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LMK5B12204: problem with synchronization to ext. signal

Expert 6280 points
Part Number: LMK5B12204

Hello,

we are testing the device with its dedicated EVM (https://www.ti.com/tool/LMK05318BEVM) and experiencing some issues with clock synchronization.

The output is working fine, we are able to generate any frequency and it looks nice. The only problem is that we can't synchronize it with 1s PPS or any other input frequency (from Agilent 33120A function generator).

We also tried with reference 1pps configuration from TICS Pro software, but it still didn't lock.

Do you have any advise what can be the issue?