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’d rather the LOG and skip the Maxim hassle. The transistors might be on separate dies for all I know. Chris Johnson 7 For example, does not search Maxim-Direct, i. I just get the default circuit.

TI datasheer making the part at all as far as I can tell. I tried adjusting the Hfe of the transistors and unless it was something like it kept a very clean log output.

This is probably not the way to go unless there is a need for an LED bargraph in the circuit already. Devices equivalent to the LM are now being made by another company: By using our site, you acknowledge that you have read and lmm394 our Cookie PolicyPrivacy Policyand our Terms of Service.


Spring Semester, Monday — Friday: MikeJ-UK 5, 11 Facilities Lab Research in the department is conducted in a variety of dxtasheet equipped with state-of-the-art equipment, with research funding coming from federal, state, and private sources. Two LMs can be stacked to get 60 dB range.

What is the new standard log amp circuit? If you modulated the reference voltage by 3dB, the output would probably average to about the right value. There is no commitment that if you design it in to your circuit, you will be able to purchase it later. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site the association bonus does not count.

MAT12 is still in production, but octopart. The traditional logarithmic amplifier circuit is described in National Appnote TI has a bunch of chips that implement log amps.

However, I’m datashheet sure how suitable it is for your application. TI still lists the part in their catalog, but designates it as obsolete. Roman has mentioned that component. Octopart is not comprehensive.

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This circuit looks to be a log amplifier using two op-amps, two transistors, a few passives and a current source. Welcome to the ECE Store. You have to find the dealer in Moscow can find an email or phone in case someone need it. Prices are subject to change without notice. Home Questions Tags Users Unanswered. The specs are identical to the original. You can find them here But the plant does not sell them directly. I don’t know what the definitive chip is but there are many chips that implement the whole circuit.


I had this idea for a quick and dirty log amp.

That would more-or-less be an interpolation between 3dB values. Thank you for your interest in this question. I can use LM array, but the specs are far worse. For details datashet these services, please click the appropriate link from the menu on the left.

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I’m not sure to what extent other parameters would matter, though. Joseph Perkins 1 1. Intersil makes a number of transistor arrays some are certainly single die and well matched.

Our People Search the directory for faculty or staff members. How can I cheaply make a logarithm?