Patent ID: 7250889

Claim:
A digital-to-analog (D/A) converter comprising: a voltage generator using voltage drops in resistors to generate a plurality of reference voltages forming a monotonic sequence of voltage levels; a first control circuit for selecting an arbitrary one of the plurality of reference voltages as a first output; a second control circuit for selecting another one of the plurality of reference voltages, adjacent in the monotonic sequence to the one of the plurality of reference voltages selected by the first control circuit, as a second output; and a third control circuit for generating a third output from the first output and the second output by voltage division, having a first resistor connected to the first output, a second resistor connected to the second output, an intermediate circuit including at least one third resistor and at least one transistor connected in series with each other and in series with the first resistor and the second resistor, the intermediate circuit being inserted between the first resistor and the second resistor to adjust the voltage division ratio, and a switching circuit connected in parallel with the intermediate circuit between the first resistor and the second resistor, the switching circuit including an output terminal at which the third output is obtained, a first switch inserted between the output terminal and the first resistor, and a second switch inserted between the output terminal and the second resistor.