Hello.
A couple of days ago I found in my device that Vout from REF3112 sometimes was 1.36V instead of 1.25V. Conditions causing this behaviour was not clear and happen not often.
I determined that too high value of input filter resistor (R=1k, C=10u) and output capacitor (1u) are to blame for this. Changing R to 220 and Cout to 470n seemed to resolve the problem.
But today the problem reappeared (in another instance of this device). I think of reducing further the resistance, but how much?
Are there any constrains on output resistance of source supplying this reference? In example circuits there is no filtering, but I would like to use some.
Best regards.