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A DAC accepts a n-bit i/p Nor $d_{n-1} d_{n-2}...d_{1} d_{0}$ in binary and procedure an analog sig. proportional to it. Fig, shows clet symbol & i/p o/p characteristics of a 4-bit DAC. There are 4 digital i/ps . Each digital i/p requires an electrical signal representing either a logical 1 or a logic o.