As PIC is 5v I was thinking to transform electrically all sensors to ranges to 0-5v with a "magical IC" that outputs an analog voltaje (not digital) proportional to the input.

For example if a 3,3v device (accelerometer, sensor) outputs 1,65v (50% of 3,3v), then this "magical IC" will recive 1,65v and output 2,5v (50% of 5v).- Aswell if in another channel or other IC configured to transform 0-3v to 0-5v (if sensor says 1,5v my PIC will receive 2,5v). Of course I think this IC should be circuited for matching the desired specific voltaje range

Maybe those "magical" IC's are OpAmps, as dhouston (thx!) commented. Can OpAmps make that function?

"Realtime" processing is critical, so multisampling solution suggested by scalerobotics (thx!)is definitely not an option to my application. Interesting for another app anyway.

And to shrink voltaje as mackrackit suggested (thx!) it would limit "natural" analog resolution. I prefer to amplify a voltaje than shrinking it. And I hope an Operational Amplifier (OpAmp) does that.

So: Can OpAmps make that function?

Thank you very much for your attention !