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LMX2594: Lock time

Expert 4456 points
Part Number: LMX2594

We are having difficulties switching frequency within the allowed switching time for the LMX2594. PLLatinum shows locking time in approximately 180us, but we are seeing 10x that time. 

Is there a feature that slows down the locking time that we can turn off? 

What do you recommend we do to decrease the lock time? 

Thanks,