This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DAC38J84EVM: SerDes Linerate

Part Number: DAC38J84EVM
Other Parts Discussed in Thread: DAC38J82, LMK04832

HI Jim,

Is there any way I can force a different Linerate when the LMFS still the same? I am using LMFS=2221 and I would like to force the GUI to Linerate =3200 Mbps. The FPGA Clock , I would like to work with is 80MHz and the DAC Output Rate would be 1280MHz. The DAC Data Input Rate would be 284.44444MHZ.

  • Yaron,

    This would require an interpolation factor of 4.5 which this part cannot do.

    Regards,

    Jim

  • Hi Jim,

    On my real PCB I have LMK04832 connected to DAC38J82. Do U see any problem with using  LMFS=2221 at Linerate =3200 Mbps,   FPGA Clock , I would like to work with -  80MHz and the DAC Output Rate would be 1280MHz. The DAC Data Input Rate would be 284.44444MHz for Interpolation factor of 8 ?

    Thanks alot 

    Yaron

  • Yaron,

    The DAC input rate =(DAC output rate divided by Interpolation factor. If you want to use interpolate by 8, either your DAC input data rate or DAC sample rate will have to change. You cannot use 1280MHz and 284.444MHz with 8x interpolation.

    Regards,

    Jim