Precision High Speed Integrators. LF/ LF/ LF/. Units. LF LF/ LF • Fast D/A and A/D Converters. LF (AV=5). • High Impedance Buffers. 28 Apr The circuit designed by an LF chip which I think is obsolete now. The input signal to the LF is something like this and the frequency. 9 Aug it seems the LF is obsolete and can not be found easily except fake ones. it is a good opamp but it is not under production it seems.
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We had that discussion before.
Kleinstein on August 09, For a small signal level low noise might be more important than high GBW – quite some choices here if they can be slower. The Lf3577 could perform even better if it is externally decompensated however it would require changes in the offset null circuitry if used.
I don’t think there’s enough info as usual!
So please give a link to the other thread and make clear what properties are really needed. There was an error while thanking.
VanitarNordic Regular Contributor Posts: The LF is a low power LF From the old thread the application is rather low frequency and very high gain. Hero on August 09, If of357 null is required, lf57 it needs to use pins 1 and 5 and go to the positive supply.
I’m looking for a new substitute to introduce similar or better characteristics. David Hess on August 09, The LT is very close and should be a drop in replacement with improved performance.
Using 2 lt357 stages instead of 1 with very higher gain eases the requirements on GBW quite a bit. VanitarNordic on August 10, StillTrying Super Contributor Posts: Please login or register. Did you miss your activation email? Does it need to be in a dual in line package through hole?
LF Datasheet(PDF) – STMicroelectronics
August 10, For most applications, there are suitable and likely better replacements. Just to add to all the confusion. StillTrying on August 10, l3f57, VanitarNordic on August 09, The LF is a rather old design. David Hess Super Contributor Posts: It’s fast because it’s de-compensated, but not that fast to really need it.
LF357N – LF357 JFET Input Op-Amp
August 09, The following users thanked this post: As far as I understood from the other thread, the LF was not such a good choice anyway. Kleinstein Super Contributor Posts: The LF is a decompensated LF with a minimum stable gain of 5. No need to repeat the old discussion – things have not changes since last year. Hero Super Contributor Posts: However it depends on the application because something like input capacitance, supply voltage and common mode voltage can be an issue.
So the high BW is not absolutely needed as an 2 stage amplifier would be a real alternative.