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Original question:

DAC38RF82: External Reference

DAC38RF82: DAC38RF82

Mohamed Nezami16
Prodigy 10 points
Part Number: DAC38RF82

Dea members, I have a question regarding the clock out signal available on the DAC38RF82. 

Please see the diagram here, and then here is my question,

I want to see how can I get an access to the DAC

Clock signal at ~ 9GHz to use elsewhere for the TX and RX chain.

Is there any way to avoid the /3 minimum on the DAC clock out ?.

I still need to run the ADC at ~3GSPS, and I need the DAC to run at

~9Ghz, What other possible arrangement can I do to obtain this ?



  • 0
    TI__Mastermind 44680 points
    Hi Mohamed
    I have notified the DAC38RFxx expert regarding your question.
    He will provide a more detailed response soon.
    Best regards,
    Jim B
  • 0
    TI__Guru* 91947 points

    Mohamed,

    If you operate the DAC internal PLL at 9GHz, you can use a divide by 3 to generate a 3GHz for the CLKTX output. What DAC clock input frequency are you sending from the LMK? What LMF settings do you plan on using with the DAC? What is your interpolation factor? Are you using IQ data or real? How many DUC's per DAC? All of this will come in to play when determining if you can do this or not based on your available DAC clock frequency from the LMK.

    Regards,

    Jim