0 pins are on the high power RF circuit board.Input RF type Mixer of the Evaluation board.Using the HMC689 search parameter, you can discover variants of the RF Board.PCB is the one that mounts RF Board.
119916-HMC689LP4 Features
0 pins Mixer Type
119916-HMC689LP4 Applications
There are a lot of Analog Devices Inc. 119916-HMC689LP4 RF Boards applications.