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ADE7768AR-RL Fiches technique(PDF) 1 Page - Analog Devices |
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ADE7768AR-RL Fiches technique(HTML) 1 Page - Analog Devices |
1 / 20 page Energy Metering IC with Integrated Oscillator and Positive Power Accumulation ADE7768 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. Specifications subject to change without notice. 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: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved. FEATURES On-chip oscillator as clock source High accuracy, supports 50 Hz/60 Hz IEC62053-21 Less than 0.1% error over a dynamic range of 500 to 1 Supplies positive-only average real power on frequency outputs F1 and F2 High frequency output CF calibrates and supplies instantaneous, positive-only real power Logic output REVP indicates potential miswiring or negative power Direct drive for electromechanical counters and 2-phase stepper motors (F1 and F2) Proprietary ADCs and DSPs 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 2.45 V (20 ppm/°C typical) with external overdrive capability Single 5 V supply, low power (20 mW typical) Low cost CMOS process GENERAL DESCRIPTION The ADE77681 is a high accuracy, electrical energy metering IC. It is a pin reduction version of the ADE7755, enhanced with a precise oscillator circuit that serves as a clock source to the chip. The ADE7768 eliminates the cost of an external crystal or resonator, thus reducing the overall cost of a meter built with this IC. The chip directly interfaces with the shunt resistor. 1U.S. Patents 5,745,323; 5,760,617; 5,862,069; 5,872,469; others pending. The ADE7768 specifications surpass the accuracy require- ments of the IEC62053-21 standard. The AN-679 Application Note can be used as a basis for a description of an IEC61036 (equivalent to IEC62053-21) low cost, watt-hour meter reference design. The only analog circuitry used in the ADE7768 is in the Σ-Δ ADCs and reference circuit. All other signal processing, such as multiplication and filtering, is carried out in the digital domain. This approach provides superior stability and accuracy over time and extreme environmental conditions. The ADE7768 supplies positive-only average real power information on the low frequency outputs, F1 and F2. These outputs can be used to directly drive an electromechanical counter or interface with an MCU. The high frequency CF logic output, ideal for calibration purposes, provides instantaneous positive-only, real power information. The ADE7768 includes a power supply monitoring circuit on the VDD supply pin. The ADE7768 remains inactive until the supply voltage on VDD reaches approximately 4 V. If the supply falls below 4 V, the ADE7768 also remains inactive and the F1, F2, and CF outputs are in their nonactive modes. Internal phase matching circuitry ensures that the voltage and current channels are phase matched, while the HPF in the current channel eliminates dc offsets. An internal no-load threshold ensures that the ADE7768 does not exhibit creep when no load is present. When REVP is logic high, the ADE7768 does not generate any pulse on F1, F2, and CF. The ADE7768 comes in a 16-lead, narrow body SOIC package. FUNCTIONAL BLOCK DIAGRAM MULTIPLIER REVP V2P V2N V1P RCLKIN REFIN/OUT F1 F2 CF SCF S0 S1 PHASE CORRECTION 4k Ω ...110101... SIGNAL PROCESSING BLOCK POWER SUPPLY MONITOR Σ-Δ ADC V1N ADE7768 ...11011001... 2.5V REFERENCE VDD AGND DGND Φ INTERNAL OSCILLATOR Σ-Δ ADC LPF HPF + + 1 6 13 7 11 8 10 12 14 16 15 9 DIGITAL-TO-FREQUENCY CONVERTER 2 3 4 5 Figure 1. |
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