karesz said:Hi,
I assume that both ICs are not from same vendor...
You can have some other driving & load situation/other power supply (i.e. higher) voltages...
K.
Added after 7 minutes:
Atur;
I did checked one National datasheet yet: SR=0.5 V/us is TYPICAL data!
Nothing is to find over minimal/maximal values, in that case you can clear have -by some exemplars- really better values_ but worser data too... Your oscilloscope decalibration makes only ca. 5%, but your SR-deviation is higher
K.
karesz said:OK, You can try lot of philosophy,, but a typical data will be for ever a possible typical value & has a +/- range of (in that case)unknown wide_thats life...
ICs has usual a fabrication code, but its not every time simple to encode...
Typically are days or week of calendar + 2 characters oy production year stamped, also i.e. 4 Nrs, but often are production places coded too...
You have it to check in accordance the special vendors coding system. I think, these isnot so relevant
K.
Sorry my friend, I believ it enough detailed to have answered befor these small remarks over "realities in life"... You need it only attentive to read, pls.arturbdg said:...when I will write the report the question that will need to be answered is why the slew rate is so different from the datasheet typical value, and "that's life" is not much for an answer.
A.
karesz said:Sorry my friend, I believ it enough detailed to have answered befor these small remarks over "realities in life"... You need it only attentive to read, pls.arturbdg said:...when I will write the report the question that will need to be answered is why the slew rate is so different from the datasheet typical value, and "that's life" is not much for an answer.
A.
Good progress!
K.,
karesz said:I think, thes is a original Fairchild type, but after ca. 30-35 years is possible the chip design no more the same... You can try he datasheet from Fairchild_yet by TI; her:https://focus.ti.com/lit/ds/symlink/ua741.pdf
Well, its not much others as from NI and so on.
Can be that you have others capacitive load & Input signal Offsetts?
But remember pls, as I wrote it to my begin too: its a typical spec, with +/_ (maybe 20-50%??, nobody knows it better)values... Your professor must know it exactly so too.
K.
arturbdg said:karesz said:I think, thes is a original Fairchild type, but after ca. 30-35 years is possible the chip design no more the same... You can try he datasheet from Fairchild_yet by TI; her:https://focus.ti.com/lit/ds/symlink/ua741.pdf
Well, its not much others as from NI and so on.
Can be that you have others capacitive load & Input signal Offsetts?
But remember pls, as I wrote it to my begin too: its a typical spec, with +/_ (maybe 20-50%??, nobody knows it better)values... Your professor must know it exactly so too.
K.
unfortunately I don't have more of 741 op amps,but I had several of TL072 op amps, their min slew rate is 5V/us , with typical of 13V/us. I checked 3 of them and I had this results: 14.11V/us 15.48V/us and 13.71V/us , so they swing quite a lot, thus it must be true what you are saying....
Question is then does anyone knows where to find information whether typical value have any limits in terms of deviation. I mean it is a technical document so it does need to have some standard right?
Thanks for your help
Artur.
stefannm said:The datasheet SR is based on certain conditions: unity gain configuration, and a load of 2K || 100pF. You are measuring a no-load (oscope probe capacitance only) positive feedback circuit. You should see a higher slew rate than the typical value. See Figure 1 in the TI datasheet and test that configuration. I bet you see something closer to .5V/us
stefannm
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