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TLV3020ADC3101 EVM-K Change sampling rate

Ilya Kravchuk
Expert 1520 points
Other Parts Discussed in Thread: TLV320ADC3101

I want to change sampling rate on my TLV3020ADC3101 EVM-K on 8kHz. I've seen appropriate expression fS = (PLLCLK_IN × K × R) / (NADC × MADC × AOSR × P) in datasheet on TLV320ADC3101. But I don't now, wich MCLK is obtained from USB-MODEM to EVM. 
 Can anybody help me to solve this problem?

  • 0
    TI__Guru* 84915 points
    Hello, Ilya,

    You would need to modify the clocks from the TAS1020b of the EVM. This device provides the WCLK, BCLK and MCLK to the ADC3101. So, you would need a particular procedure to modify them. Please take a look at the following wiki article. These steps are used to "revive" our EVMs and also to modify the clocks frequencies.

    e2e.ti.com/.../2790.how-to-revive-a-usb-audio-evm

    Once these clocks are modified, you should get a WCLK = 8KHz, BCLK = 512KHz and MCLK = 2.048MHz. With these clocks, there's no need to configure the PLL. So, you may configure NADC = 1, MADC = 2 and AOSR = 128.

    Please let me know if you have additional questions or comments about this.

    Thank you.

    Best regards,
    Luis Fernando Rodríguez S.
  • 0 in reply to Luis Fernando Rodriguez S.
    Expert 1520 points

    Thanks for your reply. I will take it into account in future.
    I've found the MCLCK value(11.2896MHz) in ADC3101 Codec Control software and set new sampling freq by configuring NADC=11, MADC=4, AOSR=32, IADC=124