Importance

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Abstract

A successive-approximation type A/D conversion circuit includes: a selection signal input terminal that receives a selection signal; a clock input terminal that receives a clock signal; a main circuit that generates digital data in synchronization with the clock signal during an active period; a data output terminal; a data output circuit that outputs the digital data as a serial signal from the data output terminal during the active period; and a level adjustment circuit. The data output circuit outputs the serial signal by setting a signal level of the data output terminal to a first level and setting the signal level to the first level or a second level during the active period. When the signal level has the second level at the time of switching from the active period to a non-active period, the level adjustment circuit changes the signal level from the second level to the first level.

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First Claim