A delta-sigma analog-to-digital converter generates a digital signal as a function of an analog signal and a clock signal having a first phase and a second phase. The converter includes a first branch that applies an analog input signal, a feedback branch having a digital-to-analog converter that feeds back an analog reference signal, a loop filter, a quantizer, and a switch. The switch includes, and is timely correlated with, an output switch of the digital-to- analog converter. The switch functions to connect an input resistance on the first branch and disconnect the digital-to-analog converter during the first phase, and disconnects the input resistance and connects the digital-to-analog converter during the second phase.