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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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CS5374 датащи(PDF) 31 Page - Cirrus Logic |
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CS5374 датащи(HTML) 31 Page - Cirrus Logic |
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31 / 44 page  CS5374 CS5374 DS862F1 DS862F1 31 1 / [(2.048 MHz) x (15 pF)] = 32 k Ω. While the size of the internal capacitor is fixed, the voltage reference input impedance can vary with MCLK. The voltage reference external RC filter series re- sistor creates a voltage divider with the VREF in- put impedance to reduce the effective applied input voltage. To minimize gain error resulting from this voltage divider effect, the RC filter series resistor should be the minimum size recommended in the voltage reference device data sheet. 7.5 VREF Accuracy The nominal voltage reference input is specified as 2.500 V across the VREF ± pins, and all CS5374 gain accuracy specifications are measured using a nominal voltage reference input. Any variation from a nominal VREF input will proportionally vary the analog full-scale gain accuracy. Since temperature drift of the voltage reference re- sults in gain drift of the analog full-scale amplitude, care should be taken to minimize temperature drift effects through careful selection of passive compo- nents and the voltage reference device itself. Gain drift specifications of the CS5374 do not include the temperature drift effects of external passive components or of the voltage reference device it- self. |
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