| 摘要 |
Provided is an analog-digital converter circuit having a normal mode for converting a received analog signal into a digital signal, and a calibration mode for adjusting an offset voltage of a comparator, the analog-digital converter including: a first comparator having a first analog signal input terminal supplied with an analog signal, and a first reference signal input terminal supplied with a first reference signal, in the normal mode; and a first calibration circuit that adjusts an offset voltage of the first comparator. In the calibration mode, assuming that a calibration resolution of the first calibration circuit is &Dgr;1, a potential difference between a reference signal supplied to the first analog signal input terminal and a reference signal supplied to the first reference signal input terminal is n1&Dgr;1+&Dgr;1/2 (where n1 is an integer).
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