| 摘要 |
A digital-to-analog conversion circuit capable of preventing a noise produced in a digital system from mixing in an analog output has an input circuit receiving a pulse-code modulated digital signal, a conversion circuit such as a noise shaping circuit for converting the pulse-code modulated digital signal to a pulse wave signal containing analog amplitude information in a time axis direction, a buffer circuit including an electrically insulated coupling circuit such as an optical coupling circuit for transmitting output of the conversion circuit, and an analog output circuit including an analog low-pass filter for delivering out output of the buffer circuit therethrough. A noise generated in a digital system is intercepted by the buffer circuit and is not transmitted further so that mixing of the noise in the analog output circuit is prevented.
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