| 摘要 |
PROBLEM TO BE SOLVED: To provide an AD conversion method of which the resolution is enhanced without increasing occupied area. SOLUTION: In a step S1, an analog signal AN is inputted. In a step S2, high potential and low potential to be inputted in a DA converter are selected, respectively. In a step S3, the first AD conversion of the analog signal AN is performed. In a step S4, a voltage range is narrowed down by switching the high potential and the low potential, respectively based on conversion data of the first AD conversion. In a step S5, the second AD conversion of the analog signal AN is performed. In a step S6, the conversion data of the first AD conversion and the conversion data of the second AD conversion are collectively outputted as one digital signal. COPYRIGHT: (C)2005,JPO&NCIPI
|
