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PCM3168A-Q1: DOUT1 has no signal output

Rogers Chen
Intellectual 825 points
Part Number: PCM3168A-Q1
Other Parts Discussed in Thread: PCM3168, PCM3168A

Dear experts,

We use the PCM3168 as the audio ADC for our products. The schematic and software configuration are shown below. We confirm that the software has written to PCM3168 over the I2C bus, but DOUT1 does not have any output signal. Can you help check the SCH and software configuration and tell us how we can resolve the issue? Many thanks!

       

  • 0
    TI__Mastermind 24245 points

    Hello Rogers,

    Thank you for reaching out. The schematic and code snippet look good. What clock values are provided to the PCM3168A from the host controller? Can you include screen captures? I would like to start by checking if the CODEC is receiving the expected clock frequencies.

    Best,
    Andrew

  • 0 in reply to Andrew J
    Intellectual 825 points

    Hi Andrew,

    I captured waveform screenshots of LRCKAD and BCKAD (SCKI) as shown below

         LRCKAD-48KHZ

       BCKAD (SCKI) clock-12.288MHZ

  • 0 in reply to Rogers Chen
    TI__Mastermind 24245 points

    Hello Rogers,

    Please share a screen capture of DOUT as well. Aside from the ASI configuration. I assume the rest of the registers are default. This should be correct. Is the behavior of "no value on DOUT" seen on other boards? 

    All the clocks are from the host controller. Can you please probe the power rails of the CODEC to make sure the device is powered correctly? 

    Best,
    Andrew