| 摘要 |
PROBLEM TO BE SOLVED: To provide an A-D convert apparatus capable of reducing noise, and to provide a control method. SOLUTION: The A-D convert apparatus includes a differential amplifier that generates a differential input voltage according to an analog input signal, a differential D-A converter of a charge redistribution type, which outputs a differential output voltage obtained by subtracting the differential input voltage from a differential comparison voltage in accordance with comparison data, a comparator that compares a positive output voltage with a negative output voltage in the differential output voltage, a control section that identifies comparison data at which the differential output voltage becomes substantially zero based on a comparison result of the comparator, and outputs the identified comparison data as output data, and a setting section that sets at least one of a common potential of the differential amplifier and a common potential of the differential D-A converter according to a targeted value of a common potential of the comparator. COPYRIGHT: (C)2011,JPO&INPIT |
