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TSW14J56 with EVM DAC38J84 @ 1966.08 MHz

Alexander Lozhkin
Prodigy 100 points
Other Parts Discussed in Thread: DAC38J84, DAC38J84EVM, LMK04828, LMK04821

Hello there,

It seems that TSW14J56 does not supports mode when DAC38J84 clock is 1966.08 (DAC Rate 983.04 MHz, Interpol ration 2) MHz. Anyway, I got the message that such operation is not possible with on-board reference clock. Is there any opportunity to run DAC at this clock configuration?

  • 0
    TI__Guru* 78594 points
    Hi Alexander,

    The DAC38J84EVM and TSW14J56EVM will support the DAC38J84 operating at 2x int, Fdata = 983.04MHz, Fdac = 1966.08MHz. On the DAC38J84 EVM GUI, you will need to select "external clocking" mode instead of "onboard clocking" mode (step 1 of the main GUI panel).

    You will need to provide a external 1966.08MHz clock source to the J17 connector of the DAC EVM.

    The reason for this is because the on-board LMK04828 clock chip does not have the VCO range tuned to 1966.08MHz. Therefore, it cannot generate the clock needed by the DAC. In your system design, you may use the LMK04821 with the correct VCO range to generate the clock needed for the DAC.

    -Kang
  • 0 in reply to Kang Hsia
    Prodigy 100 points

    Kang,

    Many thanx for suggestion. Is it enough to only change reference clock to external? I mean, have I make any other changes in DAC control software respect to the case when DAC clock Fdata = 983.04MHz?

    .

  • 0 in reply to Alexander Lozhkin
    TI__Guru* 78594 points
    Hi Alexander,

    This step should be enough. The automated script will configure the rest.

    -Kang