App note: PCB layout for analog to digital converters

NXP provides some PCB layout design guidelines for the ADC modules in their LPC1100 and LPC1300 microcontrollers. These ADC modules, like many microcontrollers, use the power supply voltage as a reference so special care has to be taken to eliminate noise:

The microcontrollers in the LPC1100 and LPC1300 families are all equipped with a single external power supply. The digital (core) and analog parts (ADC/Vref) are all connected to the same external supply. Without precautions, noise produced by the core could influence the readout of the ADC via the internal Vref.

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