LM Single Operational Amplifiers. LMA LMA INPUT OFFSET VOLTAGE mV 2mV INPUT BIAS CURRENT 25nA 70nA INPUT OFFSET CURRENT. description. The LMA, LMA, and LMA are high- performance operational amplifiers featuring very low input bias current and input offset voltage and. LM datasheet, LM pdf, LM data sheet, datasheet, data sheet, pdf, Linear Technology, Operational Amplifiers.
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I’m trying to understand what’s the purpose of the two diodes connected to the compensation pin 8and what the output of the comparator is supposed to be. Open the datasheet from your link on page 16 and look where pin 8 comes from. The second adtasheet is not equal to the first. The first makes voltage limiting on the low power circuit of the OpAmp and then the ouput emitter follower as its name says outputs a voltage with similar waveform but with higher load capability.
The behaviour of the diode voltage limiter is similar to this circuit:. In your second schematic the output of the OpAmp will be like the first waveform, but because of the resitor divider will be scaled and moved up so its minimum is about 0V and its maximum is about 5.
As long as the OpAmp works in a open feedback loop as a comparator no feedback connection, maximum gain both will output similar waveforms. The difference will apper when you close the feedback loop for some exact gain.
This will have effect on the load you can attach to this circuit. The second will work with minimal distortion only with highest impedance inputs – about 1 MegaOhm, while the first can work with kOhm loads without an issue.
Link to the datasheet. Without a datasheet, this is datasheef non-question. Any reason not to use an IC designed to perform as comparator? Similar thing is done on Fig.
Update The second schematic lj301 not equal to the first. The behaviour of the diode voltage limiter is similar to this circuit: See how the signal is cut. Todor Simeonov 1, 3 I updated the post with a modified schematic, that way would be equivalent?
DimitriPetrucci see the update.
But, what if I put a capacitor in the positive feedback? Would it still work like a comparator? The result will be some kind of oscillator, but it is uncommon.
LM Datasheet pdf – Operational Amplifiers – Linear Technology
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