Part Number: LMX2594
Hello TI Experts
I'm struggling with the LMX2594 which at some frequencies sometimes randomly outputs a spur.I have two LMX2594 as LO's in a double superhet receiver. First I thought this was leakage and cross products. However, the problem appears also if I only run the LMX2594 alone (no other components running apart from external refclock).
The following examplifies the issue: I have the LMX2594 set to 7.097GHz with a reference clock of 143.36MHz. The registers I use for programming are attached.
I dump the registers to the device and sometimes the result is with spur at 400kHz offset:
Then after re-programming with the same registerfile the result is without spurs:
Attached also phase noise measurement results: (Please visit the site to view this file)(Please visit the site to view this file)
In both cases the device reports a "Locked" state.
Any help with this issue is very much appreciated!
Registerfile: (decimal)
(Please visit the site to view this file)