Frequency to Voltage Converter

Discussion in 'The Projects Forum' started by Yoga Purna Tama, Jan 25, 2015.

  1. Yoga Purna Tama

    Thread Starter New Member

    Jan 25, 2015
    6
    0
    Hello everyone.

    im yoga from indonesia. im currently working on my final project. i need device that can convert frequency (up to 360 KHz) to voltage for my project. i tried LM 2907 but apparently it has maximum frequency around 2.5 Khz.

    is there another way for me to convert the frequency i need? what IC or Circuit should i use?


    thank you very much for any help...
     
  2. Reloadron

    Active Member

    Jan 15, 2015
    969
    235
    Have you looked at the Analog Devices AD650 F/V V/F chip? Also this should likely be in the school work / homework section of the forums.

    Ron
     
  3. alfacliff

    Well-Known Member

    Dec 13, 2013
    2,449
    428
    have you looked into integrator circuits?
     
  4. ronv

    AAC Fanatic!

    Nov 12, 2008
    3,293
    1,262
    I don't know what the minimum and maximum frequency you have is. You might be able to just lower your frequency with a divider to get it to work with your part.
     
  5. jjw

    Member

    Dec 24, 2013
    173
    31
    You can use a monostable multivibrator with a pulsewidth 1/fmax triggered with the signal and its output filtered with RC filter.
     
  6. Yoga Purna Tama

    Thread Starter New Member

    Jan 25, 2015
    6
    0
    can you give me a link about it? sorry im very amateur about this
     
  7. Yoga Purna Tama

    Thread Starter New Member

    Jan 25, 2015
    6
    0
    the minimum frequency is about 30KHz and maximum 360KHz. any tips?
     
  8. Rory Starkweather

    Member

    Jan 27, 2015
    41
    4
    This might be more expensive than your whole project, but, have you considered an x30000 frequency divider? It would drop your frequency range to the 1-12 Hz range. Would the rest of your circuit work with that?
     
  9. Reloadron

    Active Member

    Jan 15, 2015
    969
    235
    Yeah, did you look at the data sheet link I posted in post #2?

    Ron
     
  10. Yoga Purna Tama

    Thread Starter New Member

    Jan 25, 2015
    6
    0
    hello ron. i already read the datasheet but i cant figure out how to use it. i mean the maximum frequency input or the vpp input. because i use function generator for the input. am i getting wrong? thank you for your help
     
  11. Reloadron

    Active Member

    Jan 15, 2015
    969
    235
    The simple solution would have been a nice simple F/V Module, you can try a Google of "Frequency to Voltage Module" and see what you find but I didn't have much luck above 50 KHz or so. The Analog Devices chip I suggested would require building a board for it and the board would need built to tight specifications. The chip requires external components and mounting can be critical. I believe the problem you will face is while your frequencies are hardly what I would call High Frequency they are high enough that most over the counter modules I have seen won't do it.

    Maybe another member has a thought for F/V conversion of 30KHz to 350 KHz = 0 to 5V?

    Ron
     
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