| 摘要 |
PROBLEM TO BE SOLVED: To provide a reference voltage generating circuit to which a voltage dividing resistance for dividing a reference voltage is connected, capable of outputting a highly accurate divided voltage, and reduced in limitation on an arrangement or a dimension while suppressing the current consumption of resistance during a static period, and to provide an A-D converter and a D-A converter using the same. SOLUTION: The reference voltage generating circuit 11 comprises a reference voltage source 12 for outputting a voltage V1 and a buffer 13, and outputs the reference voltage VREF. A ladder resistance 14 is connected to the reference voltage VREF. A divided voltage output of the ladder resistance 14 is inputted to a comparator part 15, and a comparison result with an input voltage VIN is outputted as output signals S1-SN. The buffer 13 is controlled by a signal SLEEP. When the signal SLEEP is turned off, the reference voltage VREF equivalent to the voltage V1 is outputted and the comparator part 15 is operated. When the signal SLEEP is turned on, the reference voltage VREF is lowered and the comparator part 15 is stopped. COPYRIGHT: (C)2009,JPO&INPIT
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