current output DAC's (repost)

[Jamie Morken]

Hi,

I am hooking up a 12bit current output DAC (DAC7811)

http://focus.ti.com/docs/prod/folders/print/dac7811.html

with a 0V to 5V output voltage range.

I am putting an opamp I to V converter on the output
of this current output DAC.

The datasheet shows these two hookups:
1. negative voltage output
Vout = -Vref * Code/4096

http://rocketresearch.nekrom.com/new/current output DAC/currentou...

2. positive voltage output

http://rocketresearch.nekrom.com/new/current output DAC/currentou...

I would like the positive voltage output but it requires a -2.5V
reference. What would be the
best way to hook this DAC up for a 0V to 5V output range?

If I use a a -5V reference instead of the -2.5V reference will
this provide a 0V to 5V output range? Does the output opamp
need a bipolar supply as well for this?

It seems that since a voltage output DAC doesn't need any negative
rails to generate unipolar output a current output DAC shouldn't
either?

cheers,
Jamie


ps. sorry for repost, my original post went to an old thread from
January