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TPA2011D1: Impacted performance with gain higher than 2V/V.

FINN NIELSEN
Prodigy 20 points

Part Number: TPA2011D1

We are looking to implement a class amplifier in a client product and has found TPA2011D1 suited.

Datasheet however states that a gain of maximum 6dB (2V/V) is desireable for the best performance. What would be affected if using 6.7V/V gain?

  • 0
    TI__Prodigy 200 points

    Hi Finn,

    Optimal device performance is achieved with a gain of 2 V/V or lower, which keeps a high voltage at the input and makes the inputs less susceptible to noise. Increasing the gain will also increase crosstalk signal coupling.

    Regards,

    Isaac

  • 0 in reply to Isaac Buliva
    Prodigy 20 points

    OK. I did expect noise to be impacted. I do not get the Crosstalk part as it is a Mono BTL drive.....

    There are no data on build in amplifier bandwidth and we were a little afraid that it could be affected?  

    Noise is not an important parameter for this application and we would like not to have to add additional gain in front.

    Is it safe to assume that the 20uV output noise then will becomming 6.7/2 times higher? This will not be an issue for us.

  • 0 in reply to FINN NIELSEN
    TI__Prodigy 200 points

    Hi Finn,


    Bandwidth will not be a concern with higher gain as the changes will be outside of the audio band. Yes, the noise will increase linearly with gain as you mentioned.


    Regards,

  • 0 in reply to Isaac Buliva
    Prodigy 20 points

    Thank's, we also had i through TINA and it agrees that D-amp matches our application with the higher gain. Great tool.