Please check out the following posts to get you started:
Let me know if you have any questions after looking at these.
Thank You very much by your reply.
OK, after reading it doubts clarified.
I decided to use external 2 channel 5V SPI AD to measure sensor needed (car throttle pedal - analog signals POT1 and POT2 range 0-5V).
Let me know if you have further questions.