I know a lot of people like to search Digikey (or Mouser) for new parts... but please just use the manufacturer website. Digikey doesn't always carry every part, and their categorization is usually a bit messed up.
As an aside, AD has a large number of parts which are non-public. You will not find the part numbers (or any information about them) without an NDA and personal assistance from an AD rep.
As an aside, AD has a large number of parts which are non-public. You will not find the part numbers (or any information about them) without an NDA and personal assistance from an AD rep.