LM are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for LM LM LM – Precision Reference, Package: TO, Pin Nb=4. The LM series are precision, temperature-stabilized monolithic zeners offering. Title, > 5V. Description, Precision Reference. Company, Linear Technology Corporation. Datasheet, Download LM datasheet. Quote. Find where to buy.

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An Evaluation Board is a board engineered to show the performance of the model, the part is included lm939 the board. The idea I’m exploring is to avoid any sort of trim on the output op-amp’s voltage divider just two fixed value resistors to set the gain.

Search Results for LM399 : 3 documents found

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This struck me as being interesting, because this greatly reduces the parts count, and also because the only pins which need to touch a voltage regulator are the op amp supply pins.

This circuit seems to work, but I do admit I’m having a hard time convincing myself that it wouldn’t suffer from start-up problems what would prevent the op amp from just staying at 0V? Additionally, it will keep that current fairly constant because the 10 volt output will be constant.


My first attempts were a traditional op-amp with current sense resistor on the low side. Also, please note the warehouse location for the product ordered.

LM based 10 V reference – Page 8

Screen Shot at 9. At work I am using some customized thermostats out of – you guessed right – tuner boxes embedded in styrodur-like foam. The model has been scheduled for obsolescence, but may still be purchased for a limited time. Did you miss your activation email? It’s a better way to create a constant current as stable as the LM it is powering.

Andreas on May 24, Status Status indicates the current lifecycle of the product. However, I realized having the current sense resistor on the low side would introduce current error one way or another. It looks like it forms a voltage divider with the k resistor, but I cannot figure out why they have that in there?

So I tried wrapping my brain around making a high-side current source, and this is what Datashheet came up with: International prices may differ due to local duties, taxes, fees and exchange rates. Product Lifecycle Production At least one model within this product family is in production and available for purchase.

National Semiconductor – datasheet pdf

The Sample button will be displayed if a model is available for web samples. I was going to ask why they don’t have it on the other circuits link the one at the very top “10V Buffered Reference” but your last sentence answered that for me thanks! The voltage may not be very accurate during start up but it will be a few volts and the op-amp will produce some amplification and then deliver enough current through the 5 kohm to properly bias the LM Thanks Andreas Quote from: One could top it off with a Petri dish?


By using our site, you acknowledge that you have read and understand our Xatasheet PolicyPrivacy Policyand our Terms of Service. Sign up using Email and Password. BOM costs thus far: Andy aka k 10 Can you explain “start-up the device” a little bit more?

With best regards Andreas. Home Questions Tags Users Unanswered. X-axis is heater voltage left Y-axis is 2: Why is there an extra resistor on the opamp in the LM datasheet? The ratasheet has not been released to general production, but samples may be available.

The various ranges specified are as follows: For more information about lead-free parts, please consult our Pb Lead free information page. PSRR power supply rejection ratio on 14 60uV is nearly 2: Welwyn makes a 0.