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Thread: Clock source for Audio board

  1. #1

    Clock source for Audio board

    I am working on a project to interface the Teensy audio adaptor board ( SGTL5000) to a different microcontroller. In this case, it is a STM32f429I-DISCO. I am using my mcu to generate the
    master clock signal (MCLK). The output of the PWM from my MCU looks not that great (16 mhz).
    Click image for larger version. 

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    Will the SGTL5000 accept such a noisy input clock source, or does it need some sort of conditioning to get a better square wave?

  2. #2
    Senior Member PaulStoffregen's Avatar
    Join Date
    Nov 2012
    That should probably work.

    Perhaps the signal is actually better, but you're getting ringing due to the ground lead on your scope's probe?

  3. #3
    OK. THanks for the suggestion. I'm going to roll the dice and move on, and see if I can get the board to work.

  4. #4
    Senior Member Ben's Avatar
    Join Date
    Jul 2013
    You might be interested in what I wrote here: in posts #5 and #17

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