| 摘要 |
A DAC includes a DAC unit that selects one of a plurality of selection voltages according to an input digital signal, and outputs the selected selection voltage as an analog signal, a first power-supply voltage terminal through which a first power-supply voltage is supplied to a first terminal of a transistor constituting the DAC unit upon power-up of the DAC unit, and a voltage supply control unit that detects a potential difference between the first power-supply voltage and a second voltage used to generate the selection voltages, outputs a voltage corresponding to the first power-supply voltage to a second terminal of the transistor constituting the DAC unit when the potential difference is larger than a predetermined value, and outputs a voltage corresponding to the second voltage to the second terminal of the transistor constituting the DAC unit when the potential difference is smaller than the predetermined value. |
