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一、前言目前,A/D转换器随着速度及精度的提高,价格愈趋昂贵,给实际应用带来困难。但在某些场合被测信号的变化是缓慢的,这时转换速度就不成为主要问题。此时,可以采用低速的双积分式A/D芯片,如ICL135(国产型号5G 7135)是4(1/2)位,分辨率为l/40000,精度相当于14位二进制的A/D转换器;MC14433(国产型号5 G14433)是3(1/2)位,分辨率为5/10000的A/D转换器。5G7135与5G14433都采用双斜率工作方式,所以具有很高的抗工
First, the preface At present, A / D converter with the speed and accuracy increase, the price is more expensive, practical difficulties. However, in some cases the measured signal changes slowly, then the conversion speed is not a major problem. At this point, you can use low-speed dual-integrated A / D chip, such as the ICL135 (domestic model 5G 7135) is 4 (1/2) bit resolution of l / 40000, the accuracy of the equivalent of 14-bit binary A / D conversion ; MC14433 (domestic model 5 G14433) is 3 (1/2) bit, resolution 5/10000 A / D converter. 5G7135 and 5G14433 are dual-slope mode of operation, it has a high resistance