Analog Input Voltage Range

Hi All,

I am working on a project where we are putting a voltage input from a sensor into one of the open input channels. I am curious if anyone knows what the upper limit is for signal voltage on the APM2. I would like to get the largest range possible (I can control the voltage coming out of the sensor) but I assume that the board has a certain range that it can read. 

I will attach the ATMEL ATmega 2560 documentation, but I have scanned through it and cannot find a clear answer. 




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