Patent ID: 8223045

Claim:
A digital-to-analog converter comprising: a digital-to-analog converter base part including a first digital-to-analog converter unit configured to perform digital-to-analog conversion of high order bits and a second digital-to-analog converter unit configured to perform digital-to-analog conversion of low order bits, the second digital-to-analog converter unit being provided with an auxiliary bit assigned an identical weight to a least significant bit; a correction digital-to-analog converter part configured to adjust a signal outputted from the first digital-to-analog converter unit in the digital-to-analog converter base part; an error detection processing section configured to generate a digital code to be supplied to a correction digital-to-analog converter unit in the correction digital-to-analog converter part; and a control section configured to control the digital-to-analog converter base part, the correction digital-to-analog converter part, and the error detection processing section, wherein the first digital-to-analog converter unit includes first bit current sources whose number is equal to the number of the decoded high order bits, the second digital-to-analog converter unit includes second bit current sources whose number corresponds to a bit number of the low order bits and an auxiliary least significant current source corresponding to the auxiliary bit, and the control section compares a current value of one of the plurality of first bit current sources with a total current value of the second bit current sources in a lower order than the first bit current source, and corrects the current value of the first bit current source by causing the error detection processing section to generate the digital code supplied to the correction digital-to-analog converter unit when judging that the current value of the first bit current source changes.