AD780S: Do you have any radiation reports, TID or SEE for AD780S ?

Q I am currently evaluating AD780 voltage reference. Since this product is QMLR, could you give me radiation reports (TID and SEE)? A We have a TID radiation test report for the AD780S devices. See attached. Unfortunately, we do not have an SEE radiation test report for the AD780S devices at this time. Attachments: AD780_open_market_TIDreport.pdf

Q Thermal data A The junction temperature depends on a lot of variables, such as supply voltage applied, output load, etc etc. Tj = Ta + theta_ja x Pd This article explains how to estimate junction temperature. http://www.analog.com/static/imported-files/tech_articles/MS-2251.pdf . Take a look at page 4. Thermal resistance, theta_ja for an 8 lead SOIC is 120C/W. Looking at the excel spreadsheet that you attached, I think you might be asking for the abs max rating for junction temperature. For a majority of our amps/references, they are -65C to 150C.

AD780 long term drift

Q I have questions about the AD780 long term drift spec need your help. In the datasheet, the long term stability is +/-20ppm/1000hr (typical), and there is note for it, says "The long-term stability specification is no cumulative. The drift in subsequent 1,000 hour periods is significantly lower than in the first 1,000 hour period." My questions are: 1) what does the "subsequent 1,000 hour periods " mean in the datasheet. Does it means, once the part worked cumulately more than 1000hr, the drift will be lower(better) than before? Or if the part have worked more than 1000Hr, then we power down it, then power up it again, does the stability specification could go back? Hope I explain my question clearly :) 2) how do we test the long term stability? And is the +/-20ppm/1000hr spec just a statistical? A Long term drift refers to the warm up time and operation of the part. So once a part is powered up( in a static or dynamic way) and left alone, its output will shift until it reaches its stability. The majority of the drift happens at the early hours. it is usually expressed in ppm/1000 hours. Long term drift is a "random walk" phenomenon and increases with the square root of the elapsed time. There are 8766 hours/year. Therefore 1 year figure will be sqrt(8.766) ≈ 3 times the 1000 hour figure. ten year value will be roughly 9 times the 1000 hour value. In practice, things are a little better even than this, as devices tend to stabilize with age. We usually power up couple of parts in the lab in a controlled environment and let it sit there for 1000 hrs and collect data at different time intervals. AN-713 for more details.

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Products Mentioned

AD780 Production
The AD780 is an ultrahigh precision band gap reference voltage that provides a 2.5 V or 3.0 V output from inputs between 4.0 V and 36 V. Low initial error...
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AD780S Obsolete
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AD780S on Analog.com

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