| 摘要 |
PROBLEM TO BE SOLVED: To provide an analog signal output device which can control analog reference voltage for an A/D converter, and an output level of an analog input signal according to breakdown voltage of the A/D converter. SOLUTION: A reference voltage generation circuit 10 outputs reference voltage which becomes analog reference voltage of the A/D converter 3. An analog output 20 outputs an analog signal which becomes an analog input signal of the A/D converter 3. A level switch 11 controls the output level of the reference voltage outputted by the reference voltage generation circuit 10 based on a level switching control signal inputted from an external part. A level switch 21 controls the output level of the analog signal outputted from the analog output 20. At this time, the variation rate of an output level of the reference voltage by a control of the level switch 11 according to the level switching control signal, and the variation rate of the output level of the analog signal by the control of the level switch 21 according to the level switching control signal, are the same. COPYRIGHT: (C)2006,JPO&NCIPI
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