1) Writing output frequency by the software, it can't respond correctly. The VCO has output frequency but its frequency is fixed and uncontrolled. However, the functions of output amplitude, frequency division and frequency doubling are all normal.
2) Using the raw register function of the TICS Pro software to read back the register value but it is not equal to the value we wrote and is always 0x0000.
3) To verify whether the VCO is malfunctioning, we disconnect CPout and try to directly input Vtune voltage to control the output frequency of the VCO, but the VCO does not respond correctly.
4)We cannot find the control range of Vtune voltage with the VCO on Datasheet. If we want to design an external loop filter by ourself, we need relevant parameters.
