A method for indirect conversion of a voltage value to a digital word consisting of sampling an input voltage through a parallel connection of a sampling capacitor to a source of the input voltage, and next of mapping a sample value of the input voltage to a time interval, and of assigning a corresponding value of a n-bit output digital word using a control module wherein the time interval is mapped to a difference of a length of a reference time interval and a length of a signal time interval, wherein the reference time interval is generated starting at an instant (t 1) when the beginning of the time interval is detected using the control module, and the signal time interval is generated starting at an instant (t 2) when the end of the time interval is detected using the control module, wherein the generation of the reference time interval and the signal time interval is terminated at the same instant (t 3) and the generation of the time interval using the control module begins at an instant of detection of an active state on a trigger input (Trg) by the use of the control module, and is realized through charging a sampling capacitor (C n) by the use of a signal current source (Is) in a sampling module and the generation of the reference time interval is realized by charging a subset of an ordered set of capacitors by the use of a reference current source (I R), wherein a first reference capacitor (C n-1) having the highest capacitance among the capacitors in the set of capacitors is selected by the use of the control module from the ordered set of capacitors, comprising indexed capacitors (C n-1, C n-2,..., C 1, C 0), such that the capacitance of a capacitor of a given index is twice as high as the capacitance of a capacitor of the previous index, wherein the first reference capacitor is charged until the reference voltage (U R) increasing on the first reference capacitor and compared to the threshold voltage (U TH) by the use of the reference comparator (K R) equals the threshold voltage (U TH), and then a first cycle is started during which a next reference capacitor in the set of capacitors is started to be charged wherein said next reference capacitor has the highest capacitance among the capacitors that have not been charged yet, and the reference voltage (U R) increasing on this next reference capacitor is compared to the threshold voltage (U TH) by the use of the reference comparator (K R), and the first cycle is repeated, wherein the generation of the signal time interval is realized by charging a subset of the ordered set of capacitors by the use of the signal current source (Is), wherein a first signal capacitor selected by the use of the control module from the set of capacitors has the highest capacitance among the capacitors that have not been charged yet, and the selected first signal capacitor is charged until the signal voltage (Us) increasing on this first signal capacitor and compared to the threshold voltage (U TH) by the use of the signal comparator (Ks) equals the threshold voltage (U TH), and then a second cycle is started wherein a next signal capacitor in the set of capacitors is started to be charged by the use of the signal current source (Is) while this next signal capacitor is selected in the same way as the first signal capacitor and the cycle is repeated, and the generation of the reference time interval and the generation of the signal time interval are terminated while the capacitor (Co) of the lowest capacitance in the set of capacitors is being charged, and when the reference voltage (U R) increasing on a capacitor charged by the use of the reference current source (I R), or when the signal voltage (U S) increasing on a capacitor charged by the use of the signal current source (Is) equals the threshold voltage (U TH).