| 摘要 |
In a D/A conversion apparatus capable of achieving high accuracy formation of output voltage of an analog signal, when data D7 through D0 of 8 bits are inputted to a decoder 4, by a control signal from the decoder 4, a pair of switches connected to both ends of predetermined resistor R0 are selected from respective switches S0A through S255A, S0B through S255B of respective switch groups 3A, 3B of a voltage selecting circuit 3 and simultaneously operated to make ON and the other respective switches are operated to make OFF. Further, voltage across both sides of resistor R0 of a voltage generating circuit 2 connected with the pair of switches operated to make ON is inputted to a differential amplifier 5 and average voltage of the voltage across the both ends of the resistor R0 connected with the switches operated to make ON is outputted from an output terminal 6 as an analog signal.
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