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 still cannot be sucessful to make a larger voltage output range. It only can be varying within V output for 40Hz input. Can any professional give me a design which can achive a higher range of output, e. That range can ml2907n me a larger range to have a more accuracy signal to do speed control. Also, the ripple of the output will affect the output range or not?
LMN Datasheet(PDF) – National Semiconductor (TI)
Thank you very much. Sebi Active Member Jul 2, As i read from d’sheet it can’t do this. Sorry, can you give me any advice of which type can do such thing?
Or any other methods can achieve the task? Thank you a lot. Klaus New Member Jul 3, Why not connect the output to a transistor base.
You can then drive the transistor to give you an output of up to Vcc. Stick with the LM I’m sure the LM is datasneet of doing what you want, it just needs some component changes to set the range. 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. BUT As the circuit will lose some voltage it will stop short of 12v out. To do better requires more info – supply voltage, rest of circuit components?
Thank you for your reply. As I want to know the attached circuit is correct as what you mention? But i want to know the accuracy of this circuit? So, can you give me any advice about the accuracy of the circuit? Sorry, can anybody give me advice or the circuit is correct or any incorrect place? LM – 8 pin package As km2907n show the 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. 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. This is important as the input signal MUST cross this zero volt threshold:!: The input signal must therefore go positive AND negative for the circuit to work.
Other than that you said the circuit worked, just gave the wrong rangethe diagram you posted is correct, the vaues should be OK. I have made the circuit but seem not work. I don’t know why. I am before use the below circuit and it work.
LM2907N Datasheet PDF
So, what can I do. I’m trying to sense the freq of a square wave from 10KHz – 40KHz range. Now I understand the chip gives you a 0volts to Vcc variation for 0 Hz to fmax. But I need 10khz to 40khz give me a 0 volt – Vcc variation. Any suggestions on how to implement that? Also, I need to be very conservative wrt adding components. Adding 2 more ics to do the trick is not an option. Don’t worry about calculating the R1,C1,C2 values. You must log in or register to reply here.