Dear Technical Support Team,
There is a 25MHz on board crystal on CDCI6214EVM.
Could you inform of me about part number of it?
I could find it on User guide.
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That series resistor should be for testing purposes - to figure out the negative resistance by observing when the XTAL stops oscillating after increasing the series resistance. A better way of doing it, though, is to use potentiometer. You don't need any series resistor, because that'll only increase the ESR.