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spice model

Hello everyone

In my project I have to build an LVDT including its signal conditioner circuit. I have recently found on the internet that one can build an LVDT using  a very inexpensive signal conditioner circuit which includes components such as ADA2200, ADG794 and AD7192. Bevore ordering these components I would like to simulate the circuit just to make sure its performance does meet my requirment. Unfortunatelly I could not found any  spice models for these components  (ADA2200, ADG794 and AD7192). Does anyone has any Idea what I should do in this case ?

Best regard