What is the operating frequency of the touch screen for the iPhone?

[CapacitiveT]

I am trying to find the operating frequency for the iPhone 3, 4 & 5 touchscreen controller. Once I find these frequencies I would like to add filtering to my prototype so that these frequency do not interfere with the functionality of the capacitive LCD touch screen.

 

[CWatters]

I couldn't google the info you want but the scanning rate for the touch screen is probably a lot lower than the controller clock rate.