A semiconductor device includes; a loop filter that receives a differential analog signal and generates a residue signal indicating an error between an analog input signal and an feedback signal, a first ADC that receives the residue signal and generates a first digital representation, a second ADC that receives the analog input signal and generates a second digital representation corresponding to the analog input signal, and a digital to analog converter (DAC) that receives a sum of the first digital representation and the second digital representation and generates the analog feedback signal. At least the first ADC is a multi-bit Successive Approximation Register ADC.