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CDCI6214: LVCMOS input clock

Hiroaki Yuyama TED
Expert 1510 points
Part Number: CDCI6214

Dear, Support Team.

Our customer uses the input clock of CDCI6214 with LVCMOS.
When the input clock is LVCMOS, are the FB_N and REFP/N input pins open?

Best Regards,
Hiroaki Yuyama

  • 0
    TI__Expert 8810 points

    Hi Hiroaki, 

    When using an LVCMOS crystal input on the CDCI6214, only the XOUT/FB_P pin is used and the FB_N and REFP\N pins can be left floating. I've attached a recommended schematic for reference. If you are using a non-crystal LVCMOS source, then REFP can be used instead. Also, note that bit 15 of the INPUT0 register will need to be set to 0 to enable LVCMOS inputs. 

    Regards, 

    Connor

  • 0 in reply to Connor Lewis
    Expert 1510 points

    Hi, Connor-san,
    Thank you for your kind reply.

    I was able to understand the LVCMOS input pin states and register settings.

    Best Regards,
    Hiroaki Yuyama