Avago HSMP-481x diode into ADS

I want to use HSMP-481x diode in my variable attenuator circuit. Can anyone give me the requiered parameters to use it in the ADS? Can I use the PIN-Diode model which are available in ADS or I have to use the diode package? I f I have to use the diode package then I need a package schematic for HSMP-481x. Can some one give me a schematic for that?

Thanks,
Imran