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ADF4360-0 : Frefin below 10MHz ?

hy,

in the data sheet of the ADF4360-0 frefin minimum is mentioned with 10MHz with an advice to couple below 10MHz via DC. I try to use 2MHz TTL-Signal to frefin with the result of large jitter on the R-Out monitored on MUXOut and no lock of the PLL. 

Is it possible to use 2MHz as 3,3V TTL-Signal to frefin?

thanks for hints.

best regards

Eck

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