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TINA/Spice/TL081: offset pins are missing

user4969388
Prodigy 10 points
Part Number: TL081
Other Parts Discussed in Thread: TINA-TI, , TL082

Tool/software: TINA-TI or Spice Models

Hello,

I've found a serious problem. I've tried to used the TL081 Amplifier with offset, but the Spice was not well definied.  Please catch these:

http://www.ti.com/general/docs/datasheetdiagram.tsp?genericPartNumber=TL081&diagramId=SLOS081I
and
http://www.ti.com/lit/ds/symlink/tl081.pdf
You can clearly see that Offset N1 and Offset N2 are valid on pin1 and on pin5.

Has anybody suggestion (or step-by-step tutorial) how to make it correctly work in the simulation?

Thank's in advance,
Joe

  • 0
    TI__Mastermind 37445 points
    The TL082 (w/o offset pins) and TL081 seem to share the same model, also without the offset pins. This model was done back in 1989, so we no longer have records about why it was done that way.
    The most likely reason is that modeling the real TL081 offset behavior wouldn't have been practical since it would depend on variations within the manufacturing and assembly process.
    As a workaround, you could adjust the model's output offset with an external DC voltage source at the inverting or noninverting pins, but it probably won't have the same behavior as the real TL081.
    Regards,
    John