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AD71056

Analog Devices
Part Number AD71056
Manufacturer Analog Devices
Description Energy Metering
Published Dec 6, 2006
Detailed Description www.DataSheet4U.com Energy Metering IC with Integrated Oscillator and Reverse Polarity Indication AD71056 FEATURES On-c...
Datasheet PDF File AD71056 PDF File

AD71056
AD71056

Overview
www.
DataSheet4U.
com Energy Metering IC with Integrated Oscillator and Reverse Polarity Indication AD71056 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 average real power on frequency outputs (F1, F2) High frequency output (CF) calibrates and supplies instantaneous real power Logic output (REVP) indicates potential miswiring or negative power Direct drive for electromechanical counters and 2-phase stepper motors (F1, 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.
45 V (20 ppm/°C typical) with external overdrive capability Single 5 V supply, low power (20 mW typical) Low cost CMOS process The AD71056 specifications surpass the accuracy requirements as quoted in the IEC62053-21 standard.
The only analog circuitry used in the AD71056 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 in extreme environmental conditions.
The AD71056 supplies average real power information on F1 and F2, the low frequency outputs.
These outputs either directly drive an electromechanical counter or interface with an MCU.
The high frequency CF logic output, ideal for calibration purposes, provides instantaneous real power information.
The AD71056 includes a power supply monitoring circuit on the VDD supply pin.
The AD71056 remains inactive until the supply voltage on VDD reaches approximately 4 V.
If the supply falls below 4 V, the AD71056 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, and the HPF in the current channel eliminates...


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