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TAS5780M: Ping sound when changing volume

Marco Rojas
Intellectual 1680 points
Part Number: TAS5780M

Tool/software:

Hi team,

I have a customer that makes speakers/game calls with the below inquiry. Let me know what you think and thanks in advance!

"I am having an issue with the TAS5780M and volume changes. I am changing the volume in 1 dB steps, however, the output is not a smooth change in volume. The effect is a 'ping' sound that happens with each change in volume. Is there someway to make volume changes happen very smoothly?"

Marco

  • 0
    TI__Guru* 99205 points

    Hi Marco,

    Can you specify which volume control is being used for this test? Perhaps you can use the Fine Volume Control rather than the DAC Digital Volume Control.

    Best regards,
    -Ivan Salazar
    Applications Engineer

  • 0 in reply to Ivan Salazar
    TI__Intellectual 1680 points

    Hi Ivan,

    Customer feedback below:

    "I am currently using the digital volume. I am ramping the volume up and down over a range of 20 dB. I move in steps of 1 dB. It takes approximately 1 second to ramp up and 1 second to ramp down. What I need to achieve is a smooth change in volume. What would you recommend?"

    Marco

  • +1 in reply to Marco Rojas
    TI__Guru* 99205 points

    You can try using register 0x3F setting the ramp steps to minimum (0.5dB), this is 2dB by default.

    Best regards,
    -Ivan Salazar
    Applications Engineer

  • 0 in reply to Ivan Salazar
    TI__Intellectual 1680 points

    Hey Ivan,

    Reviving this thread since customer is asking a follow-up to this process.

    "Can you please have someone look at the following commands I am sending to change the fine volume to -60dB on a TAS5780M. For some reason, nothing happens after I send the commands.

     

    96 00 00
    96 7F 8C
    96 00 21
    96 4C 00 10 62 4D
    96 00 00
    96 7F 8C
    96 00 01
    96 10 00
    96 00 00
    96 7F 00
    96 00 00
    96 00 00
    96 7F 8C
    96 00 21
    96 48 00 10 62 4D
    96 00 00
    96 7F 8C
    96 00 01
    96 10 00
    96 00 00
    96 7F 00
    96 00 00"

    Marco

  • 0 in reply to Marco Rojas
    TI__Guru* 99205 points

    Hi Marco,

    I'm getting an evaluation module to double check this on my side, will update you next week.

    Best regards,
    -Ivan Salazar
    Applications Engineer