Re: ADR425 equiv with sink capabilities.

On Tue, 19 Sep 2006 19:39:30 +0200, Fred Bartoli
<fred._canxxxel_this_bartoli@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

In a attempt to be clever I used this ref for making a floating negative
ref voltage, without checking further than some data*** internal
drawing showing the output driver as an opamp.

Yes, I should have known better, but now I've something like:

.---------------.
V+ -----|Vcc Vout |--------.
| | |
| | ===
| | GND
| |
| |
| 0V |
'---------------'
|
|
+---------------> -Vref
|
.-.
| |
| |
'-'
|
V-


with a ref. that can't sink the output current, so it doesn't work.

Anyone knowing a pin compatible substitution for the ADR425 (5V-MSOP8)
able to sink current. This will avoid me a new PCB run.

Similar to the data *** Figure 47:


.---------------.
V+ -----|Vcc Vout |-----. .-------.
| | | | |
| | --------- ===
| | \ - + / GND
| | \ /
| | \ /
| 0V | \ /
'---------------' |
| |
| |
+---------------+-----> OUT

Of course it takes a really good OpAmp to maintain the accuracy :-(

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
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