Above are correct. But another important point is that both VXCO and PLLs are extremely sensitive to power supply noise and variations. Hence these pins are brought out separately and MUST be provided with well filtered clean and very stable voltages. You may find that the grounds for these circuits are also brought out separately, and the same cautions apply.
Typically you'd have a separate small IC linear regulator just for these rails, with R-C or L-C low pass isolation from everything else on the board. And they'd better be as close to the chip as possible, AND use their own RF-isolated ground plane segment.