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LMX2491: Device Usage Conditions

Guru 11110 points
Part Number: LMX2491

Tool/software:

Hello,

My customer confirmed that PLL Lock is normal when REF=100MHz, PDF=1MHz, R=100 is set using the LMX2491 board they designed.

However, when REF=100MHz, PDF=100MHz, R=1 is set, PLL Lock is not worked.

Are there any issues with the above conditions under which they use the LMX2491?

Thank you.

JH