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ADS8681EVM-PDK: Simulation of ADS8681 in Keysight ADS

Part Number: ADS8681EVM-PDK

I'm new to mixed-signal simulation in ADS. I would like to simulate ADS8681 with front end RF circuits in Keysight ADS. The IBIS model is the best way to import? I have already imported the model. 

1) There are two models available. ADS8681PW and ADS8681RUM. which model is the best or more accurate? 

2) there are many sets of data available, Typ, Min, Max, Fast, and Slow. how do I know the parameters such as sampling rate and sensitivity of each set of data?

3) the IBIS model after import is shown in the figure below. in is input. what is PC, GC and DigO?

As i'm new to ADC simulation in ADS, any application notes sharing will be very helpful. thanks in advance.