PDA

View Full Version : Driving -5v to +5v



Peter J. Fischel
05-24-2008, 03:38 AM
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

Rayman
05-24-2008, 03:48 AM
Might be easier to use a 0-5V DAC and then an OPAMP to double and shift the voltage...

Paul Baker
05-24-2008, 03:56 AM
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 (mailto:pbaker@parallax.com)
Propeller Applications Engineer
[/url][url=http://www.parallax.com] (http://www.parallax.com)
Parallax, Inc. (http://www.parallax.com)

Rayman
05-24-2008, 04:01 AM
I just looked and I think that's with some Opamps added to the outputs, right?

Peter J. Fischel
05-24-2008, 04:05 AM
Yeah with op amps.ˇ

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 (GalvoˇGalvanometer). Hoping to make a niceˇlaser projector with the Propeller chip. Wish meˇluck :)

Peterˇ