Xtal/chip combo for 60 Hz ?

Discussion in 'Electronic Design' started by Guest, May 14, 2004.

  1. Guest

    Guest Guest

    Is there a commonly available crystal and divider chip combination to
    generate 60 Hz?
    Guest, May 14, 2004
    #1
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  2. Guest

    Rich Grise Guest

    <> wrote in message
    news:c2Fnb2JvZw==...
    > Is there a commonly available crystal and divider chip combination to
    > generate 60 Hz?
    >

    Yes, but it's so much simpler and cheaper to use the line freq., if it's
    60 Hz in your area. Long-term more stable, too. Remember electric clocks?
    They used to use the line freq - they actually had a little synchronous
    motor.

    Otherwise, find a crystal that's on a 2^n multiple of 60 Hz, and divide
    it down with a 4060.

    Cheers!
    Rich
    Rich Grise, May 14, 2004
    #2
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  3. Guest

    Steven Swift Guest

    (Steven Swift) writes:

    >from the line or using a binary crystal such as 4.194304MHz with a
    >CD4060, but very nice if you want to generate a perfect 60Hz.


    Whoops, that was to get 1Hz, need a multiple of 60.

    But the RM works.

    Steve.
    --
    Steven D. Swift, , http://www.novatech-instr.com
    NOVATECH INSTRUMENTS, INC. P.O. Box 55997
    206.301.8986, fax 206.363.4367 Seattle, Washington 98155 USA
    Steven Swift, May 14, 2004
    #3
  4. Guest

    John Fields Guest

    On Fri, 14 May 2004 21:39:36 GMT, "Rich Grise" <>
    wrote:

    ><> wrote in message
    >news:c2Fnb2JvZw==...
    >> Is there a commonly available crystal and divider chip combination to
    >> generate 60 Hz?
    >>

    >Yes, but it's so much simpler and cheaper to use the line freq., if it's
    >60 Hz in your area. Long-term more stable, too.


    ---
    Unfortunately, short-term it sometimes goes to zero Hz.
    ---

    >Remember electric clocks?
    >They used to use the line freq - they actually had a little synchronous
    >motor.
    >
    >Otherwise, find a crystal that's on a 2^n multiple of 60 Hz, and divide
    >it down with a 4060.



    4060 ÷ f XTAL COMMONLY AVAILABLE?
    OUTPUT N Hz DIGI-KEY
    --------+------+-------+--------------------
    Q3 8 480 NO
    Q4 16 960 NO
    Q5 32 1920 NO
    Q6 64 3840 NO
    Q7 128 7680 NO
    Q8 256 15360 NO
    Q9 512 30720 NO
    Q11 2048 122880 NO
    Q12 4096 345760 NO
    Q13 8192 691520 NO

    --
    John Fields
    John Fields, May 14, 2004
    #4
  5. Guest

    CFoley1064 Guest

    >Subject: Xtal/chip combo for 60 Hz ?
    >From:
    >Date: 5/14/2004 3:20 PM Central Standard Time
    >Message-id:
    ><c2Fnb2JvZw==>
    >
    >Is there a commonly available crystal and divider chip combination to
    >generate 60 Hz?
    >


    Of course, the customary solution for this is to use the 60 Hz line frequency
    to do this. Otherwise, the customary answer is to generate an interrupt off of
    your microcontroller timer/counter using the crystal-based uC clock frequency.
    But somehow, I don't think that's what you're looking for.

    Given that, I don't think there's a one-chip solution that will get you where
    you want to go. An older UART crystal frequency of 1.2288 MHz will get you a
    two-chip solution (view in fixed font or M$ Notepad):

    60 Hz From Crystal or Oscillator
    .-----------------.
    | | .--------------.
    ..-----o-----. | | | |
    | | | CLK /2^11| | |
    | 1.2288MHz o----o CD4040 o------oCLK |
    | | | | | CD4017 |
    | | | | | |
    '-----o-----' | | .-oEN |
    | | | | |
    | | | | OUT/10 |
    | | | '-------o------'
    '-----------------' | |
    === |
    GND |
    |
    |
    o
    60 Hz
    Squarewave

    A cursory scan doesn't show any crystals at this frequency from the usual
    hobbyist suspects, but you can get a full-size TTL/CMOS-compatible clock
    oscillator at this frequency from Mouser for $1.50 USD from Mouser (P/N
    520-TCF122). Have fun.

    Good luck
    Chris
    CFoley1064, May 15, 2004
    #5
  6. <> wrote
    > Is there a commonly available crystal and divider chip combination to
    > generate 60 Hz?


    You don't mention how accurate of a source that you need. A PIC, some
    simple code and virtually any crystal could do it quite well.
    Anthony Fremont, May 15, 2004
    #6
  7. <> wrote in message
    news:c2Fnb2JvZw==...
    > Is there a commonly available crystal and divider chip combination to
    > generate 60 Hz?


    You don't mention how accurate of a source that you need. A PIC, some
    simple code and virtually any crystal could do it quite well.
    Anthony Fremont, May 15, 2004
    #7
  8. Guest

    budgie Guest

    On Fri, 14 May 2004 16:20:36 -0400 (EDT), <> wrote:

    >Is there a commonly available crystal and divider chip combination to
    >generate 60 Hz?


    There USED_TO_BE a standard Fairchild chip -a 5369 (forget the prefix, and the
    suffix brings up different output freqs) that went from a colour burst crystal
    freq to line freq. Oscillator on chip.

    Here in .au, where the line is 50Hz and the colour burst xtal is 3.579545 and a
    bit, the -EYRN suffix chip was the deal.
    budgie, May 15, 2004
    #8
  9. Guest

    Rich Grise Guest

    Rich Grise, May 15, 2004
    #9
  10. Guest

    Rich Grise Guest

    And a 74HCU04 for the oscillator.
    :)

    "Rich Grise" <> wrote in message
    news:Zdwpc.202855$...
    > "John Fields" <> wrote in message
    > news:...
    > > On Fri, 14 May 2004 21:39:36 GMT, "Rich Grise" <>
    > > >Otherwise, find a crystal that's on a 2^n multiple of 60 Hz, and divide
    > > >it down with a 4060.

    > > 4060 ÷ f XTAL COMMONLY AVAILABLE?
    > > OUTPUT N Hz DIGI-KEY
    > > Q13 8192 691520 NO

    >
    > OK, a 6.000000MHz crystal (digi-key CTS CTX605-ND
    > http://dkc3.digikey.com/PDF/T042/0685.pdf )
    > and 2.5x 74HC390
    >

    http://www.semiconductors.philips.com/acrobat/datasheets/74HC_HCT390_CNV_2.pdf
    >
    > Better?
    >
    > Cheers!
    > Rich
    >
    >
    Rich Grise, May 15, 2004
    #10
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