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| 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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