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ADE7757 Datasheet(PDF) 1 Page - Analog Devices |
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ADE7757 Datasheet(HTML) 1 Page - Analog Devices |
1 / 16 page ADE7757* Energy Metering IC with Integrated Oscillator 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 that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. 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 © 2003 Analog Devices, Inc. All rights reserved. FEATURES On-Chip Oscillator as Clock Source High Accuracy, Supposes 50 Hz/60 Hz IEC 521/IEC 61036 Less than 0.1% Error over a Dynamic Range of 500 to 1 The ADE7757 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 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) On-Chip Reference 2.5 V (20 ppm/ C Typical) with External Overdrive Capability Single 5 V Supply, Low Power (20 mW Typical) Low Cost CMOS Process AC Input Only FUNCTIONAL BLOCK DIAGRAM MULTIPLIER REVP V2P V2N V1P HPF RCLKIN REFIN/OUT F1 F2 CF SCF S0 S1 PHASE CORRECTION 4k ...110101... SIGNAL PROCESSING BLOCK POWER SUPPLY MONITOR - ADC V1N ADE7757 ...11011001... LPF 2.5V REFERENCE DIGITAL-TO-FREQUENCY CONVERTER VDD AGND DGND - ADC INTERNAL OSCILLATOR GENERAL DESCRIPTION The ADE7757 is a high accuracy electrical energy measurement IC. It is a pin reduction version of the ADE7755 with an enhance- ment of a precise oscillator circuit that serves as a clock source to the chip. The ADE7757 eliminates the cost of an external crystal or resonator, thus reducing the overall cost of a meter *U.S. Patents built with this IC. The chip directly interfaces with the shunt resistor and operates only with ac input. The ADE7757 specifications surpass the accuracy requirements as quoted in the IEC 61036 standard. The AN-679 Application Note can be used as a basis for a description of an IEC 61036 low cost watt-hour meter reference design. The only analog circuitry used in the ADE7757 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 time and extreme environmental conditions. The ADE7757 supplies average real power information on the low frequency outputs F1 and F2. These outputs may be used to directly drive an electromechanical counter or interface with an MCU. The high frequency CF logic output, ideal for calibra- tion purposes, provides instantaneous real power information. The ADE7757 includes a power supply monitoring circuit on the VDD supply pin. The ADE7757 will remain inactive until the supply voltage on VDD reaches approximately 4 V. If the supply falls below 4 V, the ADE7757 will also remain inactive and the F1, F2, and CF outputs will be in their nonactive modes. Internal phase matching circuitry ensures that the voltage and current channels are phase matched while the HPF in the cur- rent channel eliminates dc offsets. An internal no-load threshold ensures that the ADE7757 does not exhibit creep when no load is present. The ADE7757 is available in a 16-lead SOIC narrow-body package. 5,745,323; 5,760,617; 5,862,069; 5,872,469. |
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