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Convert Digital Output from DAQ to Analog output?

  1. Feb 23, 2009 #1
    We are using a DAQ (data acquisition) board for our project, that has only 2 analog outputs, but we need 4. It also has some digital outputs... Is there a way to convert the digital outputs into analog, and if so, what is it?

  2. jcsd
  3. Feb 23, 2009 #2


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    Gold Member

    You could use a simple summing amplifier, flash converter, or bipolar conversion. The reconstructed digital signal will never be as good as a true analog signal. The more of the digital out puts you use in your converter the more voltages you can get out.
  4. Feb 23, 2009 #3
    I would just have one of the digital IO's output a PWM to an RC filter.
  5. Feb 23, 2009 #4


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    Gold Member

    so you want a 1 bit DAC?
  6. Feb 23, 2009 #5


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    Staff: Mentor

    If you have enough digital outputs spare, you can make a ladder DAC out of them. An R-2R Ladder DAC works well.
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