We are using the LMX2595 on multiple platforms and have found that the Lock Detect output from the MUX pin (LD_TYPE=1) can report false lock transitions when the REFin oscilaltor is removed. Some devices don't do it, some devices do it very regularly. We have two evaluation boards and one of them does it very badly.
We have found that reducing the state machine clock frequency (CAL_CLK_DIV = 3) and adding maximum LD_DLY value of 65535 improve the situation, but do not resolve it fully.
Is there a way to stop the lock detect reporting false sporadic locked status when the input reference clock is removed ?