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TLV320AIC3101: Re-Sync

Kailyn Chen
Genius 9560 points
Part Number: TLV320AIC3101

Hello，

What does the" group delay " meaning? According to the AIC3101 datasheet,  the Page 0/Register 9 describes the re-sync, could you please help to explain about the "re-sync’？ And what is the advantage of the re-sync? If we configured the bit=0, Don't care,  that is no re-sync, what would happened? 

www.ti.com/.../TLV320AIC3101

Best regards

Kailyn

  • 0
    TI__Mastermind 22950 points

    Hello Kailyn,

    Group delay is essentially the delay from the modulator and filters inside the CODEC. The Re-Sync feature detects if the WCLK rising edge phase has drifted more than +/- FS/4 (where Fs is ADC sample rate or DAC sample rate configured) duration with respect to expected WCLK rising edge phase. This is assuming the periodic WCLK after very first WCLK rising edge observed after ADC/DAC powered-up. If it detect the phase has been drifted more than +/- FS/4 then to synchronize signal processing with external frame signal (WCLK), it power-down and re-power-up the internal signal processing engine again.

    I hope this helps. 

    Regards,

    Aaron

  • 0 in reply to Aaron Estrada
    TI__Genius 9560 points

    Hi Aaron,

    Thank you for your reply.

    The electrical characteristics listed the typical value of ADC filter group delay is 17/fs and the DAC filter group delay is 21/fs. So I'd like to confirm if it is fs/17 and fs/21 instead of 17/fs and 21/fs? Because the Re-sync function happened during  phase drifted time is more than fs/4.  So I'd like to confirm.

    Best regards

    Kailyn 

  • 0 in reply to Kailyn Chen
    TI__Mastermind 22950 points

    Hello Kailyn,

    The group delays are 17/Fs and 21/Fs and not the other way around. 

    Regards,
    Aaron