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'[EE] .6 volt reference, diode?'
2007\01\01@134513 by John Pearson

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I need about .6 volt voltage reference for up to 4 op-amps. The current will be much less than 5mA. The exact voltage is not critical, but I am wondering if a good diode would work. Are there better diodes than others when it comes to consistancy in voltage drop and thermal stability?

2007\01\01@141254 by Steve Smith

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TL431 and a couple of resistors (providing the load is for reference only)
and the current is insignificant

Steve

{Original Message removed}

2007\01\01@141802 by Denny Esterline

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> I need about .6 volt voltage reference for up to 4 op-amps. The current will be much less than 5mA. The exact voltage is not critical, but I am wondering if a good diode would work. Are there better diodes than others when it comes to consistancy in voltage drop and thermal stability?
> --

An old Bob Pease article on shunt references: http://www.national.com/rap/Application/0,1570,24,00.html

National has about 2 dozen options http://www.national.com/cat/index.cgi?i=68 , but I don't see any at 0.6 v. You may use one to feed a voltage divider, but that will degrade the accuracy some (I'd have to dig for the exact math, but the resistors add some new tempco terms as well as the initial tolerance, plus a variation according to load) That may or may not be acceptable for your application.

There's also Maxim's offerings http://para.maxim-ic.com/index.mvp?tree=references Always good for a free sample, but I wouldn't reccomend them if you need more than 2 and less than 100k :-)

-Denny



2007\01\01@153020 by Debbie

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--- Denny Esterline <spam_OUTfirmwareTakeThisOuTspamtds.net> wrote:

> > I need about .6 volt voltage reference for up to 4 op-amps. The current
> will be much less than 5mA. The exact voltage is not critical, but I am
> wondering if a good diode would work. Are there better diodes than others
> when it comes to consistancy in voltage drop and thermal stability?
> > --

I've used a single 1N914 fed by a 4K7 from a 5V supply as the ref voltage to
the inv & non-inv inputs on two individual comparators in an LM339. The voltage
on various 1N914s was almost exactly 0.6 V and the comparator i/p didn't seem
to load them at all. You'd probly notice a difference if you drew more than a
few uA from the diode cct, tho.
Deb

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