| 摘要 |
PROBLEM TO BE SOLVED: To provide an analog/digital conversion circuit capable of performing high-speed AD conversion even while suppressing an interference of the potential of an analog input that is inputted immediately before. SOLUTION: This analog/digital conversion circuit is provided with a comparator (1) for comparing reference potential with an analog input, a first switch (SW4) for transmitting the analog input to a comparison input line (8) of the comparator (1), a second switch (SW5) for transmitting initialization potential (Vss) to the comparison input line (8) of the comparator (1), and an input control circuit (5) for turning on the second switch (SW5) to initialize the potential of the comparison input line (8) of the comparator (1) into the initialization potential (Vss) during an AD conversion period and the non-operating period of the comparator (1). COPYRIGHT: (C)2005,JPO&NCIPI
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