• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Subscribers 30 subscribers
  • Views 148 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TAS58xx: Question on PWM Phase Selection / Synchronization in Multi-devices

Jay Yoo
Intellectual 1826 points

Hi Expert,

I got 2 questions on multi-devices PWM phase selection.

Q1. If a customer uses 2 devices, is there any recommended combination for phase selection between phase0 to phase4? 

Q2. If a customer uses multiple device and multiple phase, What are the expected trade offs in terms of audio quality?

Best regards, 

Jay

  • 0
    TI__Expert 5170 points

    Hi, Jay.

    About your two questions.

    1. In the case of two devices, you can choose any two combination. 

    The phase difference of the two channels of TAS58xx is 180 degrees, which has a certain suppression effect on EMC. Phase shifting is used between multiple devices to avoid the situation where the noise phase is superimposed in the same phase.

    2. This function will not affect the audio quality.

    BR.

    Wei Qiu.

  • +1 in reply to Wei Qiu
    TI__Intellectual 1826 points

    Hi Wei, 

    Thanks for your explanation.

    For about 180 degrees phase difference between channels, I thought it would make audio quality worse if PWM phase is reversed between channels . So it is recommended to match in-phase PWM between channels. What do you think? Isn't there any degradation in audio quality when using out of phase PWM between L and R?

    Thanks,

    Jay

  • +1 in reply to Jay Yoo
    TI__Expert 5170 points

    Hi Jay.

    Sound quality won't make any difference.

    Only the PWM phases of the two channels differ by 180 degrees, which does not affect the phase of the output.

    BR.

    Wei Qiu.

  • 0 in reply to Wei Qiu
    TI__Intellectual 1826 points

    Hi Wei,

    Thanks for letting me know. Great help.

    Thanks!

    Jay