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TPA3118D2: POP noise when mute in SPW mode

KANE SUNG
Prodigy 210 points
Part Number: TPA3118D2

Dear Sir,

We found that when we set TPA3118D2 mute pin to high in SPW mode, a small POP noise occur on speaker output.

But if we set to BD mode, there is no POP in same case.

Would you provide explanation on  this case?

According to datasheet, the difference between two mode should be THD and efficiency only?

Thanks.

BRS,

Kane

  • 0
    TI__Expert 6985 points
    Hello Kane! Shawn can answer any further questions, although he is on travel right now. In the meantime... is what you are referring to above based on the standard TI EVM or on your own design? Also, what power level are you putting on the input, and what type of load are you trying to drive and wire length? Also, if it is your own design is there a front-end circuit in this application feeding into the TPA3118, perhaps an amplifier or CODEC? Please keep in mind that any device between DAC/Codec and audio amplifer is not necessary, because it can induce unsteady factors.
    In your application, please keep an eye on the common voltage on the left side of the capacitors, to make sure the front-end has already been enabled and the common voltage is settled down before enabling the audio amplifier. Also, for general guidance on pop noise, please refer to the materials at www.ti.com/.../slea044.pdf www.ti.com/.../sloa108.pdf Thanks, Jeff
  • 0 in reply to Jeff Kohnle
    TI__Expert 6985 points
    Hello Kane! Did this answer your question? Thanks, Jeff
  • 0
    Prodigy 210 points
    Hi Jeff,

    We confirm POP caused by common voltage at input stage, and we would find out why POP improved on BD mode.
    Our customer is asking why we choose BD mode instead of SPW mode, and BD mode cause POP.
    We can't find any relationship between POP and BD/SPW mode in datasheet.
    Do you have any idea?
    Thanks.

    BRS,
    Kane
  • 0 in reply to KANE SUNG
    TI__Expert 6985 points
    Hello Kane! Depending on your design, Pop cannot always be completely be eliminated. Please reference: e2e.ti.com/.../2004039 as this may be helpful. Thanks, Jeff
  • 0 in reply to KANE SUNG
    TI__Mastermind 24835 points
    Hi Kane,
    As Jeff explained, the main cause of a pop noise is the common voltage. So we need to use differential input mode as much as possible and also need to make the input differential route matching to minimize the pop noise.
    1SPW mode and BD mode are different modulation modes, so the common voltage setup mechanism are also different. The charging precess for 1SPW mod is longer and then it's easier to induce the pop noise. But, as I described above, there shouldn't be any pop noise for the both modes as soon as the input matching is good.
    Best regards,
    Shawn Zheng
  • 0 in reply to Shawn Zheng
    TI__Expert 6985 points
    Hello Kane! Did this answer your question... if so could you please close the thread? Thanks for your support! Thanks, Jeff
  • 0 in reply to Shawn Zheng
    Prodigy 210 points
    Thanks, we'll explain to our customer with above.