At 2200Mhz I noticed that my Vtune is hovering below 1V in most of our units. Specs however on p3 showed minimum of 1.25V and Figure 14 on p10 is never close to 1V.
Is the above condition possible? What possibly contribute to this condition?
Check the VCO core current. It should be set to 15 mA.
Using a non-specified VCO core power current changes the VCO vs. frequency characteristic completely.
Only the specified VCO core power current should be used for the ADF4360-x family, in this case 15 mA.
Core current is 5mA. Can you elaborate on how this would affect the Vtune voltage / VCO core?
I've tried all VCO core power settings (5mA, 10mA, 15mA, and 20mA). Vtune did not change. Any other thoughts?