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Driving -5v to +5v — Parallax Forums

Driving -5v to +5v

Peter J. FischelPeter J. Fischel Posts: 28
edited 2008-05-23 20:05 in Propeller 1
Good afternoon guys.

I am in need to have a DAC such as LTC7541 drive a voltage that would vary from -5v to +5v.
So basically -5v ... 0 ... +5v

I can't seem to get my head around how this would be accomplished. Each way I think about it, I feel there must be a short which would be way wrong.

Do any of you know what this type of circuit would be called or of any examples?

Thanks in advance,

Peter

Comments

  • RaymanRayman Posts: 14,817
    edited 2008-05-23 19:48
    Might be easier to use a 0-5V DAC and then an OPAMP to double and shift the voltage...
  • Paul BakerPaul Baker Posts: 6,351
    edited 2008-05-23 19:56
    Did you look at the last figure of the datasheet? If you look at the table it swings the voltage from -Vref to Vref, so if Vref = 5 the voltage swing would be -5 to 5.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Paul Baker
    Propeller Applications Engineer

    Parallax, Inc.
  • RaymanRayman Posts: 14,817
    edited 2008-05-23 20:01
    I just looked and I think that's with some Opamps added to the outputs, right?
  • Peter J. FischelPeter J. Fischel Posts: 28
    edited 2008-05-23 20:05
    Yeah with op amps.·

    Well, don't I feel silly. There is an example right on the Datasheet.

    Thanks for your guys help!

    Bipolar... gotta remember that.

    Trying to drive a Laser Scan head (Galvo·Galvanometer). Hoping to make a nice·laser projector with the Propeller chip. Wish me·luck [noparse]:)[/noparse]

    Peter·
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