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LMX2592EVM: LMX2592 impedance of OSCin

Part Number: LMX2592EVM
Other Parts Discussed in Thread: LMX2592


I check the schematic of LMX2592EVM, the OSCin pin have stuffed external 3 resistance.

Is the function of those resistance for input impedance control?

I have check LMX2592 datasheet, and it point out the looking outward of OSCin pin should close to 50OHM.

May I know why LMX2592EVM design with 18 and 68 OHM?