Electronics > Projects, Designs, and Technical Stuff

LM399 - die analysis

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Noopy:
Hi all,


I have took a closer look on a LM399 shunt reference.



Actually it´s a HP-part...


You can find the whole story here:
https://www.richis-lab.de/REF02.htm
(german)




A nice die with big structures!  8)


Reverse engineering is not a big deal:




And here is the buried zener:




I found a circuit that´s not in the datasheet:



It seems they had to do some fancy compensation.  :-/O


And here the heater-circuit:




I wrote a lot about the circuit but it´s too late to translate all that words to english. Please use the google translator and ask me whatever you want.  :popcorn:


BTW:
I also have a PMI REF01:
https://www.richis-lab.de/REF01.htm



Interesting point: The new ones are ADR01 named REF01.


Have fun!  :popcorn:


…does anybody want to donate me a (dead) LTZ1000?  ;D
Update: Hey, it seem´s that I´ll get one out of the german mikrocontroller.net-Forum!  :clap: :clap: :clap:

iMo:

--- Quote ---Bei der Z-Diode D1 handelt es sich anscheinend um die gleiche Subsurface-Diode wie im Shuntregler.
--- End quote ---
Yes, the Dobkin's paper confirms that.
2 burried zeners there.

PS: I can send you a MAC199 (TESLA's highest grade LM399 clone) for de-capping if interested.

PPS: TESLA's schematics show the missing transistor and resistors, there is even one additional transistor more :)

rhb:
What is a 1991 die doing in a 1985 date code package?  Where did the device come from?

Squiddaddy:
Looks like 199 I to me, not 1991.

chickenHeadKnob:

--- Quote from: rhb on January 18, 2020, 12:02:22 am ---What is a 1991 die doing in a 1985 date code package?  Where did the device come from?

--- End quote ---

The original part was LM 199

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