we use LMX2492 + CHC2442 to generate 24G source signal, originally, 40MHz TCXO feeding to LMX2492, they works well for 24GHz source signal generation. However, when we switch to 100MHz VCXO feeding to LMX2492， they could not functionally be operating that the output signal is unlocked. For debugging, we use SG as OSCin, it is found that OSCin frequency less than 80MHz, they could work well, but LMX2492 could not lock the output when OSCin frequency is higher than 80MHz. we use TI official software tool for LMX2492 configuration， it should be OK for REGs setup. on datasheet, LMX2492 OSCin could be lower than 600MHz, so what's the problem of our case. REGs OK, 100MHz OSCin, but LMX2492 could not lock the output, while works well when OSCin below 80MHz. since it is a urgent case, would you please present us solution as soon as possible, thanks in advance.
