I have the DDC114 Development board and I have some custom software I wrote that can plug in and talk to the DDC114 and get readings. Using the development board I get very good results in both test mode and not in test mode. In test mode using the 3 pF cap I am seeing around 30 counts of noise, which is about what I expect.
I also have a board that was designed and layed out by my company that I can plug in exactly the same way and use the same software to talk to the DDC. But on this board I am getting around 100 counts of noise. The board was designed very similar to the dev board and careful consideration of routing and sheilding was observed in the layout.
What are some tips or things to make sure we are doing correctly to get our noise levels down there? Thank you.