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D/A converter without negative voltage

Steph123

Feb 13, 2010
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Feb 13, 2010
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Hi,
I am searching a D/A converter circuit which outputs a voltage without needing a negative supply voltage.
I would like to use the D/A converter AD7524 which uses an R/2R ladder. But this element has a current as output. I could transform the current in a voltage with an inverting amplifier using the feedback resistor and an operational amplifier, but this would result in a negative voltage. But I do NOT want to generate a negative voltage!
I was already thinking about a normal shunt/resistor, but I am not sure whether this would work and what value the resistor must have.
Has anyone an idea?
Stephen
 

Resqueline

Jul 31, 2009
2,848
Joined
Jul 31, 2009
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2,848
On page 6 here there seems to be shown a way.
It's drawn by hand and details are hard to discern but you'll get the idea.
It seems to kind of feed the reference voltage in backwards and uses a shunt + an op-amp.
 
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