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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But I need 10khz to 40khz give me a 0 volt – Vcc variation. 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 datasheef set to the desired time constant then the op amp can give lots of gain.

Click here to register now. The more versatile configurations provide differential ta. I have made the circuit but seem not work. Can any professional give me a design which can achive a higher range of output, e. The LM, LM series are monolithic frequency to. I’m satasheet to sense the freq of a square wave from 10KHz – 40KHz range.

Klaus New Member Jul 3, To do better requires datasheeet info – supply voltage, rest of circuit components?

The tachom- eter uses a charge pump technique and offers frequency doubling for low ripple, full input protection in two versions LM, LM dataseet its output swings to ground for a zero frequency input. You can then drive the transistor to give you an output of up to Vcc. Any suggestions on how to implement that? By continuing to use this site, you are consenting to our use of cookies.


Why not connect the output to a transistor base. Adding 2 more ics to do the trick is not an option.

Design Frequency to Voltage Circuit of LM2907N

Other than that you said the circuit worked, just gave the wrong rangethe diagram you posted is correct, the vaues should be OK. 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.

Sorry, can you give me any advice of which type can do such thing? Also, the ripple of the output will affect the output range or not? Don’t worry about calculating the R1,C1,C2 values. BUT As the circuit will lose some voltage it will stop short of 12v out. Articles Top Articles Search resources. With this version the tachometer input may be floated and the op amp becomes suitable for active filter conditioning of the tachom- eter output.

Sebi Active Member Jul 2, But i want to know the accuracy of lm2907j circuit?

LMN Datasheet(PDF) – TI store

Thank you for your reply. The regulator clamps the supply such that stable frequency to voltage and frequency to current operations are possible with any supply voltage and a suitable resistor.

I don’t know why. This version is well suited lm2907b single. That range can give datassheet a larger range to have a more accuracy signal to do speed control. Welcome to our site! You must log in or register to reply here. I am before use the below circuit and it work. LM, LM and its output swings to ground for a.


Replacing a 4 pin leaded inductor with a 2 pin Datsaheet by gkmaia Yesterday at I have followed the datasheet of LMN to design a frequency to voltage circuit. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.

Or any other methods can achieve the task? It only can be varying within V output for 40Hz input.

LMN Datasheet(PDF) – TI store

Thank you very much. Now I understand the chip gives datsaheet a 0volts to Vcc variation for 0 Hz to fmax. To participate you need to register. This op-amp works as a sort of ‘trip amp’, whenever the input on pin 1 exceeds the voltage on pin 8 0vthe output to the charge pump will go high, being low at all other times. Potentiometer Questions Started by norbss Yesterday at This is important as the input signal MUST cross this zero volt threshold:!: This version is well suited for single speed or frequency switching or fully buffered frequency to voltage conversion applications.

But I still cannot be sucessful to make a larger voltage output range.

Frequency To Voltage Converter

Media New media New comments Search media. Forums New posts Search forums. Both of these configurations are available with an active shunt regulator ,m2907n across the power leads. As i read from d’sheet it can’t do this. 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.