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STM32F103ZG ADC noise

Question asked by parker.terry.002 on Nov 19, 2012
Experiencing a 500Hz 60mVpp on the ADC input. The noise goes away when the processor is in standby or processor is not programmed, but still is biased on. They may be a redundant question from previous posts, but is this likely from not having seperate analog and digital ground planes or something else? The work around was to put a .1Uf cap and 10Kohm resiter on the buffer amp output.