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RF & Digital Radio
High Performance RF Modulators, PLL and VCO products
High Performance RF Modulators, PLL and VCO products Forum
TRF1221 Fref problems
I am use TRF1221 PLL Synthesizer. In Data sheet reference frequency TYP 18MHz. No information about MIN and MAX Fref.
In our design common Fref 60MHz. I have any possibility of connection Fref to Chip. Direct connection 60MHz to Freg Port. In this case spectrum of low Freq.(300MHz) and high Freq(2700MHz) have split (multi spectrume arround central Freq.). So question. Can I use Fref 60MHz and how value of LPF components. Can I am divide by prescaler
the TCXCO 60MHz by 2 or 4 and then use as Fref?
Other Fref are possible but there is no reference divider. Changing the Fref frequency will change the step size of the VCO. Reference the datasheet for the formulae to calculate the frequency and step size. --RJH
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