hallo,
i am testing the LMX2592 with the following conditions:
frefin=100MHz; Fpdf=6.25MHz, Fout = 3.0GHz ... 5.0GHz with ACAL_FAST=1 and FCAL_FAST=1; Auto calibration (no VCO start settings and no manual Amp.settings)
The PLL works fine with an aprox. Locktime of 600us. But near Fout of 4.4GHz (aprox. 4.3GHz...4.5GHz) there are several frequency (band) settings, which can not be locked (LD-Out do not goes high) and no output signal can be seen on RFoutA.
Over and below this band the PLL works well. I have tried out several settings.
With FCAL_FAST=0 this frequencies are locked but the Locktime increases 2 to 4 times than in FAST-Mode.
In the datasheet i can not find any settings corresponding to this problem.
Do you have some idea to lock all the frequencies in FAST-Mode?
best regards
Eddi