| 摘要 |
PURPOSE:To attain analog output without reducing resolution even to the request of any full scale voltage by providing a multiplying D/A converter, the 1st and 2nd switches to a digital input data. CONSTITUTION:A switch 8 is connected to the 1st output terminal 21, a contact (a) of the switch 8 is connected to an internal voltage source 4 and a contact (b) is connected to an external terminal 5. Further, the 2nd output terminal 22 is connected to a switch 9, a contact a' of the switch 9 is connected to an inverting input terminal of an operational amplifier 3, and a contact b' is connected to an external terminal 6. In using an analog voltage output, the contacts a' and c' of the switch 9 are connected and in using the reference voltage of the power supply 4, the contacts (a) and (c) of the switch 8 are connected. Further, in requiring a special voltage value as the full scale voltage, the contacts (b) and (c) of the switch 8 are connected and also a voltage source outputting a prescribed voltage value 1 is connected to the terminal 5. |
