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光电耦合器具有很强的抗干扰能力，在微机控制的数据采集系统中，光电耦合器所处的位置对系统的性能有直接的影响。本文阐述了光电耦合器位于A／D转换器之后和之前两种方案的特点、存在的问题及解决问题的办法；最后指出，为了适应A／D转换器和CPU等功能模块集成在一块芯片上这一微处理机的现状和发展趋势，应该认真研究和更多地采用将光电耦合器放在A／D转换器之前这种方案。
Optocoupler has a strong anti-interference ability, in the computer-controlled data acquisition system, the location of optocouplers have a direct impact on the performance of the system. This paper describes the optocoupler in the A / D converter after the two programs before and after the characteristics of the problems and solutions; finally pointed out that in order to adapt to A / D converter and CPU and other functional modules integrated in a chip The status quo and development trend of this microprocessor, should seriously study and more use optocoupler before the A / D converter this program.