In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Sparks-R-Fun wrote:

I am using the analog input circuit and code from the SX/B help file for the 8-bit ADC example.  Currently I am obtaining values of 0-255 between roughly 2.0 to 4.5 volts running at 4MHz.  I wish to obtain near linear readings across the full 0-5V range.  

   I assume that since I am using the built in comparator I should be able to distinguish voltage changes rail to rail.  If so, what things should I consider\examine to help spread the 0-255 input reading across the entire 0-5V range?

- Sparks



P.S.  The real circuit will be measuring 0-10V.  I am planning to use a voltage divider to lower it to the 0-5V range.  Right now all testing is with 0-5V.

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