIGNAL PROCESSING BLOCK HPF ...110101... ⌽ PHASE CORRECTION MULTIPLIER LPF ...110101... B B>A V2P V2N ...11011001... DIGITAL-TO-FREQUENCY CONVERTER REFIN/OUT CLKIN CLKOUT SCF S0 S1 REVP CF F1 F2 RESET *US Patent 5,745,323; 5,760,617; 5,862,069; 5,872,469. 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. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2002 ADE7751–SPECIFICATIONS Parameter ACCURACY3 Measurement Error1 on Channels 1 and 2 Gain = 1 Gain = 2 Gain = 8 Gain = 16 Phase Error1 between Channels V1 Phase Lead 37° (PF = 0.8 Capacitive) V1 Phase Lag 60° (PF = 0.5 Inductive) AC Power Supply Rejection1 Output Frequency Variation (CF) DC Power Supply Rejection1 Output Frequency Variation (CF) FAULT DETECTION1, 4 Fault Detection Threshold Inactive i/p <> Active i/p Input Swap Threshold Inactive i/p > Active i/p Accuracy Fault Mode Operation V1A Active, V1B = AGND V1B Active, V1A = AGND Fault Detection Delay Swap Delay Value 0.1 0.1 0.1 0.1 1, 2 (AVDD = DVDD = 5 V ؎ 5%, AGND = DGND = 0 V, On-Chip Reference, CLKIN = 3.58 MHz, TMIN to TMAX = –40؇C to +85؇C.) Test Conditions/Comments One Channel with Full-Scale Signal (± 660 mV) Over a Dynamic Range 500 to 1 Over a Dynamic Range 500 to 1 Over a Dynamic Range 500 to 1 Over a Dynamic Range 500 to 1 Line Frequency = 45 Hz to 55 Hz AC/DC = 0 and AC/DC = 1 AC/DC = 0 and AC/DC = 1 AC/DC = 1, S0 = S1 = 1, G0 = G1 = 0 V1 = 100 mV rms, V2 = 100 mV rms @ 50 Hz Ripple on AVDD of 200 mV rms @ 100 Hz AC/DC = 1, S0 = S1 = 1.


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