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Original question:

TPA2016D2: Question about the register of TPA2016D2

TPA2016D2: Question about the Gain Limiter Level

Lumina Gui
Expert 2975 points
Part Number: TPA2016D2

Dear TI Engineer,

We have some question about the Gain Limiter Level in the TPA2016D2 debug tools. We want to know what is the principle of this limiter in PA? Is it dynamic gain control (dynamic reduction of gain for large signals and normal amplification for small signals), or is it simply cut off when it exceeds this threshold. During our debugging , we found that noise may occur when the input signal is too large.

Thanks,

Kind Regards

  • 0
    TI__Guru** 100965 points

    Hi Lumina,

    You can refer to data sheet section 9.3.4.2: https://www.ti.com/lit/ds/symlink/tpa2016d2.pd#page=15&zoom=100,0,824

    Does the noise occur only when using the limiter? Or the noise is the reason why you need to enable the limiter?
    You should make sure that the limiter is set so that the maximum level is lower than the supply voltage to avoid clipping, and also lower than the power rating of the speaker so that it's not physically clipping due to overexcursion.

    Best regards,
    -Ivan Salazar
    Applications Engineer

  • 0 in reply to Ivan Salazar
    Expert 2975 points

    Hi Ivan,

    Ivan Salazar said:
    Does the noise occur only when using the limiter? Or the noise is the reason why you need to enable the limiter?

    We plan to use a limiter to limit the power within a certain range, but found noise during the testing. When we tried to lower the limiter further, and found that the noise was more pronounced. So we would like to ask what is the principle of the limiter?

    Thanks,

    Kind Regards

  • 0 in reply to Lumina Gui
    TI__Guru** 100965 points

    Hi Lumina,

    Understood, I would start by testing with no compression (1:1) and 0dB gain, then apply the limiter and then the gain. Add the compression at the very end to make sure that is not affecting the rest of your testing.

    Best regards,
    -Ivan Salazar
    Applications Engineer