说明：  在单片机应用系统中，常用到模拟输出，数模D/A转换器（Digital to Analog Converter）是一种能把数字量转换成模拟量的电子器件
(Applications in SCM systems, commonly used to the analog output, digital-to-analog D/A converter (Digital to Analog Converter) is a digital volume can convert analog electronic devices)