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TPA0253: driving BTL mode from a balanced source

David Tiefenbrunn
Intellectual 785 points
Part Number: TPA0253

I have a design I'm working on.  Using a CODEC with balanced / differential output.  If I use the 2 outputs to drive the 2 channels of the TPA0253, and set it to stereo mode, and wire the speaker as it would be for BTL mode, in theory this should work.

I have found in other designs that using the balanced output from COEDCs gives better signal to noise, lower noise.

The other choice is to use an op amp to convert the balanced output to single ended, and then drive the TPA0253 as it would be conventionally in BTL node.

My question, is this - is there any reason that my first choice wouldn't work due to DC offset or some other unknown reason I am not seeing?

  • 0
    TI__Mastermind 20085 points
    Hi David,

    I will be responding soon with further information.

    Best Regards
    José Luis Figueroa
    Audio Applications Engineer
  • 0
    TI__Mastermind 20085 points
    Hello David,

    Your first choice should work properly. Isn't that configuration working properly? If not, you could provide me a schematic of your application in order to review it and provide you a better support.

    Best Regards
    José Luis Figueroa
    Audio Applications Engineer
  • 0 in reply to José Luis
    Intellectual 785 points

    Hi Jose,

    I asked to make sure I wasn't making too big of a jump in thinking it would work the way it would seem.  For example, I don't know if anything except the audio path is changed when the stereo / BTL pin is set. 

    If it should work to use it as I described, balanced, I will go ahead and design the PCB this way. 

    I wanted to avoid the situation - that if it was known that it wouldn't work, I didn't want to design and build a prototype that was doomed.

    Thank you,

    Dave

  • 0 in reply to David Tiefenbrunn
    TI__Mastermind 20085 points
    Hi David,

    The differential mode (balanced) is better than single-ended mode because sometimes the single-ended mode can cause some problems.
    Your thoughts about this are right.

    Best Regards
    José Luis Figueroa
    Audio Applications Engineer