SOLVED: How can I reduce ADC jitter

[Demon]

Would dual TPS56637 step-down circuits help me reduce noise by PWM, LCD and other "noisy stuff"?




Would diodes help in further isolating the 2 circuits? (like blocking surges) I looking for the minimum voltage for the TPS56637 circuit now, to make sure the voltage drop from 2 diodes wouldn't interfere with 9V input.

I'd use dedicated PICs per function; 1 for input on top circuit, 1 for output on bottom circuit.