A-D converter, A-D convert method, and A-D convert program

摘要

There is provided an A-D converter that outputs a digital output signal obtained by digitalizing an analog input signal. The converter includes a plurality of comparators that each compares the analog input signal and an analog threshold value according to designated digital threshold data, a high-order field determining section that narrows down a data value corresponding to a high-order field of a predetermined bit number in the digital output signal based on a plurality of comparison results obtained by supplying threshold data different from one another to the plurality of comparators, a low-order field computing section that computes a plurality of candidate values for a data value corresponding to a low-order field of a predetermined bit number located at a side lower than the high-order field by means of the plurality of comparators, and a low-order field determining section that determines a data value corresponding to the low-order field based on the plurality of candidate values.