| General > General Technical Chat |
| Dumbest "equivalent schematic" from a datasheet - how many errors can you find? |
| (1/6) > >> |
| magic:
Datasheet schematics happen (albeit not always) and so do small errors or sometimes deliberate omissions. But "small" apparently isn't enough for TI. Here's their (simplified) schematic of TS321, a single operational amplifier equivalent to half of LM358. One might think it should have been a job easy enough... ::) |
| fourfathom:
(#1) PNP output transistor base-emitter short. (#2 Trivial) Missing Vcc connection dot. |
| SiliconWizard:
Ah well, shit happens. ;D The not-so-good part is that it never got fixed (just checked). It's still in the current datasheet. |
| magic:
I did take it from the current datash*t ;) But you aren't wrong, it goes back all the way to 2005. Still one blatant error to go. Hint: - are polarities of the inputs even right? - would it be stable without a whole bunch more compensation? OTOH, I just noticed that the connection of the current sink to output PNP base is not actually technically wrong, because the base is shorted to the output anyway. So perhaps one less than I thought :D |
| bsfeechannel:
LM358 equivalent circuit for comparison. |
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