| 摘要 |
PURPOSE:To facilitate a correction of the gain for a digital-analog converter as a whole, by controlling the overall gain on the basis of the output corresponding to the set value of said converter. CONSTITUTION:An analog input signal SI is led into a channel 1 of a multiplexer MPX, and the reference voltages EV1 and EV2 are supplied to the channels 2 and 3. The output signal SXO which is selected with switching by the multiplexer MPX is fed to an arithmetic processing part CPU via an A/D converter CAD. The output SCR is led out via a D/A converter CDA and output driving parts DR1 and DR2 and also led into the multiplexer MPX. Then the gain of the whole converter is controlled through the part CPU on the basis of the input and output obtained when the voltages EV1 and EV2 are selected by switching. |
