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Table of Contents. Analog circuits are circuits dealing with signals free to vary from zero to full power supply voltage. This stands in contrast to digital circuits, which almost exclusively employ âall or nothingâ signals: voltages restricted to values of zero and full supply voltage, with no valid state in between those extreme limits.
Re: DAC and ADC ADC: Analog to Digital Converter, its a circuit (device) used to convert analog signals to digital ones with a given percision, eg. A 4 bit ADC will convert from 0 - 5 Volts analog to a digital number ranging from 0000 to 1111 depending on your configuration. DAC: The Opposite, it will convert a digital signal to an analog signal, eg. If I want voltage between 0 and 12 V from a 4 bit ADC, I may configure 1111 to be 12 V, 0000 to be 0 V. You can make one like this using Op-Amps. Why: ADC's and DAC's are used much in control and data aquisition applications.