| 摘要 |
PURPOSE:To execute D/A conversion with high accuracy by one D/A converter, by providing a D/A converter corresponding to the number of bits of half of a data value of a digital value, a sample holding circuit, a voltage dividing circuit, and an adding circuit. CONSTITUTION:A high-order bit data value of a digital value outputted from an outputting circuit 21 is D/A-converted by a D/A converter 22. A converted analog value is stored temporarily a sample holding circuit 23. Subsequently, a low-order bit data value of the remaining digital value is outputted from the outputting circuit 21 and given to the D/A converter 22. The converted analog value is voltage-divided by a voltage dividing circuit 24 in accordance with weight of the digital value. This voltage-divided analog value and the analog value stored in the sample holding circuit 23 are added by an adding circuit 25. In this way, D/A conversion can be executed with high accuracy by one D/A converter. |
