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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Or any other methods can achieve the task? 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.

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As I want to know the attached circuit is correct as what you mention? With this version the tachometer input may be floated and the op amp becomes suitable for active filter conditioning of the tachom- eter output. Electro Tech is an online community with overmembers who enjoy talking about and eatasheet electronic circuits, projects and gadgets.

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. Potentiometer Questions Started by norbss Yesterday at Now I understand the chip gives you a 0volts to Vcc variation for 0 Hz to fmax.


I have made the circuit but seem not work.

Don’t worry about calculating the R1,C1,C2 values. Welcome to our site! Frequency to Voltage Converter. Forums New posts Search forums. The two basic configurations offered include an 8-pin device. Articles Top Articles Search resources. Also, I need to be very conservative wrt adding components. Datasjeet two basic configurations offered include an 8-pin device with a ground referenced tachometer input and an internal connection between the tachometer dataheet and the op amp non-inverting input.

Thank you for your reply. Thank you a lot. The IC has three basic sections, a trip amp, a charge pump and an op amp, if the charge pump and following integrator can’t be set to the desired time constant then the op amp can give lots of gain. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.

The LM, LM series are monolithic frequency to. This version is well suited for single speed or frequency switching or fully buffered frequency to voltage conversion applications. The input signal must therefore go positive AND negative for the circuit to work. I’m trying to sense the freq of a square wave from 10KHz – 40KHz range. As i read from d’sheet it can’t do this. It only can be varying within V output for 40Hz input.

Any suggestions on how to implement that? This feature allows either a ground or supply referred load of up to 50 mA. This op-amp works as a sort of ‘trip amp’, whenever the input on pin 1 exceeds the voltage on pin 8 0v datasheet, the output to the charge pump will go high, being low at all other times. Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at Thank you very much.


Why not connect the output to a transistor base. LM, LM and its output swings to ground for a.

But I need 10khz to 40khz give me a 0 volt – Vcc variation. You must log in or register to reply here.

LMN Datasheet(PDF) – National Semiconductor (TI)

Sorry, can you give me any advice of which type can do such thing? This is important as the input signal MUST cross this zero volt threshold:!: To do better requires more info – supply voltage, rest of circuit components?

So, what can I do. You can then drive the transistor to give you an output of up to Vcc. Both of these configurations are available with an active.

That range can give me a larger range to have a more accuracy signal to do speed control. Other than that you said the circuit worked, xatasheet gave the wrong rangethe diagram you posted is correct, the vaues should be OK.

National Semiconductor Electronic Components Datasheet.