Next: Analog-to-Digital Conversion Up: Digital-to-Analog Conversion Previous: Current Summing and IC

DAC Limitations

The output of a DAC can only assume discrete values. The relationship between the input binary number and the analog output of a perfect DAC is shown in figure 8.3.

 
Figure 8.3:  Output signals from DACs showing a) the ideal result, and b) a differential nonlinearity or c) non-monotonic behavior, both caused by imperfectly matched resistors.

Common DAC limitations are an anomalous step size between adjacent binary numbers, non-monotonic behaviour, or a zero output.



Narippawaj Ngernvijit