May I ask you a question about HMC529LP5 ? I use your company's IC ADF4158 , AD711 and HMC529LP5 to form a PLL architecture. I use HMC529LP5's pin 4 ( RFOUT/4 ) to feedback to ADF4158, and use pin 19 ( RFOUT ) to feed in my RFIC's LO.
But I will not use pin 12 ( RFOUT/2 ) . How should i do to this pin ? Does it need to connect to RF/DC ground or just not connect anything ?
You should terminate the unused RFOUT/2 port into 50 ohms to ground.