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TLV320DAC3100 Input Lines

Scott McElroy1
Intellectual 2155 points
Other Parts Discussed in Thread: TLV320DAC3100

Team,

I am using the TLV320DAC3100 and had a few questions.

1) What is the proper way to terminate unused clock inputs?

2) What is the proper way to terminate unused analog inputs (we will not have microphone or AUX in)

3) If we tied the SPKVDD directly to our battery will the DAC tolerate extended periods where the VBAT is applied to SPKVDD while all of the other power rails are down?

Help on this is greatly appreciated! Thank you.

  • 0
    TI__Expert 4840 points

    Scott

    1) The unused clocks inputs can be left floating. The device needs at least one master clock input.

    2)  Leave the unused analog inputs floating. You can connect them to ground through capacitor.

    3) You can leave the SPKVDD connected to VBAT for any period of time while rest of the supplies are powered down.

  • 0 in reply to Vins
    TI__Intellectual 2155 points

    Vins,

    Thank you for the quick response on these questions, I have a few more that concerned me as well.

    1) We need some more detail about the leakage from SPKVDD to AVDD - our Lithium cells will sometimes droop to 3.0V if the customer runs the battery down that far.  I don't mind if there is slight leakage, but I'd like some test data or characterization information.  Is this situation bad enough that I need to put a switch on my AVDD so I can shut down the TLV320DAC3100 while I am not running audio?  The TLV320DAC3100 actually uses three power rails - I'd hate to suffer the expense of putting power switches on all three rails.

    2) What about filtering on the speaker outputs?  We're using some series filters to guard against excessive emissions, but I didn't find guidance in the datasheet.  Is it overkill that may distort the output?  Are there better alternatives TI would recommend?

    Thanks for the continued support! Please get back to me as soon as you can.

  • 0 in reply to Scott McElroy1
    TI__Expert 4840 points

    Scott,

    Find answers below,

    1)  At any point of time SPKVDD must be greater than or equal to AVDD to prevent the leakage. There wouldn't leakage if this condition is met.

    2) There is an application note available for EMI filtering on speaker outputs, in the AIC3100 product folder under technical documents