Digital-to-analog converter

A digital-to-analog converter circuit including a delta-sigma modulator, an adder provided at an signal input stage to add an oscillation-preventing D.C. value to an input signal, and an output buffer provided at a signal output stage, said digital-to-analog converter circuit further comprising:

• a comparator which compares an output from said output buffer with a reference potential level to yield a high-level output signal or low-level output signal;
• an up/down counter to which clock pulses are supplied during a predetermined calibration period when no input data is present and which counts up or counts down the clock pulses in response to the high-level output signal or low-level output signal from said comparator;
• a current source circuit including a plurality of switches and a plurality of current supply sources which selectively supply said output buffer with an offset-adjusting current via said switches;
• and
• an inversion detector which detects an inversion in the output signal from said comparator to thereby latch output data from said up/down counter.