Any VCO IC working in 20MHz - 40MHz range?

Discussion in 'General Electronics Chat' started by dumindu89, Mar 4, 2012.

  1. dumindu89

    Thread Starter Member

    Oct 28, 2010
    I want a VCO which is working in 20MHz - 40 MHz range. If you know such IC in TTL family please let me know the IC number.
  2. bertus


    Apr 5, 2008
  3. MrChips


    Oct 2, 2009
    74LS124, 74LS324, 74LS624 - 74LS629
    to 20MHz, maybe short of your range.
    You could add a frequency doubler or phase-locked loop.
  4. dumindu89

    Thread Starter Member

    Oct 28, 2010
    It is a PLL with VCO. I want just a VCO. Thanks for your help.

    Thanks. But I found a better one by dropping the L of "74LS124". :) It is SN74S124
    Can anyone tell me a VCO IC that work in FM broadcasting band too? But is should has a DIP package with through hole mounting.
    Last edited: Mar 4, 2012
  5. MrChips


    Oct 2, 2009
    I had forgotten about the 74S124 which I have used in the past.

    The specs give a max freq of 60MHz while the description says 85MHz which is just shy of the FM band.

    Again, a frequency doubler or phase-looked loop should do the trick.
  6. Eskelvar

    New Member

    Mar 4, 2012
    On the Mini-Circuit company website they have a "POS-ED8475" I do not know if this would meet your need or not, but it is a VCO for 20MHz-40MHz and comes in more then one package (surface mount, connector, or Plug in "DIP")
  7. Papabravo


    Feb 24, 2006
    I kinda doubt that a mini-circuit is going to be like a TTL part. It is going to look more like an RF-module requiring careful layout and impedance matching.

    I tried entering that number (POS-ED8475) on the mini-circuits website and it returned no results. Why are you wasting our time with a bogus link?

    Take the JTOS-50 which operates from a Vcc of 12 volts, covers 25-47 MHz, has at tuning voltage from 1-15 volts, and puts out +8.5dBm

    Question: What is the peak to peak output voltage at an RMS current of 12 mA? If you had to think about it too hard, this part is probably not for you.
    Question: What is the output impedance of the "RF output" on pin-13?

    BTW What is the application for the VCO?
    Last edited: Mar 8, 2012