DA Converter Working Principle | Block Diagram | Channel Finally there must be some form of gating on the input of the register, such that the F/F’s can be set with the proper information from the digital system. A basic block diagram of a D/A converter is shown in Fig. 17, and a complete block diagram of a 4-bit DA Converter Analog to Digital Converters - Successive Approximation Jun 24, 2011The function of the analog to digital converter is exactly opposite to that of a DIGITAL TO ANALOG CONVERTER. Like a D/A converter, an A/D converter is also specified as 8, 10, 12 or 16 bit. Though there are many types of A/D converters, we will be discussing only about the successive approximation type.