A / d - (analogous to that of - digital) - converter with:– a pulse delay circuit, which can be driven in such a way that it is activated, in order to start to transmit a pulse signal, and a plurality of delay units as a successive delay stages in a ring delay lines configuration are connected in series, whereby the pulse signal of each of the delay units with the same amount of delay is delayed and the amount of delay in accordance with a voltage level of an analog input signal changes,– a rotation number counting circuit for counting a number of complete revolutions of the pulse signal in the pulse delay circuit, and– a sampling clock signal is supplied by an externally controlled locking - a predetermined sampling period and coding circuit for the registration of respective of the delay units of the pulse delay circuit and the revolution number counting circuit output signals generated at each of respective sampling times is defined by the sampling clock signal in order to thereby provide a total number of since the start of the activation of the pulse delay circuit of the pulse signal to be traversed delay units, and for the production of an a / d - converted output value in accordance with the total number; wherein..
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