PURPOSE: A WCDAC(Weighted Capacitor Digital-To-Analog Converter) using a charge sharing technique is provided to ensure a reduced chip area by reducing the size of a capacitor at the time of design of the WCDAC. CONSTITUTION: A WCDAC comprises an electric charge-non sharing charge unit(110), an electric charge-sharing charge unit(120), and an output unit(130). The electric charge-non sharing charge unit converts upper bits of digital data into analogue data. The electric charge-sharing charge unit is charged with electric charges corresponding to the data amount of the upper bits for the digital-to-analogue conversion. The electric charge-non sharing charge unit outputs the charged electric charges to the output unit. The electric charge-sharing charge unit converts lower bits of the digital data into analogue data. The output unit outputs the analog signal corresponding to the digital data based on the electric charges outputted the electric charge-non sharing charge unit.
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