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PCM2706: No analog audio output on PCM2709

Simao Borges Varela
Prodigy 10 points
Part Number: PCM2706

Hello, 

I'm using a PCM2706, to convert audio from computer (USB) to analog audio.

I have received my boards, and there is no audio on analog output, but I can see datas and clocks on I2S interface on a scope.

Can you help me to solve this issue ?

Best Regards,

Simão

  • 0
    TI__Mastermind 25240 points

    Hello , If there is jumper setting on the EVM for  enabling USB, please make sure it is set correctly.

    When you connect your board to PC or laptop and  want to hear the  audio through the board and the  speakers connected to output,  make sure  PC sees it as speaker.

    On the right corner of your Windows, click on SPEAKER icon and see if it is the board or your computer's speaker. 

    It might be that you need to go to your control panel and set it up:

    Without any board connect to my PC, I get:

    After i connect an  EVM via USB to my PC , I get this:

    Regards,

    Arash

  • 0 in reply to Arash Loloee
    Prodigy 10 points

    Hi Arash,

    Thank you for your feedback.

    I can see my board as sound card on device manager when I plug it to computer through USB.

    Windows accepts to play sound on my board, but I can't see any signal (using a scope) on analog audio outputs.

    But I can see signals on audio I2S output, is there any limitation or issue that prevent having analog audio output and I2S at same time, I didn't find any information about it in the datasheet.

    Best Regards,

    Simão 

  • 0 in reply to Simao Borges Varela
    TI__Genius 13610 points

    Hello Simão,

    Arash is out of office until tomorrow, but he will be sure to reply when he comes back in.

    Thanks for the patience.

    Best Regards,

    Carson

    Low Power Audio Applications Engineer

  • 0 in reply to Carson Allen
    TI__Mastermind 25240 points

    Hi, Can you make sure you have all the needed connections correctly done, for example if you are in Self power or USB power mode and Power source select pin is connected accordingly.

    Can you monitor all the voltages on the supplies as well as? Basically you need to make sure your "pins" set up and connections are  correct first. 

    You should be able to monitor the output on oscilloscope. You can use Audacity software  to send a sinewave or another signal and monitor the output.

    Regards,

    Arash