Patent ID: 8378863

Claim:
An analog-to-digital (AD) converter device, comprising: a capacitive digital-to-analog converter (DAC) including a reference capacitor group having a plurality of capacitors which are weighted with a ratio, and to store an analog input signal applied at a sampling time, one terminal of each of the plurality of capacitors being coupled to a common signal line, the other terminal of each of the plurality of capacitors being coupled to at least one of a plurality of reference power supplies via at least one of a plurality of switches; a comparator to compare a voltage of the common signal line with a reference voltage; a successive approximation routine circuit to control the plurality of switches based on a comparison result of the comparator; an offset correction circuit to correct an offset of the comparator; and a DAC correction circuit to correct an error in a voltage change of the common signal line, the offset correction circuit and the DAC correction circuit to perform a correction so that a residual offset of the comparator and a residual error of the capacitive DAC cancel each other.