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ADE7759 Datasheet(PDF) 1 Page - Analog Devices |
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ADE7759 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 36 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 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 companies. a ADE7759* 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 © 2002 Analog Devices, Inc. All rights reserved. Active Energy Metering IC with di/dt Sensor Interface FUNCTIONAL BLOCK DIAGRAM FEATURES High Accuracy, Supports IEC 687/1036 On-Chip Digital Integrator Allows Direct Interface with Current Sensors with di/dt Output Such as Rogowski Coil Less Than 0.1% Error over a Dynamic Range of 1000 to 1 On-Chip User-Programmable Threshold for Line Voltage SAG Detection and PSU Supervisory Supplies Sampled Waveform Data and Active Energy (40 Bits) Digital Power, Phase, and Input DC Offset Calibration On-Chip Temperature Sensor (Typical 1 LSB/ C Resolution) SPI Compatible Serial Interface Pulse Output with Programmable Frequency Interrupt Request Pin (IRQ) and IRQ Status Register Proprietary ADCs and DSP provide High Accuracy over Large Variations in Environmental Conditions and Time Reference 2.4 V 8% (20 ppm/ C Typical) with External Overdrive Capability Single 5 V Supply, Low Power Consumption (25 mW Typical) GENERAL DESCRIPTION The ADE7759 is an accurate active power and energy measure- ment IC with a serial interface and a pulse output. The ADE7759 incorporates two second-order Σ-∆ ADCs, a digital integrator (on CH1), reference circuitry, temperature sensor, and all the signal processing required to perform active power and energy measurement. An on-chip digital integrator allows direct interface to di/dt current sensors such as a Rogowski coil. The digital integrator eliminates the need for an external analog integrator and pro- vides excellent long-term stability and precise phase matching between the current and the voltage channels. The integrator can be switched off if the ADE7759 is used with conventional current sensors. The ADE7759 contains a sampled waveform register and an active energy register capable of holding at least 11.53 seconds of accumulated power at full ac load. Data is read from the ADE7759 via the serial interface. The ADE7759 also provides a pulse output (CF) with frequency that is proportional to the active power. In addition to active power information, the ADE7759 also provides various system calibration features, i.e., channel offset correction, phase calibration, and power offset correction. The part also incorporates a detection circuit for short duration voltage drop (SAG). The voltage threshold and the duration (in number of half-line cycles) of the drop are user programmable. An open-drain logic output ( SAG) goes active low when a sag event occurs. A zero crossing output (ZX) produces an output that is synchro- nized to the zero crossing point of the line voltage. This output can be used to extract timing or frequency information from the line. The signal is also used internally to the chip in the line cycle energy accumulation mode; i.e., the number of half-line cycles in which the energy accumulation occurs can be con- trolled. Line cycle energy accumulation enables a faster and more precise energy accumulation and is especially useful dur- ing calibration. This signal is also useful for synchronization of relay switching with a voltage zero crossing. The interrupt request output is an open drain, active low logic output. The interrupt status register indicates the nature of the interrupt, and the interrupt enable register controls which event produces an output on the IRQ pin. The ADE7759 is available in a 20-lead SSOP package. *U.S. Patents 5,745,323; 5,760,617; 5,862,069; AVDD RESET DVDD DGND ZX SAG CF V1P V1N V2N V2P TEMP SENSOR ADC ADC DFC ADE7759 APOS[15:0] LPF2 MULTIPLIER INTEGRATOR MULTIPLIER CLKIN CLKOUT DIN DOUT SCLK REFIN/OUT CS IRQ AGND APGAIN[11:0] dt REGISTERS AND SERIAL INTERFACE CFNUM[11:0] CFDEN[11:0] 2.4V REFERENCE 4k PHCAL[7:0] HPF1 LPF1 5,872,469. |
Similar Part No. - ADE7759_15 |
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Similar Description - ADE7759_15 |
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