| 摘要 |
PURPOSE: To easily provide two transmission functions directly opposite to each other by performing an A/D conversion and a D/A conversion by the same constitution element. CONSTITUTION: The output of a digital-analog D/A converter 110 is connected to an attenuator 120 and the output of the attenuator 120 is connected to the input of a comparison mechanism 150 and a sample-and-hold S/H circuit 130. The output of the S/H circuit 130 supplies an analog amount reacting to digital output transmitted through a bus 115 to control logic 140 to a lead wire 185. Also, the output of the comparison mechanism 150 is sent to the control logic 140 and the control logic 140 controls the S/H circuit 160, the D/A converter 110, the attenuator 120 and the S/H circuit 130 and supplies the digital output corresponding to the analog amount inputted to the S/H circuit 160 to the bus 125. Thus, without using the members of high accuracy, the two transmission functions in completely opposite relation are easily realized. |
