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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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.

As I want to know the attached circuit is correct as what you mention? That range can give me a larger range to have a more accuracy signal to do speed control. I have followed the datasheet of LMN to design a frequency to voltage circuit.

So, what can I do. By continuing to use this site, you are consenting to our use of cookies.

National Semiconductor

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. The two basic configurations offered include an 8-pin device. Sorry, can anybody give me advice or the circuit is correct or any incorrect place? But I still cannot be sucessful to dataseet a larger voltage output range. So, can you give me any advice about the accuracy of the circuit?


Can any professional give me a design which can achive a higher range of output, e. Click here to register now.

The more versatile configurations provide differential ta- chometer input and uncommitted op amp inputs. National Semiconductor Electronic Components Datasheet. LM – 8 pin package As you show the 8 pin package circuit, I assume this is what you have – there is a 14 pin version as well.

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LM2907N Datasheet PDF

To do better requires more info – supply voltage, rest of circuit components? This version is well suited for single speed or frequency switching or fully buffered frequency to voltage conversion applications. You must log in or register to reply here. As i read from d’sheet it can’t do this. Other than that you said the circuit worked, just gave the wrong rangethe diagram you posted is correct, the vaues should be OK.

This feature allows either a ground or supply referred load of up to 50 mA. This version is well suited for single. Klaus New Member Jul 3, Articles Top Articles Search resources.

National Semiconductor – datasheet pdf

You can then drive the transistor to give you an output of up to Vcc. Frequency to Voltage Converter. Also, I need to be very conservative wrt adding components. It only can be varying within V output for 40Hz input.


BUT As the circuit will lose some voltage it will stop short of 12v out. The more versatile configurations provide differential ta. Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at This is important as the input signal MUST cross this zero volt threshold:!: Welcome to our site!

The 8 pin package has the op-amp input stage’s dataseet input connected to ground via pin 8the non-inverting input is on pin 1. Also, the ripple of the output will affect the output range or not? 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.

LMN datasheet, Pinout ,application circuits Frequency To Voltage Converter

But I need 10khz to 40khz give me a 0 volt – Vcc variation. The input signal must therefore go positive AND negative for the circuit to work. Stick with the LM I’m sure the Datasheey is capable of doing what you want, it just needs some component changes to set the range.

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