I'm trying to make my ADC as accurate as possible - in the datasheet for the PIC18F2550 it seems to indicate that the Tad value must be as small as possible, and then later there's a table (page 273 https://www.electro-tech-online.com/custompdfs/2010/01/39632e.pdf) that gives the maximum Fosc for each given Tad. I was using a 2 Tad speed with a 8Mhz oscillator speed and yet everything still works... does it really matter what Tad setting I use? Which should I be using?
Also with ADC accuracy, is it more accurate to use the Vref+ and Vref- pins even if all I do is connect the Vdd and Vss rails to them?
Also with ADC accuracy, is it more accurate to use the Vref+ and Vref- pins even if all I do is connect the Vdd and Vss rails to them?