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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For details on these services, please click the appropriate link from the menu on the left. What is the new standard log amp circuit? MikeJ-UK 5, 11 Engineering Program is accredited by: So Maxim doesn’t have any either. I can use LM array, but the specs are far worse.

Roman has mentioned that component. Intersil makes a number of transistor arrays some are certainly single die and well matched. Two LMs can be stacked to get 60 dB range.

LM Datasheet(PDF) – National Semiconductor (TI)

But National discontinued this part last year with no clear replacement. This is probably not the way to go unless there is a need for an LED bargraph in the circuit already. Especially in this circuit, which lives and dies by transistor matching, the simulator is going to give a very optimistic performance datwsheet. Joseph Perkins 1 1. The specs are identical to the original.

For example, does not search Maxim-Direct, i. To see a list of open positions, click here. It seems that this is not recommended for new designs but the replacement is the MAT However, I’m not sure how suitable it is for your application. The transistors might be on separate dies for all I know. The traditional logarithmic amplifier circuit is described in National Datashset Facilities Lab Research in the department is conducted in a variety of laboratories equipped with state-of-the-art equipment, with research funding coming from federal, state, and private sources.

You can also see open positions in the department. MAT12 is still in production, but octopart. The ECE Store provides many services to electrical and computer engineering students in order to create a safe environment in which students have access to the equipment and parts they need. Octopart is not comprehensive.

Our People Search the directory for faculty or staff members. This circuit looks to be a log amplifier using two op-amps, two transistors, a few passives and a current source. Because it has attracted low-quality or spam datashdet that had to be removed, posting an answer now requires 10 reputation on this site the association bonus does not count. Maxim direct is saying 15 weeks lead time for single parts. There is no commitment that if you design it in to your circuit, you will be able to purchase it later.

I tried adjusting ratasheet Hfe of the transistors and unless ddatasheet was something like it kept a very clean log output. Spring Semester, Monday — Friday: Would you like to answer one of these unanswered questions instead? TI has a bunch of chips that implement log amps. Thank you for your interest in this question. I just get the default circuit. How can I cheaply make a logarithm? The well-matched transistor pair Q1a and Q1b are halves of the LM “supermatch” transistor pair.

So no cheaper than the LOG How about the LS from Linear Systems?

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I’d rather the LOG and skip the Maxim hassle. I’m not sure to what extent other parameters would matter, though.

I don’t know what the definitive chip is but there are many lm934 that implement the whole circuit. If you modulated the reference voltage by 3dB, the output would probably average to about the right value.

Home Questions Tags Users Unanswered. The chip has almost the same name: You have to find the dealer in Moscow can find an email or phone in case someone need it.