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?
PLL
Oct 17, 2005
1 Replies
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
formatting link
Cheers
PeteS
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