how many max input voltage on 51822 ADC pins
You will find the answer in the nRF51822 product specifications.
(There's no "ADC pin" as such, since all pins can be reconfigured.)
Just want to clarify that the ADC pins (0-7) is actually not assignable. As opposed to all the digital modules, the analog functionality is connected to a fixed set of pins. Look for AIN0-AIN7 in the pin function tables in the Product Specification.
Sorry, missed that. Thanks.
