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TLV320DAC3203: please help me get the gain value,thank you!

user5859485
Prodigy 200 points
Part Number: TLV320DAC3203

Hello:

      I want to know the value of amplifier gain, it is covered by black block ,thank you so much !

  • 0
    TI__Guru* 84915 points

    Hi,

    The amplifier gain is actually configurable. You can set a gain value in the range of 0dB to -72.3dB. Also, you can set the value to MUTE. The register that configure the gain for INL is located in page 0 / register 22 (0x16). The register associated to the gain for INR is located in page 0 / register 23 (0x17).

    http://www.ti.com/lit/ug/slau434a/slau434a.pdf#page=109

    Please let me know if you have additional questions or comments on this. We will be glad to help you.

    Best regards,
    Luis Fernando Rodríguez S.

  • 0 in reply to Luis Fernando Rodriguez S.
    Prodigy 200 points

    Hi sir. :

        Thank you for your reply!

        One thing want to consult you: why is the amplifier gain less than 1 (0dB to -72.3dB)?

        I think if we use analog microphone sensor it will create very small signal, designer need an additional amplifier to make signal big enough. So, why is the amplifier`s gain less than 1? maybe we need the amplifier gain greater than 1, maybe +20db or +40db. and designer will save the additional amplifier and cost down.

        Thank you so much!

  • 0 in reply to user5859485
    TI__Guru* 84915 points

    Hi,

    Usually, these analog inputs are not used for microphone purposes. They are designed to connect a line signal, which uses to be higher than a microphone signal. That's why an amplifier with lower gain is used in this design. If a higher gain is required, the headphone amplifiers can be configured with a gain from -6dB to 29dB as shown in the block diagram.

    For more details, please consult page 1 / registers 16-17.

    Best regards,
    Luis Fernando Rodríguez S.