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.

 

Hello,

That will be hard to find.
A 74hct4046 (a 4046 derivative) will come the most close:
http://search.digikey.com/us/en/products/CD74HCT4046AM/296-9275-5-ND/376938
It will go upto 38 Mhz.

Bertus

 

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

 

Hello,

That will be hard to find.
A 74hct4046 (a 4046 derivative) will come the most close:
http://search.digikey.com/us/en/products/CD74HCT4046AM/296-9275-5-ND/376938
It will go upto 38 Mhz.

Bertus

It is a PLL with VCO. I want just a VCO. Thanks for your help.

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

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.

 

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.

 

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")

http://www.minicircuits.com/products/Oscillators.shtml

 

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?

 

The 74S124 dual TTL VCO I.C. is still around and can operate up to 60 Mhz. Check it out.

 

The 74S124 dual TTL VCO I.C. is still around and can operate up to 60 Mhz. Check it out.

It is far from clear that a digital part will be suitable for the intended application. It has now been over a decade since the post before yours and since the TS was last seen.