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TLV320AIC12K: problem on TLV320AIC12K

miao yu1
Prodigy 150 points
Part Number: TLV320AIC12K

Dear all,

I'm using TLV320AIC12K for the audio service. CRs is configed as follows:

R2:0x60

R4:0x94

R4:0x41

R5:0x3a

R5:0x6a

R3:0x08

R6:0x02

R1:0x61

TLV320AIC12K codec is configed as a master and MCLK is 20.48M. DOUT pin outputs the digital signal which is input onto DIN pin next frame(falling edge of FS). But there are some problems:

1. As above, I pick M=20, N=8 and P=1. As mentioned in datasheet, FS = 20.48/(16*M*N*P) = 8kHz. But the actual FS on the oscilloscope is 32kHz with 31.25us time interval of two consecutive falling edges.

   If I pick P=4 only, the actual FS is 8kHz.

2. Also I noticed that the voice from the codec. The backgound noise is low when the actual FS is 32kHz but loud when 8kHz.

thanks,

Miao.

  • 0
    TI__Expert 6440 points

    Hi Miao

    The register values and calculations look proper. Would it be possible for you to read back and verify that the correct register values were indeed written ?

    Best Regards.

  • 0 in reply to Diljith
    TI__Expert 6440 points

    Hi Miao,

    Please note that setting P = 4 would violate the condition mentioned in step 5 of the "Operating Frequencies" section of the datasheet  (Page 21)

    10 MHz <= (MCLK / P) <= 25 MHz.

    Only two values of P will satisfy the above condition for an MCLK of 20.48 -  P = 1 and P = 2.

    P = 2 is a value that can be tried along with N = 10 and M = 8.

    Best Regards.

  • 0 in reply to Diljith
    TI__Expert 6440 points

    Hi Miao,

    Did you get a chance to try the new combination or verify if there was an issue with the register programming?

    Best Regards.

  • 0 in reply to Diljith
    Prodigy 150 points

    Diljith said:

    Hi Miao

    The register values and calculations look proper. Would it be possible for you to read back and verify that the correct register values were indeed written ?

    Best Regards.

    Hi Diljith

    Sorry to reply to you so late because of so busy work.

    The values are written in the registers without error. I also use the values you recommend, but the result is the same as before.

    I also try some new values. I find that if I replace the value with 0x20 in R2 only, the FS is 8kHz which is correct.

    But the voice is strange in all configurations where I can hear someone is speaking, but I can not understand what that speaks. The voice sounds like HUM~HUM~

    Best Regards.

  • 0
    Prodigy 150 points

    Is there someone who knows how to resolve this confusing problem?-.-!!