[volt-nuts] LM399 Long term drift specification

Andreas Jahn Andreas_-_Jahn at t-online.de
Mon Sep 15 16:20:27 EDT 2014


the drift in sync is something that I have with humidity changes and 
plastic housings.
And they also have temperature changes of +/-4 deg C in the setup.
But usually the temperature gradient is different with different samples 
near room temperature.
The influence may also be due to PCB stress.

with best regards


Am 15.09.2014 um 19:35 schrieb M K:
> On 15/09/2014 17:57, Tony wrote:
>> On 14/09/2014 18:29, Andreas Jahn wrote:
>>> By the way:
>>> By accident I have found some ageing drift data of REF5050 on 
>>> Malone's homepage:
>>> http://www.voltagestandard.com/Tech_Data.html
>>> For me it looks around 120 ppm drift within the first year.
>>> Unfortunately there is no humidity data with the plot.
>>> With best regards
>>> Andreas
>> That's a very interesting find Andreas, thanks. After approx 500 
>> hours, maximum drift is approx 80ppm, but its impossible to deduce 
>> how much of that is due to long term drift, temperature and humidity 
>> changes.
>> The long term drift specification for the REF5050A tested is 125ppm 
>> (0-1000 hours), 45ppm (1000 to 2000 hours). Those for the automotive 
>> qualified REF5050-Q1 part are 100ppm and 10ppm respectively - way 
>> better after the initial 1k hours.
>> Regards,
>>  Tony H
> One thing that concerns me is that all 5 units seem to drift in sync, 
> so how much of that is the DVM doing the measuring? or is it just a 
> single batch with the same date code?
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