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?
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
Cheers
PeteS
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