ADC with energy saving scanning
Electronic device for analog to digital conversion using successive approximation, which can be supplied with a unipolar supply voltage, said apparatus comprising: a first analog to digital conversion stage including: a first plurality of capacitors which are coupled to one side at a common node and sampling an input voltage and can either be coupled to a first reference voltage level or a second reference voltage level, wherein at least one capacitor of the first plurality of capacitors may be left floating, wherein a control stage may connect to a floating capacitor in response to a decision taken by a second analog to digital conversion stage analog to digital conversion of decision with the first reference voltage level or the second reference voltage level at least in the the first analog to digital conversion stage can be operated so that the common node is coupled during the analog to digital conversion at a supply voltage level, particularly at ground.