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ADC noise and source impedance

Question asked by john.john.002 on Jul 23, 2016
Latest reply on Jul 24, 2016 by baird.hal.001
Does STM32F103RB use switched capacitor ADC circuit which produces some noise in the process and requiring source impedance to be 'not too high' or else accuracy will degrade? 

The signal is single channel and no MUX switching.