Converting an input frequency into a voltage output?

[Avatar1]

As the title states guys, i'm having a bit of trouble finding the best and easiest way for turning a frequency into an output voltage.

This input frequency would be variable, (between about 2KHz-4KHz) and would be for input to a processor eventually to give an output reading for a 7 segment display.

Could anyone give some advice on how to make a circuit that will achieve the above challenge?

Any help would be greatly appreciated!

Mark

 

[MikeMl]

If it is going into the processor, just use a timer to count cpu clocks between up or down edges of the input signal. No external electronics is required.

 

[Roff]

Is the variable frequency signal digital? If not, what is the amplitude and waveform?

 

[tcmtech]

The LM2907 is a standard issue frequency to voltage converter IC. It is probably what would work for your needs.

 

[MikeMl]

The LM2907 is a standard issue frequency to voltage converter IC. It is probably what would work for your needs.

But why convert a frequency into a varying analog voltage which then has to be A/Ded to read by his ucontroller? Just turn it into a digital wave and feed it into a port pin on the ucontroller, and let the ucontroller measure the period.