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电子数据处理系统的迅速增长,特别是微处理机市场的迅速扩大,使得能在数字电子计算机和基本上以模拟量为主的真实世界之间起转换作用的接口电路和设备受到普遍关注。A/D(模/数)和D/A(数/模)转换器就是其中两大类特殊的接口器件。就国外七十年代初开始的单片转换器研制的经验而言,它有很多超过对等分立元件转换器的显著优点,设计和制造并不太难。一、D/A转换器基础 D/A转换器,原则上可以认为是一种接受数字编码信号D和模拟基准P为输入,给出模拟输出A的译码器件。模拟输出A和输入的关系是 A=P·D; (1) 这里D是一组位数确定的数字代码,可以表为:
The rapid growth of electronic data processing systems, and in particular the proliferation of microprocessors, has drawn the general attention of interface circuits and devices that are capable of switching between digital electronic computers and the largely analog-based real world. A / D (analog / digital) and D / A (digital / analog) converter is one of two broad categories of special interface devices. For the experience of monolithic converters developed abroad in the early 1970s, it has many significant advantages over peer-to-peer discrete component converters and is not too difficult to design and manufacture. First, D / A converter based on D / A converter, in principle, can be considered as a kind of digital coding to accept the signal D and analog reference P as the input to give the analog output A decoding device. The relationship between analog output A and input is A = P · D; (1) where D is a set of digit-determined numeric codes that can be expressed as: