When mixing analog and digital circuits on the same board, the board layout and routing can affect the analog noise levels. To ensure accurate sampling of low-level analog signals, it is important to keep noise levels low. Obtaining a well-mixed signal design requires careful hardware considerations. Your software design can also affect the quality of the analog measurements.

Performing a lot of I/O activity at the same time as sampling analog signals causes many digital lines to toggle state at the same time, which might introduce extra noise into the AD converter.

Power debugging will help you investigate interference from digital and power supply lines into the analog parts. Power spikes in the vicinity of AD conversions could be the source of noise and should be investigated. All data presented in the Timeline window is correlated to the executed code. Simply double-clicking on a suspicious power value will bring up the corresponding C source code.