| 摘要 |
A sequential conversion-type A/D converter having a fixing bit register for identifying which bits of a sequential conversion register are to be fixed, a fixed value register for holding the binary values of the bits of the sequential conversion register to be fixed, and a conversion start position setting circuit for identifying a leading bit of the sequential conversion register as a bit of a lower order than the bits of said sequential conversion register to be fixed. The control circuit starts sequential conversion from the bit set by the conversion start position setting circuit. The invention achieves a sequential conversion type A/D converter which can convert, in a shorter period of time than the prior art, analog input signals showing small changes, without deteriorating conversion accuracy.
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