Successive approximation AD converter and successive approximation AD conversion method
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United States of America Patent
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Apr 21, 2015
Grant Date -
Jul 31, 2014
app pub date -
Jan 23, 2014
filing date -
Jan 25, 2013
priority date (Note) -
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Abstract
A successive approximation AD converter includes a DA converter that converts a higher conversion data greater than an approximate value into an analog higher converted voltage and converts a lower conversion data less than the approximate value into an analog lower converted voltage; a sample-and-hold circuit that samples and holds voltage differences between an input voltage and each of the higher converted voltage and the lower converted voltage; a comparator that outputs a first comparison result indicating whether the input voltage is greater or less than the higher converted voltage and a second comparison result indicating whether the input voltage is greater or less than the lower converted voltage; and an operation unit that changes the approximate value based on the first comparison result and the second comparison result, and changes a next higher conversion data and a next lower conversion data based on the changed approximate value.
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