• State Resolved
  • Locked Locked
  • Replies 6 replies
  • Subscribers 31 subscribers
  • Views 496 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TLV320AIC3120: Application questions

Kazuki Itoh
Genius 11681 points

Part Number: TLV320AIC3120

Hello team,

Could you please help me to clarify a couple of things?

  1. If I don't use SPKP/SPKM, is it ok to leave SPKVDD floating?
  2. In this thread, it is mentioned that the unused input should provide ac termination to ground with through 0.47uF cap. Is it OK to change it to 0.1uF?
  3. About the ac coupling cap at MIC input, the DS schematic uses 0.1uF while EVM schematic uses 0.47uF. Is it OK to use 1uF cap for MIC input?

Regards,

Itoh

  • 0
    TI__Mastermind 22950 points

    Hello Itoh,

    Please see my answers below:

    1. SPVDD is only used for the Class-D driver so it may be okay to leave floating. I will have to double check with my colleagues on this and will get back to you. 

    2. Yes, 0.1uF is okay to use for unused input termination. 

    3. 0.1uF is okay to use as the AC coupling cap for the MIC input. Note that the value of this capacitor will affect the cutoff frequency of the High-pass filter created with the AC coupling capacitor and the input impedance. Please use the value that best fits your application. 

    Regards,
    Aaron Estrada

  • +1
    TI__Mastermind 22950 points

    Hello Itoh,

    Please see my answers below:

    1. SPVDD is only used for the Class-D driver so it may be okay to leave floating. I will have to double check with my colleagues on this and will get back to you. 

    2. Yes, 0.1uF is okay to use for unused input termination. 

    3. 0.1uF is okay to use as the AC coupling cap for the MIC input. Note that the value of this capacitor will affect the cutoff frequency of the High-pass filter created with the AC coupling capacitor and the input impedance. Please use the value that best fits your application. 

    Regards,
    Aaron Estrada

  • 0 in reply to Aaron Estrada
    TI__Genius 11681 points

    Hello Aaron-san,

    1. OK, please let me know when you check it.

    3. My customer is trying to pick up 1uF, not 0.1uF for better availability. Could please check it again?

    Regads,

    Itoh 

  • +1 in reply to Kazuki Itoh
    TI__Mastermind 22950 points

    I Itoh,

    Yes, 1uF is okay. Again, the customer will need to make sure that the high pass filter cutoff frequency is acceptable in their application. 

  • 0 in reply to Aaron Estrada
    TI__Genius 11681 points

    Hello Aaron-san,

    Did you double check about the SPKVDD with your colleagues?

    Regards,

    Itoh

  • 0 in reply to Kazuki Itoh
    TI__Mastermind 22950 points

    Hi Itoh-san,

    Leaving SPKVDD powered down if not using the integrated class-D amplifier should be OK. 

    Regards,

    Aaron Estrada