Iq demod Simulation in ADS

hey I want to simulate IQ demodulator. in ADS. Although I am using AD8347 IC but since models are not available I want to use built in model to complete my simulation. Problem is I am not able to understand configuration for the same. Its IQ_DemodulatorSetup and ask for freq pin_start pin_stop pin_step.
I have no idea what these are for. Also it has just 3 pins RF I and Q what about LO freq? My IC has LO freq RF freq and I and Q as output
thanks in advance reply asap