| 摘要 |
An A/D conversion circuit includes: a sample-and-hold circuit adapted to sample and hold an input signal to output a sampled signal; a control circuit adapted to output successive approximation data; a first D/A conversion circuit adapted to perform D/A conversion on the successive approximation data to output a first D/A output signal; a second D/A conversion circuit adapted to perform D/A conversion on time-varying code data to output a second D/A output signal; and a comparison circuit adapted to perform a process of comparing the first D/A output signal, and an addition signal of the sampled signal and the second D/A output signal, and to output a comparison result signal, wherein the control circuit has a successive approximation register to which register values are set in accordance with the comparison result signal, outputs successive approximation result data after all of the register values of the successive approximation register have been determined, and subtracts the code data from the successive approximation result data to output the result as A/D conversion data of the input signal.
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