A capacitance-to-digital converter, comprising - a capacitor arrangement comprising an input capacitor, - a converter that is coupled on its input side to the capacitor arrangement and - a calibration unit that is coupled on its input side to the converter, wherein the converter comprises an interface circuit that is coupled on its input side to the capacitor arrangement and comprises a first integrator having a first amplifier as well as a first and a second integrating capacitor (51, 52), wherein the capacitor arrangement is directly connected to a first terminal of the first integrating capacitor and to a first terminal of the second integrating capacitor, wherein the interface circuit comprises an input chopping unit, and wherein a first and a second input (53, 55) of the first amplifier is coupled to the capacitor arrangement, to the first terminal of the first integrating capacitor and to the first terminal of the second integrating capacitor via the input chopping unit, characterized in that the capacitor arrangement comprises a reference capacitor and a first to a fourth changeover switch (36, 39, 41, 42), wherein a first terminal of the input capacitor is connected via the first changeover switch to a positive voltage source and to a negative voltage source, and a second terminal of the input capacitor is coupled via the second changeover switch either to a first input of the input chopping unit or to a ground terminal, and wherein a first terminal of the reference capacitor is coupled via the third changeover switch to the positive and the negative voltage source (37, 38), and a second terminal of the reference capacitor is coupled via the fourth changeover switch either to a second input of the input chopping unit or to the ground terminal. - a capacitor arrangement comprising an input capacitor, - a converter that is coupled on its input side to the capacitor arrangement and - a calibration unit that is coupled on its input side to the converter, wherein the converter comprises an interface circuit that is coupled on its input side to the capacitor arrangement and comprises a first integrator having a first amplifier as well as a first and a second integrating capacitor (51, 52), wherein the capacitor arrangement is directly connected to a first terminal of the first integrating capacitor and to a first terminal of the second integrating capacitor, wherein the interface circuit comprises an input chopping unit, and wherein a first and a second input (53, 55) of the first amplifier is coupled to the capacitor arrangement, to the first terminal of the first integrating capacitor and to the first terminal of the second integrating capacitor via the input chopping unit, characterized in that the capacitor arrangement comprises a reference capacitor and a first to a fourth changeover switch (36, 39, 41, 42), wherein a first terminal of the input capacitor is connected via the first changeover switch to a positive voltage source and to a negative voltage source, and a second terminal of the input capacitor is coupled via the second changeover switch either to a first input of the input chopping unit or to a ground terminal, and wherein a first terminal of the reference capacitor is coupled via the third changeover switch to the positive and the negative voltage source (37, 38), and a second terminal of the reference capacitor is coupled via the fourth changeover switch either to a second input of the input chopping unit or to the ground terminal.