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LMX2694-SEP: Input Impedance for Refn pins

Part Number: LMX2694-SEP
Other Parts Discussed in Thread: LMX2594

Tool/software:

Is there any input impedance information on the reference in pins on the LMX-2694-SEP synthesizer?  We are trying to interface it to a differential CMOS  oscillator and need to understand the loading of these pins a bit better.

I don't see an IBIS model for this part but I used the LMX2594 IBIS model as a substitute. After simulation, the input capacitance of the pins at the OSCin inputs appear to be equivalent ~ 0.15pF. Does this seem correct?