Other Parts Discussed in Thread: LMX2595, , LMK61PD0A2
Hello, I observed a phenomenon that puzzled me.
When my LMX2595's reference signal is set to 125MHz, no matter what output frequency is, there is always a 3.5GHz spurious output (nearly -70dBm), which seems to be higher order harmonics of the reference frequency. I didn't find any specifications about LMX2595 reference frequency spurious or PFD spurious. Is it normal performance of LMX2595?
Also, when I tested LMX2595EVM, using 125MHz reference provided by SMW200A and Reference Pro( LMK61PD0A2), I observed the same phenomenon. It is my TICS Pro setting and the 3.5GHz spur is nearly -75dBm.
When I change reference frequency to 130MHz, the 3.5GHz spurious disappear. It's preliminarily determined that this spurious signal is caused by OSCin or PFD. Can this spurious signal be eliminated or reduced?