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TLV320AIC23B The method of calculation of sampling rate

masahiko shimizu
Guru 11235 points
Other Parts Discussed in Thread: TLV320AIC23B

Hi

My customer is using TLV320AIC23B.
They would like to know the method of calculation of sampling rate which is determined by SR0-3.
They setting as below. and they think that sampling rate is 32kHz at below setting.
MCLK=12.288MHz, CLKOUT=0, CLKIN=1(MCLK/2), SR3=0, SR2=1, SR1=1, SR0=1, BOSR=1, USB/Normal=0


Q1:Could you tell me the method of calculation of sampling rate which is determined by SR0-3?

Q2:What sampling rate of ADC/DAC does it become in the following setting?
MCLK=12.288MHz, CLKOUT=0, CLKIN=1(MCLK/2), SR3=0, SR2=1, SR1=1, SR0=1, BOSR=1, USB/Normal=0


Best regards
Shimizu

  • 0
    TI__Guru**** 189401 points

    Hi, Shimizu-san,

    This is discussed in the d/s in the section titled, "3.3.2 Audio Sampling Rates."

    -d2

  • 0 in reply to Don Dapkus
    Guru 11235 points

    Hi -d2-san

      I read this section.

      It's written that "The following sampling-rate tables are based on CLKIN = MCLK." at Page 29 of D/S .

      Because my customer want to become sampling rate to 32 KHz and my customer set CLKIN to 1(CLKIN = 1/2*MCLK) ,  I searched "64kHz" at the MCLK = 12.288 MHz table which is page 30 of D/S. 

      But there isn't 64kHz.  

      Please suggest that  the method of sampling rate calculation which is determined by SR0-3.

      Please answer my question which is the last post.

      

    Best regards,

    Shimizu

     

  • 0
    TI__Mastermind 28585 points

    Hi Shimizu-san.

    Q1, The sample rate will scale exactly from any MCLK value in the table. Just find the SR0-3 values you want to use in the table, divide the MCLK value by the given sample rate, this will give you the over-sample rate for these settings. Now you can divide any MCLK value by the over-sample rate to determine the sample rate with a different MCLK using the same setttings. Of course if CLKIN is MCLK/2 then the result will be 1/2.

    Q2, In this case you can find all of the same values on page 29 in the first row under MCLK = 18.432 MHz so:

    18.432 MHz / 96 kHz = 192  so if you change MCLK to 12.288 MHz/192 is Fs of 64 kHz and if CLKIN is /2 then you have 32 kHz. So the sample rate for Q2 is 32 kHz.

    Best Regards,

    dave