switches electronic model


   ADI do not provide spice model for switch ADG5412. But the "off isolaltion" characteristic of ADG5412 is a main problem that exist in my design. So I want to do some simluation about ADG5412.  I have a few question that need to be answered first before my simulation.

(1) When the switch is in off state,  there are parameters Cd(Off),Cs(Off). What does Cd and Cs stand for? what is the capacitance bewteen

Drain and Source? Is the Cds equal to the sum of Cd and Cs?

(2) What is the electronic model when the switch is in off state? If we assume off resistance is infinite, can we think that the electronic model of the switch is a capacitance with value equal to  Cds?