| 摘要 |
An A-D converter includes an A-D converter circuit, a D-A converter circuit, a subtraction circuit, a second amplifier circuit, a reference voltage control circuit, a timing control circuit 18 , an amplifier control circuit 19 , and an output circuit. The reference voltage control circuit controls the range of reference voltage in the A-D converter according to a step or stage of conversion in the A-D converter. In particular, the reference voltage control circuit performs a control so that the range of reference voltage in the A-D converter circuit at the time of conversion in the third step is larger than that in the first and the second step.
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