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TAS5558: tas5558 and tas5624

Andre Strul
Expert 1330 points
Part Number: TAS5558
Other Parts Discussed in Thread: TAS5624

hi to all,

we are thinking of using the TAS5558 and TAS5624 in our new amplifier design. We are wondering if we could buffer the PWM output of the TAS5558 to achieve better SNR THD+N. Do you think its a good idea and (if you do) any opamps or buffers that could do that ?

thanks to all.

Andre

  • 0
    TI__Guru 62390 points
    Andre,

    We don't buffer the TAS5558 outputs before the TAS5624 or other power stages which accept PWM input. In my experience adding a buffer cannot make an input signal better, it can only help you recover signals which are plagued by PCB issues such as really long traces, excess line capacitance or inductance. If you have a particular system design in mind we can take a look at it and make a recommendation.

    Regards,

    -Adam
  • 0 in reply to Adam Sidelsky
    Expert 1330 points

    Adam,

    thanks for the reply; we understood for buffering . what is the maximum distance (or optimal distance between  the ICs) ?

    thanks

    Andre

  • 0 in reply to Andre Strul
    TI__Guru 62390 points

    Andre,

    This is dependent on many factors to give a hard and fast rule unfortunately. My recommendation would be to leave room for a buffer if you think it might be an issue and then you could always depopulate it if not needed. This being said, we currently pass these signals over a 6 inch PCB, through a ribbon cable, and then another few inches on a second board with no buffer and no issue.

    Regards,

    -Adam