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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Now I understand the chip gives you a 0volts to Vcc variation for 0 Hz to fmax.

Articles Top Articles Search resources. 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.

LMN Datasheet(PDF) – TI store

It only can be varying within V output for 40Hz input. Thank you very datasheef. BUT As the circuit will lose some voltage it will stop short of 12v out. This is important as the input signal MUST cross this zero volt threshold:!: Don’t worry about calculating the R1,C1,C2 values.

So, what can I do. Adding 2 more ics to do the trick is not an option.


That range can give me a larger range to have a more accuracy signal to do speed control. Welcome to our site! I don’t know why. Other than that you said the circuit worked, just gave the wrong rangethe diagram you posted is correct, the vaues should be OK.

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. By continuing to use this site, you are consenting to our use of cookies. LM, LM and its output swings to ground for a. But I still cannot be sucessful to make a larger voltage output range.

Click here to register now. Sorry, can you give me any advice of which type can do such thing? To participate you need to register. Also, the ripple of the output will affect the output range or not? Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at I have made the circuit but seem not work. As i read from d’sheet it can’t do this. National Semiconductor Electronic Components Datasheet.

Thank you for your reply.

Datasheets, Manuals or Parts. Both of these configurations are available with an active. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. This feature allows either a ground or supply referred load of up to 50 mA.


I have followed the datasheet of LMN to design a frequency to voltage circuit. Why not connect the output to a transistor base. l2m907n

Forums New posts Search forums. Frequency to Voltage Converter. But i want to know the accuracy of this circuit?

Design Frequency to Voltage Circuit of LM2907N

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. 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. 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.

So, can you give me any advice about the accuracy of the circuit?