opamp with 0-5v input and +/-5v output

[dimention11]

Hello
This is my first post to sci.electronics. I have no formal electronics
training but have completed quite a few DIY projects ( Digital and Analogue)
from the net and elsewhere.

At the moment I am working on a Printerport (lpt) dac using the Quad 8bit
DAC Max506.
This chip has a rail-to-rail output voltage (0-5V) for the application I
need +/-5v. I know (think an opamp is the solution. However I am still
bamboozled by some of the tech jargon on the datasheets. If anyone knows of
a solution off the top of their heads I would really appreciate it. if not I
will report back with a couple of chips data sheets and ask for some
guidance.

If you need more info I can email my project so far

Kurt

 

[Robert Baer]

Hello
This is my first post to sci.electronics. I have no formal electronics
training but have completed quite a few DIY projects ( Digital and Analogue)
from the net and elsewhere.

At the moment I am working on a Printerport (lpt) dac using the Quad 8bit
DAC Max506.
This chip has a rail-to-rail output voltage (0-5V) for the application I
need +/-5v. I know (think an opamp is the solution. However I am still
bamboozled by some of the tech jargon on the datasheets. If anyone knows of
a solution off the top of their heads I would really appreciate it. if not I
will report back with a couple of chips data sheets and ask for some
guidance.

If you need more info I can email my project so far

Kurt

Certainly one can use an opamp to amplify the 5V swing to a 10V
swing, and make that amplified signal go from -5V to +5V.
As you can see, that is a gain of two.
To prevent problems at the extremes, the opamp should be powered from
+/- 10V (or better) supplies.
I strongly suggest that you do not use any Maxim parts; the majority
of what they advertise is "vaporware".

 

[WDino]

ANY OP amp can be configured to have a 0-5V input and a +/-5v output.

You would need to connect it to a + 7 and - 7V (or more) power supply and bias
the input with resistors so that the required conditions are met.

A simplified circuit to give a gain of two, -5v out with 0v in, and +5v out with
+5 in :

+ve 10V supply
|
---------------------------
| |
\ |
100K / |
\ +|xx. |
/ O----------| xx|
| |OpAmp xx --+---O
+--------------+----| xx| |
| | -|xx' | |
\ | | |
100K / ---/\/\/\--------
\ 50K |
/ |
| |
---------------------------
|
-ve 10v supply

And one to give a gain of two, +5v out with 0v in, and -5v out with +5 in :

+ve 10V supply
|
---------------------------
| |
| 100K |
\ ---/\/\/\--------
50K / | | |
\ 50K | _|xx. | |
/ O--/\/\/\--+----| xx| |
| |OpAmp xx --+---O
+-------------------| xx|
| +|xx' |
\ |
100K / |
\ |
/ |
| |