I am designing my first ever analog to digital board (USB) and have run into multiple problems trying to gain a handle on sources of noise. Recently I discovered that the DC/DC converter I am using (C&D Technologies NMH0512SC) was a source of noise. This part takes +5V and outputs +12 and -12V. I have been told either to change the DC/DC I am using or filter the outputs of the current DC/DC mentioned above.
Of course there are other sources of noise within my circuit that I will get to later but I am focusing on the DC/DC portion of it right now. All help on this subject is welcome.