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数模转换器(DAC)和模数转换器(ADC)是数字化仪表、计算机自动控制设备中的一种关键接口单元,它们的功能是进行模拟量与数字量之间的相互转换。这种单元主要的性能要求是高速和高精度,也就是要有尽可能短的转换建立时间,以及转换结果要尽可能接近数字量和模拟量之间对应的理想的线性关系。因此这种单元对元件本身的精度要求很苛刻,采用分立元件组合成转换器,不仅成本高而且性能不佳。1971年美国PMI公司和Motorola公司发表了单片集成的六位DAC,为转换器的发展开辟了新的前景。最近几年,在国际市场上,八位到十二位的单片的DAC以及八位
Digital-to-analog converters (DACs) and analog-to-digital converters (ADCs) are a key interface unit in digital instrumentation and computer automation equipment. Their function is to convert between analog and digital signals. The main performance requirements for this type of unit are high speed and high accuracy, which means that there is as short a conversion setup time as possible, and the conversion result is as close as possible to the ideal linear relationship between the digital and analog quantities. Therefore, the accuracy of the element itself on the element itself is very harsh, the use of discrete components into a converter, not only high cost and poor performance. In 1971, PMI Corporation of America and Motorola Company published a monolithic integrated six-bit DAC, which opened up a new prospect for the development of the converter. In recent years, in the international market, eight to twelve monolithic DAC and eight