General Description. The AS and AS are junction isolated ultra well- matched monolithic NPN transistor pairs with an order of magnitude improvement in. LM/LM Supermatch Pair. General Description. The LM and LM are junction isolated ultra well- matched monolithic NPN transistor pairs with an. LM datasheet, LM circuit, LM data sheet: NSC – LM/LM Supermatch Pair,alldatasheet, datasheet, Datasheet search site for Electronic.
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I can use LM array, but the specs are far worse.
I tried adjusting the Hfe of the transistors and unless it datasgeet something like it kept a very clean log output. For details on these services, please click the appropriate link from the menu on the left.
LM Datasheet, PDF – Alldatasheet
Soldering Tips Helpful Link: You can also see open positions in the department. Welcome to the ECE Store. They are just lj394 the National Semi datasheet as a courtesy since they bought National.
So Maxim doesn’t have any either. Those “transistors” are identical. Especially in this circuit, which lives and dies by transistor matching, the simulator is going to give a very optimistic performance estimate. Intersil makes a number of transistor arrays some are certainly single die and well matched.
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You can find them here But the plant does not sell them directly. That would more-or-less be an interpolation between 3dB values. Because it has attracted low-quality or spam answers that had to be dataheet, posting an answer now requires 10 reputation on this site the association bonus does not count. As usual, Maxim parts do not exist.
Devices equivalent to the LM are now being made by l3m94 company: This circuit looks to be a log amplifier using two op-amps, two transistors, a few passives and a current datahseet.
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However, I’m not sure how suitable it is for your application. TI has a bunch of chips that implement log amps. It seems that this is not recommended for new designs but the replacement is datasheeg MAT Roman has mentioned that component. Engineering Program is accredited by: The traditional logarithmic amplifier circuit is described in National Appnote MAT12 is still in production, but octopart. To see a list of open positions, click here.
The chip has almost the same name: The specs are identical to the original.
LM Datasheet(PDF) – National Semiconductor (TI)
I don’t know what the definitive chip is but there are many chips that implement the whole circuit. You have to find the dealer in Moscow can find an email or phone in case someone need it.
TI still sells some Burr Brown log amps but they are lm934. How can I cheaply make a logarithm? TI still lists the part in their catalog, but designates it as obsolete.
That’s an interesting forum thread, especially the story about MAT For example, does not search Maxim-Direct, i.
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Facilities Lab Research in the department is conducted in a variety of laboratories equipped with state-of-the-art equipment, km394 research funding coming from federal, state, and private sources. How about the LS from Linear Systems?
The well-matched transistor pair Q1a and Q1b are halves of the LM “supermatch” transistor pair. Search the directory for faculty or staff members.
This circuit uses the difference of two transistor currents to generate the log of the input over a pretty wide range.