negative voltage needed

Discussion in 'The Projects Forum' started by ilex-xygon, Aug 16, 2008.

  1. ilex-xygon

    Thread Starter New Member

    Aug 16, 2008
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    I am trying to work out how to create a -5V line to upto 8 instrument amp IC's. The outputs will be connected to a DAQ for logging by a laptop. The DAQ has ground,+2.5V and +5V powered by the laptop but no negative. The circuit used must provide a low ripple output or false readings will be given.
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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    If it's low current, check an inverting charge pump like a 7660. Put in +5 and out comes -5.
     
  3. SgtWookie

    Expert

    Jul 17, 2007
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  4. ilex-xygon

    Thread Starter New Member

    Aug 16, 2008
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    Thank for the quick response, alread on the datasheet.
     
  5. beenthere

    Retired Moderator

    Apr 20, 2004
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    Oops, the "ICL" prefix is pretty significant.
     
  6. SgtWookie

    Expert

    Jul 17, 2007
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    Actually, they ARE made by other manufacturers with different prefixes. National has the LM7660. It's pretty much an industry standard part. I didn't bother doing a lot of searches. The ICL7660S looks pretty interesting, though.
     
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