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0 - 10VDC input/0 - 2kHz Output circuit/chip wanted

Discussion in 'Electronic Design' started by PT, Nov 23, 2003.

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  1. PT

    PT Guest

    Hi to all,

    Anyone have any ideas where I could get my hands on something like the
    above?

    Thanks in advance.
     
  2. Think about what your asking...

    0 Hertz?
    0 DC?

    How about a reasonable range of voltage and frequency?

    What granularity? 2,000 Hz/10 V is a LOT of possibilities of adjustment.

    Sine wave? TTL? what?
    --
    *
    | __O Thomas C. Sefranek
    |_-\<,_ Amateur Radio Operator: WA1RHP
    (*)/ (*) Bicycle mobile on 145.41, 448.625 MHz

    http://hamradio.cmcorp.com/inventory/Inventory.html
    http://www.harvardrepeater.org
     
  3. Tweetldee

    Tweetldee Guest


    Do a Google search for "voltage to frequency converter". There should be
    several references that will answer your question. The LM331 from National
    and the AD537 from Analog Devices are notable in that area.
    I don't think that you'll get true 0 Hz out for 0V in, but it can get close.

    --
    Tweetldee
    Tweetldee at att dot net (Just subsitute the appropriate characters in the
    address)

    Never take a laxative and a sleeping pill at the same time!!
     
  4. Ben Bradley

    Ben Bradley Guest

    This would also be called a voltage controlled oscillater. If
    off-the-shelf solutions don't seem accurate enough for your needs,
    check out Bob Pease's columns in Electronic Design (on the web
    somewhere - use Google), in one column he had a 'very accurate' VCO
    schematic.
    You CAN do that reliably, if you add an offset to the input so that
    it doesn't start oscillating until you apply 10mV or 100mV or so...
     
  5. GPG

    GPG Guest

  6. PT

    PT Guest

    Yes you are right - it's actually not that critical, maybe as much as 100hz
    at start-up would be ok. Output can be Schmitted so no worries about
    waveform.

    Most important aspect though is linearity.

    Cheers, Paul.
     
  7. PT

    PT Guest

    Thanks, I have read that the AD537 is better than the LM331. Any
    experiences, anyone.

    Cheers, Paul.
     
  8. Da Man

    Da Man Guest

    Check out a LT1043

    http://www.linear.com/prod/datasheet.html?datasheet=178
     
  9. Ban

    Ban Guest

    Tweetldee wrote:
    ||
    || Never take a laxative and a sleeping pill at the same time!!

    No problem tweet, but this time don't forget to put your nappies.
     
  10. Paul

    Paul Guest

    Have a look at the AD 654JN (analog devices)

    Be careful around 0v though , as the results can be unpredictable
     
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