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PLL

Discussion in 'Misc Electronics' started by [email protected], Oct 17, 2005.

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  1. Guest

    I was wondering if anyone knows how the N divider worked on the
    Motorola PLL Frequency Synth MC145151-2. It has pins N0-N13. I am
    trying to input a 2kHz wave into the divider and compare it to a 1kHz
    ref freqeuncy. I would divide by two so I figured I would set N1 high
    and set the rest low. This does not seem to work. Any suggestions?
     
  2. PeteS

    PeteS Guest

    The datasheet is perfectly clear on the part.

    The device you have is designed for single modulus prescalers

    The output is given by (with no addition to the prescaler, T/R pin = 1)

    Fosc / (RefDiv) * prescalerDiv assuming you are driving Fin from a VCO
    (see the datasheet)

    Where RefDiv is specified on page 3 of the datasheet (RA2 - RA0) and
    prescalerDiv is a binary number with N0 as the least significant bit.

    Datasheet here

    http://www.freescale.com/files/rf_if/doc/data_sheet/MC145151-2.pdf

    Cheers

    PeteS
     
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