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ADR425 equiv with sink capabilities.

In a attempt to be clever I used this ref for making a floating negative ref voltage, without checking further than some datasheet 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.

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Thanks,
Fred.
Reply to
Fred Bartoli
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Similar to the data sheet Figure 47:

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

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

...Jim Thompson

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|  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.
Reply to
Jim Thompson

Jim Thompson a écrit :

Indeed, but I was trying to avoid that :-)

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Thanks,
Fred.
Reply to
Fred Bartoli

In article , Fred Bartoli

Could you hack an ADR550 in there, as a two-terminal shunt reference between GND and -Vref?

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Tony Williams.
Reply to
Tony Williams

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