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AD7751AAN-REF Datenblatt(PDF) 1 Page - Analog Devices |
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AD7751AAN-REF Datenblatt(HTML) 1 Page - Analog Devices |
1 / 16 page REV. A 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD7751* One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2000 Energy Metering IC With On-Chip Fault Detection FEATURES High Accuracy, Supports 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 Two-Wire Distribution Systems AD7751 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 Two-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 The AD7751 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 require- ments as quoted in the IEC1036 standard. FUNCTIONAL BLOCK DIAGRAM AC/ DC AVDD DVDD HPF AGND DGND PHASE CORRECTION 4k ...110101... SIGNAL PROCESSING BLOCK PGA 1, 2, 8, 16 POWER SUPPLY MONITOR AD7751 ...11011001... 2.5V REFERENCE PGA 1, 2, 8, 16 ADC ...110101... B>A A>B A<>B ADC ADC FAULT MULTIPLIER LPF DIGITAL-TO-FREQUENCY CONVERTER G0 G1 V1A V1N V2P V2N V1B A B CLKOUT CLKIN REFIN/OUT RESET F1 F2 CF REVP SCF S0 S1 *US Patent 5,745,323; 5,760,617; 5,862,069; 5,872,469. The only analog circuitry used in the AD7751 is in the ADCs and reference circuit. All other signal processing (e.g., multipli- cation 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 AD7751 incorporates a novel fault detection scheme that warns of fault conditions and allows the AD7751 to continue accurate billing during a fault event. The AD7751 does this by continuously monitoring both the phase and neutral (re- turn) 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 AD7751 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 AD7751 includes a power supply monitoring circuit on the AVDD supply pin. The AD7751 will remain in a reset condition until the supply voltage on AVDD reaches 4 V. If the supply falls below 4 V, the AD7751 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 AD7751 also has anticreep protection. The AD7751 is available in 24-lead DIP and SSOP packages. |
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