Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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?

    Thanks
     
  2. jcsd
  3. Feb 23, 2009 #2

    madmike159

    User Avatar
    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

    madmike159

    User Avatar
    Gold Member

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

    berkeman

    User Avatar

    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.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Convert Digital Output from DAQ to Analog output?
Loading...