| 摘要 |
PURPOSE:To surely reset an output voltage of a D/A converter to zero V at application of power supply by providing a code generating circuit generating an instruction having a code bringing the initial output of the digital/analog converter into zero V. CONSTITUTION:In applying power, a pulse signal is generated from a power-on pulse signal generating circuit 1 and the pulse signal is fed to an FF circuit 2, then an output of the FF circuit 2 si set. Thus, an input terminal B of a data changeover circuit 4 is selected and a data set to a code generating circuit 3 is fed to the D/A converter 5 via the data changeover circuit 4. The data includes a code generating a zero V output after the D/A converter 5 is reset in advance. Thus, in applying power, the initial value of zero V is generated surely from the D/A converter 5.
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