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LMK03328: How to configure the un-used reference input

user4779049
Expert 2345 points
Part Number: LMK03328

Hi Team,

Please advise me on a question on a question, “how un-used reference input pins are configured?”

The datasheet states that “the non-driven input pin should be pulled-down to ground”.
Does it mean that both positive and negative reference input should be pulled down to GND or
Either of the differential input must be pulled low?

Mita

  • 0
    TI__Expert 4415 points
    Hi Mita-san,

    That statement only applies for LVCMOS inputs. The datasheet states, "For LVCMOS input, the non-driven input pin should be pulled-down to
    ground."

    For unused differential inputs, the unused input can be left floating since there is internal termination. Also, it is recommended to disable the Primary / Secondary input buffer by setting PRIBUFSEL / SECBUFSEL = 11b. This will also save about 10 mA current (per buffer).

    Regards,
    -Tim
  • 0 in reply to Tim Chao Li
    Expert 2345 points

    Tim-san,

    Thank you for the answer.

    Mita