Content originally posted in LPCWare by Franky on Wed Oct 29 11:21:41 MST 2014
Thanks for your answers LabRat.
The hardware (PCB design) seems to be OK. I tried to wire both uC analog pins (channel4 & channel5) with the same signal, so the c-5 values are OK, but c-4 values are faulty. I even changed the uC but the problem persist. Maybe there is problem in faulty production uC serie or there is some problem in enabled periphery combination.
I run some aditional tests and found out that by reducing reading time (reading time is slower) reduces faulty ADC values on channel 4.