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[FAQ] Audio ADCs/CODECs: What should I do with unused inputs on the TLV320ADC and TLV320AIC family of devices?

Collin Wells
Guru 63135 points
Other Parts Discussed in Thread: TLV320AIC3111, TLV320AIC3253, TLV320AIC3256, TLV320AIC3254, TLV320AIC3120, TLV320AIC3268, TLV320AIC3104, TLV320AIC3105, TLV320AIC3106, TLV320AIC3107, TLV320AIC3100, TLV320AIC3101, TLV320AIC3263, TLV320AIC3262, TLV320AIC3110, TLV320AIC3212, TLV320AIC3206, TLV320AIC3204, TLV320ADC3101, TLV320ADC3100, TLV320ADC3001

What is the design recommendation for terminating unused inputs on TI's Audio ADC and CODEC devices?

  • 0
    TI__Guru 63135 points

    TLV320ADC3100, TLV320ADC3101, TLV320ADC3001,TLV320AIC3203, TLV320AIC3253, TLV320AIC3204, TLV320AIC3254, TLV320AIC3206, TLV320AIC3256, TLV320AIC36, TLV320AIC3100, TLV320AIC3101, TLV320AIC3104, TLV320AIC3105, TLV320AIC3106, TLV320AIC3107, TLV320AIC3109, TLV320AIC3110, TLV320AIC3111, TLV320AIC3120, TLV320AIC3212, TLV320AIC3262, TLV320AIC3263 and TLV320AIC3268

    The recommendation for unused inputs on TI's Audio ADCs and CODECs is to provide an AC termination to GND through a ~0.47uF capacitor to prevent noise-pickup on an un-terminated input.    The analog inputs have a DC bias on them so they should not be shorted directly to GND.  The ~0.47uF capacitor provides an open-circuit for the DC bias inside the device, but provides an AC short to GND for proper termination and noise-reduction.