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单片微型计算机在仪器、仪表领域中的广泛应用,使仪器、仪表的信号处理能力日益强大.人们很自然地期望一台基于微处理机的仪器、仪表能够完成多路数据采集和多路控制输出任务.因此,多路数/模转换通道的设计是摆在设计人员面前的一个重要课题.现有的多路数/模转换通道主要采用两种形式:①软件控制单D/A转换器定时循环刷新多路模拟输出通道 在这种形式中,由CPU定时向D/A转换器输出各通道的输出数值,并同时通过多路模拟开关的切换给各通道的保持电容充电以实现多通道模拟输出;
Single-chip microcomputer in the field of instruments, meters, the wide range of applications, so that instrument, instrument signal processing capabilities become increasingly powerful.It is natural to expect a microprocessor-based instrument, the instrument can complete multiple data acquisition and multi-channel control Output task.Therefore, the design of multi-channel digital / analog conversion channel is an important issue in front of designers.Multiple digital / analog conversion channel existing mainly in two forms: ① software control single D / A converter Timed cycle refresh multiple analog output channels In this form, the CPU regularly output to the D / A converter output value of each channel, and at the same time by switching multiple analog switches to each channel holding capacitor to charge in order to achieve multi-channel Analog output