Patent ID: 7330380

Claim:
A digital-to-analog (D/A) conversion device, used to covert a digital input data into an analog output data, the D/A conversion device comprising: a data-latch unit, having an input terminal, a first output terminal and a second output terminal, the data-latch unit is used to receive the digital input data from the input terminal and to latch the digital input data and output the latched data from the first output terminal during a second period, and to latch the digital input data and output the latched data from the second output terminal during a first period, wherein the output voltage level of the data-latch unit is between a first voltage and a second voltage; a first switch, the first terminal of the first switch being coupled to the first output terminal of the data-latch unit, so as to keep the first terminal and the second terminal of the first switch disconnected during the first period, and to keep the first terminal and the second terminal connected to send the latched data to the second terminal of the first switch during the second period; a second switch, the first terminal of the second switch being coupled to the second output terminal of the data-latch unit, so as to keep the first terminal and the second terminal of the second switch disconnected during the second period, and to keep the first terminal and the second terminal connected to send the latched data to the second terminal of the second switch during the first period; a D/A conversion unit, the input terminal of the D/A conversion unit being coupled to the second terminals of the first switch and the second switch, so as to receive the latched digital data outputted from the data-latch unit, and output a corresponding analog voltage from the output terminal of the D/A conversion unit, wherein the level of the analog voltage is between a third voltage and a fourth voltage; and a gain amplifier, the input terminal of the gain amplifier being coupled to the output terminal of the D/A conversion unit, so as to amplify the analog input voltage and generate the analog output data from the output terminal of the gain amplifier, wherein the voltage level of the analog output data is between a fifth voltage and a sixth voltage.