Relation between VDIG and VDD of HMC920

Hi,

I am using HMC920 to bias HMC863ALC4.

Queries:

1)In HM920 what is the relation  between VDD and VDIG?

2) Do I need to apply voltage to VDIG as below?


3) Is there a reference circuit for the connection of HMC920 and HMC863ALC4?