Changed layout of National Data Sheet to TI format. LevelC-UNLIM. to LMM. LMN. ACTIVE. PDIP. NFF. TBD. Call TI. Call TI. LMN Datasheet, LMN National Semiconductor Frequency to Voltage Converter Datasheet, buy LMN. LMN LM – Frequency to Voltage Converter, Package: Soic Narrow, Pin Nb= The LM Details, datasheet, quote on part number: LMN.

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I’m trying to sense the freq datashedt a square wave from 10KHz – 40KHz range. Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets. Thank you for your reply.

Potentiometer Questions Started by norbss Yesterday at Stick with the LM I’m sure the LM is capable of doing what you want, it just needs some component changes to set the range.

Why not connect the output to a transistor base. Both of these configurations are available with an active shunt regulator connected across the power leads. Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at So, what can I do. Thank you a lot. This is important as the lj2907n signal MUST cross this zero volt threshold:!: BUT As the circuit will lose some voltage it will stop short of 12v out.

Also, I need to be very conservative wrt adding components. Any suggestions on how to implement that? The input signal must therefore go positive AND negative for the circuit to work. Adding 2 more ics to do the trick is not an option. I have followed the datasheet of LMN to design a frequency to voltage circuit.


Forums New posts Search forums. Click here to register now. Sebi Active Member Jul 2, But I need 10khz to 40khz give me a 0 volt – Vcc variation.

As i read from d’sheet it can’t do this. Media New media New comments Search media. Datasheets, Manuals or Parts. Don’t worry about calculating the R1,C1,C2 values. The tachom- eter uses a charge pump technique and offers frequency doubling for low ripple, full input protection in two versions LM, LM and its output swings to ground for a zero frequency input. But i want to know the accuracy of this circuit?

By continuing to use this site, you are consenting to our use of cookies. Frequency to Voltage Converter. To participate you need to register. National Semiconductor Electronic Components Datasheet. The two basic configurations offered include an 8-pin device with a ground referenced tachometer input and an internal connection between the tachometer output and the op amp non-inverting input. Thank you very much.

Both of these configurations are available with an active.

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Klaus New Member Jul 3, I don’t know why. Can any professional give me a design which can achive a higher range of output, e. It only can be varying within V output for 40Hz input. Sorry, can anybody give me fatasheet or the circuit is correct or any incorrect place?

The more versatile configurations provide differential ta. I am before use the below circuit and it work. To do better requires more info – supply voltage, rest of circuit components? Articles Top Articles Search resources.


The IC has three basic sections, a trip amp, a charge pump and an op amp, if datazheet charge pump and following integrator can’t be ln2907n to the desired time constant then the op amp can give lots of gain.

LMN Datasheet(PDF) – National Semiconductor (TI)

With this version the tachometer input may be floated and the op amp becomes suitable for active filter conditioning of the tachom- eter output. Sorry, can you give me any advice of which type can do such thing?

Or any other methods can achieve the task? But I still cannot be sucessful to make a larger datashwet output range. Welcome to our site!

Replacement Transformer Started by ncag 47 minutes ago Replies: You must log in or register to reply here. Also, the ripple of the output will affect the output range or not?

LM – 8 pin package As you show daasheet 8 pin package circuit, I assume this is what you have – there is a 14 pin version as well. The 8 pin package has the op-amp input stage’s inverting input connected to ground via pin 8the non-inverting input is on pin 1.

National Semiconductor – datasheet pdf

This version is well suited for single speed or frequency switching or fully buffered frequency to voltage conversion applications. As I want to know the attached circuit is correct as what you mention? You can then drive the transistor to give you an output of dattasheet to Vcc.