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TRF1221 Fref problems

Hello.

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?

Thank,s