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介绍隔离型高精度D/A转换器的设计方法:由单片机89C52产生PWM,经过光电隔离和一个双RC电路,将数字信号转换为直流电压信号,再经过电压/电流转换电路(V/I),输出0～20 mA电流信号;通过软件校正,达到较高的精度。
Introduced isolation type high-precision D / A converter design method: by the microcontroller 89C52 PWM, optical isolation and a double RC circuit, the digital signal into a DC voltage signal, and then through the voltage / current conversion circuit (V / I) , Output 0 ~ 20 mA current signal; through software calibration, to achieve higher accuracy.