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PCM1808: No output signal

Marius THOMAZEAU
Prodigy 10 points
Part Number: PCM1808

Tool/software:

Hello there,

It is my first time asking a question on the forum !

I am trying to make my PCM1808 work with an ESP32 but I can't get any signal on the output...

I've checked all received signals on the chip and everything looks fine.

I have those clock frequencies : 11.4MHz (SCK(I) pin), 1.41MHz (BCK pin), 44.1kHz (LRC(K) pin)

I've seen on the datasheet that if the clock frequencies are not well aligned, the PCM1808 can put itself in a standby mode in which there is no output signal. It might be the cause ?

Do you have any ideas on how I can get an output signal ?

Marius 

  • +1
    TI__Intellectual 2395 points

    Hi Marius,

    I also suspect that the clock frequencies could be the issue here, as asynchronization can result in zero data at the output. The PCM1808 supports system clock frequencies of 256fs, 384fs, and 512fs. For an fs of 44.1kHz, this would equate to a 11.2896MHz system clock (256x44100). Furthermore, the PCM1808 accepts 64BCK/frame format, not 32BCK/frame as your current BCK frequency indicates. I would try increasing your BCK to 2.82MHz if possible. I can try to verify this issue in the lab later today.

    Proposed Solution:

    SCK = 11.2896MHz

    BCK = 2.82MHz

    LRCK  = 44.1kHz

    Best,

    Garret

  • 0 in reply to Garret Godfrey
    Prodigy 10 points

    Hi Garret !

    Thanks a lot, this resolved my issue ! I can now move forward on my project !

    I will probably ask other question on my DAC later on Sweat smile

    Thanks again !

    Best regards,

    Marius