There is no spice model available for the ADG419.
One option is to use the ADG411 Spice model. The ADG411 is 4 xSPST so you can use 2 channels and tie the outputs together to replicate an SPDT. The ADG411 has the same core switch design as the ADG419…
Can I use 15V/0V for INx pins (Logic Control Input pins) under VDD=15V and VSS=-15V conditions?
Also, ADG411 and ADG1411 can be used same conditions?
Initially looking at your plots what comes to mind is switch charge injection effects. I have attached an FAQ that has some Q&A on glitches caused by charge injection. An experiment to do would be to increase the shunt capacitance on the…