Cirrus-logic CS5374 Manuale Utente Scaricare il pdf (Pagina 31)

CS5374

1 / [(2.048 MHz) x (15 pF)] = 32 kΩ. 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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Cirrus-logic CS5374 Manuale Utente Pagina 31