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Frequency Counter Chip

C

Chaozhou

Jan 1, 1970
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Does anyone know of a good frequency counter on an IC? I need one for a
project I'm working on. Thanks.
 
R

Robert Lacoste

Jan 1, 1970
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Chaozhou said:
Does anyone know of a good frequency counter on an IC? I need one for a
project I'm working on. Thanks.

These days the cheapest solution is very probably a microcontroller, using
the onboard timers... but it all depends on the frequency range/resolution
you are looking for...

Yours,
Robert Lacoste - ALCIOM
http://www.alciom.com
 
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repatch

Jan 1, 1970
0
Don't know of a single chip solution other then a microcontroller, very
trivial to create, aside from the input electronics, which can be trivial
depending on what you want to do. TTYL
 
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Eugene Rosenzweig

Jan 1, 1970
0
You can achieve this quite easily with a PIC - TIMER0 has a mode where it is
incremented by an positive/negative edge on one of the pins...
Thats a counter and if sampled at certain intervals, a frequency counter.
 
T

Tom Del Rosso

Jan 1, 1970
0
Robert said:
These days the cheapest solution is very probably a microcontroller,
using the onboard timers... but it all depends on the frequency
range/resolution you are looking for...

The old Intersil chips (7216, 7226, etc) were never updated since 25
years ago, and they were only 10 MHz, so strangely enough a
microcontroller of today could do nearly as well.
 
R

Rick

Jan 1, 1970
0
Does anyone know of a good frequency counter on an IC? I need one for a
project I'm working on. Thanks.

Check out

www.maxim-ic.com

and search for MAX7224 and MAX7225. These are 4 1/2 digit, up to
25MHz, can be cascaded for more digits. One drives an LCD, the other
LED's.

Rick.
 
S

scada

Jan 1, 1970
0
Chaozhou said:
Does anyone know of a good frequency counter on an IC? I need one for a
project I'm working on. Thanks.

I just had a look into my parts bin, found an IC I bought for a project that
never came about! It's Intersil's ICM7226A/B. It covers DC to 10MHZ, 8 digit
readout, just a few descrete components needed, a couple resistors, caps,
10MHZ crystal. The data sheet shows how to add two ECL11C90 chips to make it
a 100MHZ Muti Function Counter.
 
P

porter

Jan 1, 1970
0
Chaozhou said:
Does anyone know of a good frequency counter on an IC? I need one for a
project I'm working on. Thanks.


Intersil 7217 programmable 4 digit up down counter or 7226 8 digit
universal counter. The 7226 requires very little support circuitry for
frequency counter apps. The 7217 is nicely adapted for digital
frequency readouts for radio tuners because you can load an
appropriate number to subtract from the local oscillator frequency.
 
C

Chaozhou

Jan 1, 1970
0
Eugene said:
You can achieve this quite easily with a PIC - TIMER0 has a mode where it is
incremented by an positive/negative edge on one of the pins...
Thats a counter and if sampled at certain intervals, a frequency counter.

Hmm...this might be a better idea. I want a wider frequency range than the PIC
can handle though. Know of any good prescalers out there?
 
R

Robert Monsen

Jan 1, 1970
0
Chaozhou said:
Hmm...this might be a better idea. I want a wider frequency range than the PIC
can handle though. Know of any good prescalers out there?

The PIC technote I posted claims they can do up to 50MHz, since timer0 is
asyncronous. However, I haven't read the thing in detail.

Regards,
Bob Monsen
 
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Eugene Rosenzweig

Jan 1, 1970
0
Robert Monsen said:
the

The PIC technote I posted claims they can do up to 50MHz, since timer0 is
asyncronous. However, I haven't read the thing in detail.

Regards,
Bob Monsen

Thats not bad if it can do it. If you still need a prescaler and it does not
have to be anything fancy you can make one up from a D-type flip-flop - 1:2
or a dual D-type 1:4 etc...
 
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Paul Burke

Jan 1, 1970
0
Chaozhou said:
Eugene Rosenzweig wrote:




Hmm...this might be a better idea. I want a wider frequency range than
the PIC
can handle though. Know of any good prescalers out there?

How high do you want? What kind of count range? Would a PLD clocked at
50MHz be fast enough? 64 cell Xilinx Coolrunner is about £2.50 in small
quantities. (That's a guess on the speed by the way, it can be clocked
much faster but the counter internals will limit the actual speed
attainable.)

Paul Burke
 
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