I would like to know how fast the ADG4612 can turn on and off? What happend if 1MHz clock is feed into the INx pin?
I can't find full timing plot data unfortunately. The fastest route here for you to prove out the performance is for you to order an evaluation board and test the performance parameters of the part in own your specific application use case. In addition, I would recommend using a faster Ton switch like the ADG7xx or ADG8xx families if you need really fast transition times.