| 摘要 |
PROBLEM TO BE SOLVED: To provide a D/A converter, the circuit scale of which can be reduced by remarkably reducing the number of elements required for constitution, while securing monotonicity and precision. SOLUTION: R1 to R4 are plural resistors for dividing reference voltage. Switches S0 to D3 are for selecting the divided voltage of the resistors R1 to R4. Switches SP1 and SP2 are for extracting the divided voltage selected by the switch S0 to S4 as positive voltage. Switches SN1 and SN2 are for extracting the divided voltage as negative voltage. A decoder 21 on/off-controls the switches S0 to S4, SP1, SP2, SN1 and SN2 respectively by inputted digital signals D0 to D2.
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