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D/A converter without negative voltage

Discussion in 'General Electronics Discussion' started by Steph123, Feb 13, 2010.

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  1. Steph123

    Steph123

    1
    0
    Feb 13, 2010
    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
     
  2. Resqueline

    Resqueline

    2,848
    1
    Jul 31, 2009
    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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