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TAS5508C when FS change

Terry Wu
Expert 1680 points
Other Parts Discussed in Thread: TAS5508C, TAS5558, TAS5548, DRV632

Dear Sirs,

May I know what we need to config TAS5508C by I2C when sampling rate changed ?

Will TAS5508C automute output PWM during input MCLK/BCLK/FS dis-continue ?

Actually we hear pop noise when different source(FS) switched.

Thanks in advance !

  • 0
    TI__Guru**** 189399 points

    Hi, Terry,

    the guy who needs to work on this is out until Monday. I apologize for the delay. 

    have you seen our latest parts in this family? Tas5548 and tas5558?

    d2

  • 0 in reply to Don Dapkus
    Expert 1680 points

    Hello Don,

    Yes ! I know TAS5548/58 with ASRC function.
    Released in end of 2012.

    Pls kindly give suggestion of TAS5508C . TKS !

  • 0
    TI__Guru**** 189399 points
    Hi, Terry,

    Ok, we will check it out. The guy who can work with you on this issue is OOO, but he will be back on Monday.

    Sorry for the delay.

    D2=
  • 0
    TI__Mastermind 33420 points

    Hi Terry:

    When Fs changes, the device automatically adapts to the new Fs.  You don't need to write anything on I2C.  However, you may want to change register 0x03 bit D4 to soft mute on recovery from clock error during the initialization.  The pop depends on the power stage more than the modulator (TAS5508C).  If you have single-ended configuration on the power stage, the pop may be audible.

    Thanks,

    Tuan

  • 0 in reply to Tuan
    Expert 1680 points

    Hello Tuan,

    We already test this register bit and can see some improvement but no for all PCBA.

    My post stage was LPF + DRV632 line out to sub-woofer.

    May I know what's PWM behavior when apply new Fs ?

    How fast TAS5508C PLL could lock new Fs ?

    Any electrical character to describe "soft unmute" this register bit  ?  

    Many thanks your help !