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AD7755ABRS Datasheet(PDF) 1 Page - Analog Devices |
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AD7755ABRS Datasheet(HTML) 1 Page - Analog Devices |
1 / 16 page REV. B 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 AD7755* 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 Pulse Output FUNCTIONAL BLOCK DIAGRAM MULTIPLIER AC/ DC CLKOUT V1P V1N G0 V2P G1 AVDD DVDD HPF CLKIN REFIN/OUT F1 F2 CF REVP SCF S0 S1 RESET AGND DGND PHASE CORRECTION 4k ...110101... SIGNAL PROCESSING BLOCK ADC PGA x1, x2, x8, x16 POWER SUPPLY MONITOR ADC V2N AD7755 ...11011001... LPF 2.5V REFERENCE DIGITAL-TO-FREQUENCY CONVERTER FEATURES High Accuracy, Supports 50 Hz/60 Hz IEC 687/1036 Less than 0.1% Error Over a Dynamic Range of 500 to 1 The AD7755 Supplies Average Real Power on the Frequency Outputs F1 and F2 The High Frequency Output CF Is Intended for Calibration and Supplies Instantaneous Real Power The Logic Output REVP Can Be Used to Indicate a Potential Miswiring or Negative Power 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 6 8% (30 ppm/8C Typical) with External Overdrive Capability Single 5 V Supply, Low Power (15 mW Typical) Low Cost CMOS Process GENERAL DESCRIPTION The AD7755 is a high accuracy electrical energy measurement IC. The part specifications surpass the accuracy requirements as quoted in the IEC1036 standard. See Analog Devices’ Application Note AN-559 for a description of an IEC1036 watt-hour meter reference design. The only analog circuitry used in the AD7755 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 AD7755 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, or interfacing to an MCU. The AD7755 includes a power supply monitoring circuit on the AVDD supply pin. The AD7755 will remain in a reset condition until the supply voltage on AVDD reaches 4 V. If the supply falls below 4 V, the AD7755 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 phase matched whether the HPF in Chan- nel 1 is on or off. An internal no-load threshold ensures that the AD7755 does not exhibit any creep when there is no load. The AD7755 is available in 24-lead DIP and SSOP packages. *U.S. Patents 5,745,323, 5,760,617, 5,862,069, 5,872,469. |
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