I have a draw full of LTC 1298 12 bit A/D converters. So at 5.0 volts DC on the input of a channel the A/D give the digital number 4096. Okay so lets say you do see 5.00 volts on the input it seems the basic formula would be INPUT*10 divided by 4096 * 5 which would give 50 or 5.00 volts. However, at an input of 3.71 volts you have an A/D input of 3040. 3040*10= 30400. Now divide by 4096 you get 7.42 and the PIC will only give you the 7 so that 7*5=35 and not the 3.71 volts. So how do you create a formula that is accurate? Do you need to take your A/D reading and divide it or ....???
Thanks in advance, Ed