Patent ID: 7639166

Claim:
A D/A converter circuit that converts an input digital signal comprising a plurality of upper bits and a plurality of lower bits into an analog voltage, comprising: a first resistor string that comprises a plurality of first resistors connected in series and generates a plurality of first analog voltages; a first switching circuit that selects a pair of first analog voltages out of the first analog voltages generated by the first resistor string according to the upper bits; a second resistor string that comprises a plurality of second resistors connected in series, is provided with the pair of first analog voltages as reference voltages and generates a plurality of second analog voltages; and a second switching circuit that selects a pair of second analog voltages out of the second analog voltages generated by the second resistor string according to the lower bits, wherein the selected pair of the first analog voltages is provided to the second resistor string without passing through a buffer, and a resistance of the second resistors is larger than a resistance of the first resistors.