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PCM5102A: PCM5102A general issue

cayden liu
Intellectual 1276 points
Part Number: PCM5102A

Tool/software:

Hi TI,

I develop audio board by using PCM5102A now. Schematic as shown below:

I got some question for this device:

1.What does it look like the output waveform is normal?
2. How to adjust the output of a lot of clutter?
3. Is there a problem with the schematic diagram?
4. Now the template is directly PCM_OUTR or PCM_OUTL have no sound coming out of the headphones separately and on the ground?

BR

Cayden

  • 0
    TI__Mastermind 30671 points

    Hello Cayden, 

    Based on your schematic, you have selected I2S format, so make sure that your input format is I2S as well ( refer to Figure 14. I 2S Audio Data Format). 

    Also make sure your I2S clks are correct and comply with this equation.

    BCLK= # of Ch.  *  Ch depth  * Fs     

    for example, for a stereo 32 Bit with sampling frequency of 48KHz, your BCK has to be 3.072MHz.

    In my experience, most of the issues with DAC and ADC are due to issues with clks or data format. Specially that this DAC is very simple  HW controlled.

    Your schematic looks ok, although I would prefer to use a 10k or 100K for my PU/PD resistors. 

    To test any DAC, the simplest method is to send a 1KHz sinewave ( I use an AP)  and monitor the output of the DAC on a scope to see if it is a 1KHz sinewave.

    Let me know if you still have any issue.

    Regards,

    Arash