Erik,

I agree that you must take the proper precautions when laying out the PCB (Good ground plane, bypass caps.,etc.). But you can get good results if you take these precautions. Of course, the on board A/D would not be suitable for any high speed data aquisition applications. I have had sucess using the Analog Devices ADuC834 chip. The applications that it was used on were very low frequency, 0-10Hz.

Regards,

Jacob