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CDCE18005: Internal Termination

Ray Vincent Aranzaso
Mastermind 18180 points
Part Number: CDCE18005


Hi,

Good Day.

The customer would like to switch on the internal termination at the primary input in order to have a common mode voltage of 1.2V since they are AC-coupling the clock externally.

Does bit 9, register 5 (PRIINVBB) have to be set to 0 or 1? According to Table 15, need to be set to 0. Is that correct? Please confirm.

Does this result that the VBB voltage being connected to the positive as well as to the negative input pin?

Thank you very much.

Best Regards,

Ray Vincent

  • 0
    TI__Genius 9260 points

    Hi Ray,

    Register 5 bit 9 should be set to 0 if we want to connect VBB to both positive and negative input.

    If we just want to bias negative input, then it should be set to 1. Below diagram shows its working.

    For termination scheme, we can follow Table 15. VBB will be connected to both positive and negative inputs based on configuration in table.

    Best,

    Asim