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模数转换电路是微型机用于测量、控制的重要接口电路。一般常用一块集成电路转换器件与一个运算放大器相配合,组成一个完整的转换电路。图1为一常用D/A转换电路芯片DAC0832与运算放大器组成的模数转换电路。被转换的数字信号由微机的总线D_0～D_7给出,并进入DAC0832数模转换芯片,该芯片将数字信号变成电流信号再经运算放大器变成电压信号而输出,从而实现数模转换。对于化工、热工等一类慢过程的应用来说,往往
A / D conversion circuit is the important interface circuit used by microcomputer to measure and control. Commonly used in an integrated circuit conversion device with an operational amplifier to form a complete conversion circuit. Figure 1 is a commonly used D / A converter circuit chip DAC0832 and operational amplifier composed of analog-digital conversion circuit. The converted digital signal is given by the bus D_0 ~ D_7 of the microcomputer and enters into DAC0832 digital-to-analog converter chip. The chip converts the digital signal into a current signal and then becomes an output voltage signal by an operational amplifier to realize digital-to-analog conversion. For chemical, thermal and other types of slow process applications, often