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TLV320ADC3101EVM-K: How to setup the EVM for externally generated clocks

Cecil Benjamin
Prodigy 195 points
Part Number: TLV320ADC3101EVM-K
Other Parts Discussed in Thread: TLV320ADC3101

Hello

I am working on developing a solution using TLV320ADC3101. So brought this EVM for testing. My current setup is to drive the I2S and MCK of the EVM from an external I2S master microcontroller(NRF52). I am using the 44.1Khz pre loaded image. From the microcontroller I2S clocks - BCLK, SCK and MCK is giving as input to the EVM.

Case 1:

Used on board mic and clock generated in the EVM. Via usb observed the audio recorded in audacity. Works very well.

Case 2:

Used on board mic and clocks generated in the external microcontroller. Via USB of the EVM observed the audio in audacity. It is a noise.Made sure the SW settings for Clock are OFF for I2S and MCK

MCK = 2.909MHz , BCK =1.454MHz , WS = 45.45KHz.

PLLCLKIN is configured as MCK.

P=1,R=1,K=32.0000,NADC = 2, MADC=8, AOSR = 128

Thus the clock ratio is equal to MCK*(1/64) = Sampling Freq

Is my approach correct ? How to use the evm to test externally generated clock?

  • 0
    TI__Mastermind 22950 points

    Hello Cecil,

    Can you please share your SW-2 settings on the USB-MODEVM? Also, a full register dump and schematic would be helpful. 

    Regards,

    Aaron

  • 0 in reply to Aaron Estrada
    Prodigy 195 points

    Hello Aaron

    The SW-2 settings on the USB-MODEVM

    A0, A1, A2 - On, On, OFF

    USB I2S - OFF

    USB MCK - OFF

    USB SPI - ON

    USB RST - ON

    EXT MCK - OFF

    I cannot access the USB- MODEVM because of the case of BSOD error. But these are the below settings I made to the pre-loaded 16bits - 44.1Khz image.

    Clock Dividers

    • P =1 , R = 1
    • K = 32.0000
    • NADC = 2
    • MADC = 8
    • AOSR = 128 (default)
    • Clock-GenMultiplexing - MCK as PLLCLK_IN

    From the external microcontroller only BCLK, WCLK, DOUT, MCLK are connected to J5A PIN nos : 3,7,13,17

    I was observing the output in my computer using  USB - MODEVM with AUDACITY while doing this.

    Best,

    Cecil