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Frequency Counter Chip

Discussion in 'Electronic Design' started by Chaozhou, Sep 17, 2003.

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  1. Chaozhou

    Chaozhou Guest

    Does anyone know of a good frequency counter on an IC? I need one for a
    project I'm working on. Thanks.
     
  2. 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
     
  3. repatch

    repatch Guest

    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
     
  4. 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.
     
  5. 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.
     
  6. Rick

    Rick Guest

    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.
     
  7. scada

    scada Guest

    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.
     
  8. porter

    porter Guest


    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.
     
  9. Chaozhou

    Chaozhou Guest

    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?
     
  10. 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
     
  11. 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...
     
  12. Paul Burke

    Paul Burke Guest

    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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