A Digital to Analog Converter(DAC) performs the task of converting digital words of n bits into voltages whose amplitude will be proportional to the value of the code expressed by the words themselves. Since the input binary words represent a succession of finite codes, the voltage coming out of a DAC cannot be continuous over time but is made up of as many levels as the converted codes are. This means that the devices to which the analog signal produced by a DAC is sent must filter it with a low-pass characteristic (integrating action). The operating criterion of a DAC is simple: in fact, it is sufficient to have a succession of as many voltages as there are convertible codes, obtained for example by means of a weighted resistance network (i.e. t ...
