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[FAQ] PCM1860: What should I do with unused inputs on the PCM1860 and other devices in the PCM186x family?

Part Number: PCM1860

What should I do with unused inputs on the PCM1860 and other devices in the PCM186x family?

  • The datasheet for the PCM186x devices states in Section 9.3.1 Analog Front End that nothing should be connected to unused inputs.  

    If having floating issues is a challenge in your system, then 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.