Hi,
I have some issues about VCO calibration of lmx2594:
1.My RFout of lmx2594 is 7~8.3GHz,and i do no assist for vco calibration.Does this mean the vco will calibrate automatically when i set Fcal_en=1?And what's the reliablility of it?Does this calibration will change with temperature(-40C~25C~50C) change?If it is does change whether it means the vco unlock?And it maybe need calibration again?
2. For the vco calibration,I see some recommends from the lateset datasheet in table 5 of page 23.And i compared my settings,I found i didn't set the VCO_SEL&vco_daciset_strt&vco_capctrl_strt as the recommends. I chose a frequency point(eg.7671.6Mhz) in the band I used above and then exported the register configuration from TICS as the initialization registers configuration.When i change to other frequencies,I just program N-divider value and PLL numerator and denominator and then program FCAL_EN (R0[3]) = 1.Does this matter?Or I'd better configure the three parts according to your recommendation?
3.If my RFout change to 9~12.3G,did i have to use two initial parameter for vco calibration?One is for 11.9~12.1G,the other is for other frequeny bands.
Regards.