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TLV320AIC31: how to control INx R/L input signal on or off in TLV320AIC31

Betty Guo
Expert 7300 points
Part Number: TLV320AIC31

Hi,

I have question is that in the page 33 of  datasheet of TLV320AIC31 show:

Note that it is not necessary to mix both fully-differential signals if this is not desired—unnecessary inputs can simply be muted using the input level control registers

but, I didn't find the mute register value in the input control registers. they only show the gain from 0db to -12dB.

could you help which register will turn on or off the input signals.

thank you

  • 0
    TI__Mastermind 22950 points

    Hello Betty,

    I think that there may be a poor choice of wording here in the data sheet. I believe that in place of "mute" it should just say "not connected". If the input is unnecessary, then why connected it to the PGA at all?

    If an input is not being used, leave it in it's default state. By default, all inputs are not connected to the Left or Right PGA's. 

    Regards,

    Aaron

  • 0 in reply to Aaron Estrada
    TI__Expert 7300 points

    Hi Aaron,

    customer need select signals in different conditions, so all the input are connected, we'd like to know how to off one input signals if not needed in this time.

    as your mentioned, customer can use default state to off the unnecessary input, right?

    thank you

  • 0 in reply to Betty Guo
    TI__Mastermind 22950 points

    Hello Betty,

    Yes, this is correct. Inputs are selected in registers 17-24. They are by default not connected to the PGA's so the customer can select which ones to route. For example, look at the register below. Reset value of bits D6-D3 are 1111. This shows at the bottom that the input is not connected to Right PGA. If the user selects bits D6-D3 as 0000 for example, then they will connect that input to the Right PGA with a gain of 0dB. 

    Regards,

    Aaron