The present invention provides an analog signal generator capable of simultaneously improving both items of the influence of noise on a peripheral circuit and the settling time for a desired voltage level. A D/A converter to which the analog signal generator is applied, is configured as follows. A controller supplies a fixed value to data generation units, which respectively generate data according to clock signals and output the same to a buffer unit. The buffer unit temporarily holds the data therein. Control signals generated from the controller are supplied to a selection unit or selector, which decodes the control signals and thereby generates selection signals to turn ON/OFF the output of the data held in the buffer unit in response to the selection signals, after which the corresponding data is supplied to a filter unit, where an analog signal is generated based on the data supplied to the filter unit.