Generally
voltage DAC output will be [0V : +VREF ], where VREF
is the reference voltage to the DAC. But sometime you would like to have a
bipolar signal out of DAC for your use. In this case, you would need to level
shift and scale the signal accordingly. Shown below is a circuit that level shift the DAC output from [0V : +VREF ] to [-VREF : +VREF]
To derive the equation, first is to
identify from y = mx + c, y = vout, x = Gdac. In actual application, when you program DAC to half
its range, Gdac = 0.5, and the number can be
controlled from 0<=Gdac <=1 by changing DAC
data input.
Nice blog… Thanks for sharing very useful information about electrical circuits.
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