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TAS6424-Q1: SAP control register 0x03[7:6] configuration

Yoshikazu Kawasaki
Expert 3510 points
Part Number: TAS6424-Q1

Hello,

My customer understands SAP control register as follows, but would you please give me your comments for the questions?

Questions

1. They understand SAP control register 0x03[7:6] configures the division ratio from MCLK, but they also do the ratio at 44.1kHz or 48kHz would be the same.  Therefore if Fs=48kHz, TAS6424-Q1 will work well even if 0x03[7:6]=0x00(44.1kHz configuration).  Is their understanding correct?

2. Would TAS6424-Q1 have any issues if 0x03[7:6]=0x00, but the actual Fs=48kHz?  They know the correct configuration when Fs=48kHz is 0x03[7:6]=0x01.

Best Regards,

Yoshikazu Kawasaki

  • 0
    TI__Genius 10830 points

    Kawasaki-san,

    1. They understand SAP control register 0x03[7:6] configures the division ratio from MCLK, but they also do the ratio at 44.1kHz or 48kHz would be the same.  Therefore if Fs=48kHz, TAS6424-Q1 will work well even if 0x03[7:6]=0x00(44.1kHz configuration).  Is their understanding correct?

    It is not the division ratio from MCLK, it is the frequency of FSYNC, which should matches with the audio FSYNC frequency. 

    The reason of 0x00 works for 44.1KHz and 48KHz is: there is some tolerance of this FSYNC frequency detection, if we set it as 44.1KHz, then use 48KHz will not trigger the fault detection.

    2. Would TAS6424-Q1 have any issues if 0x03[7:6]=0x00, but the actual Fs=48kHz?  They know the correct configuration when Fs=48kHz is 0x03[7:6]=0x01.

    Suggest to set it to the correct setting which matches with input audio FSYNC frequency.

    Dylan