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Command PLL circuit via computer

Discussion in 'General Electronics' started by Damien Teney, Jul 27, 2003.

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  1. Damien Teney

    Damien Teney Guest

    Hello,
    I'm building a VHF receiver and I would like to include a PLL circuit to
    control the VCO. I've never done it before, so I would like to use the
    LMX2337 because I've a lot of doc about it. I intend to to connect it to my
    computer, but I don't know to send data to it. Do you know if there are
    programs to do it ? or could you help me ?

    Thanks a lot.

    http://www.national.com/ds/LM/LMX2337.pdf
     
  2. Rich Webb

    Rich Webb Guest

    Well, you could probably bit-twiddle a parallel port to do this but
    you'd probably also want to include opto-isolators between the PC and
    the chip to avoid close coupling between the RF device and your PC.

    What I'd recommend instead would be to embed a microcontroller in your
    design and talk to the micro from your PC over a regular RS-232 serial
    link. The microcontroller could take care of device initialization and
    control as well as perhaps running a front panel display or sending
    status information back to the PC.
     
  3. Damien Teney

    Damien Teney Guest

    Yep, but my goal was to avoid using a embedded microcontroller. However I've
    used google a lot this afternoon and I think I will use a PLL IC with
    parallel interface, that we can command via simple dip-switches. I think
    that's the easiest (and cheapest) way.
     
  4. I'm building a VHF receiver and I would like to include a PLL circuit to
    Isn't that the point of DDS ?
    Check the Analog Devices AD9850 on www.analog.com, and if you
    search for that same reference on the web you will find a small
    program for controlling it using the parallel port (I think DOS
    based).
    I was interfacing the AD9850 to an H8 microcontroller and tested
    the connexions to/from the AD9850 using DOS based and linux based
    control software controlling the parallel port. I can send these
    to you if necessary.

    Jean-Michel
     
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