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AX5243 Datasheet(PDF) 30 Page - ON Semiconductor |
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AX5243 Datasheet(HTML) 30 Page - ON Semiconductor |
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30 / 65 page  Circuit Description www.onsemi.com AX5243 30 Registers Register Bits Purpose PLLLOOP PLLLOOPBOOST FLT[1:0] Synthesizer loop filter bandwidth and selection of external loop filter, recommended usage is to increase the bandwidth for faster settling time, bandwidth increases of factor 2 and 5 are possible. PLLCPI PLLCPIBOOST Synthesizer charge pump current, recommended usage is to decrease the bandwidth (and improve the phase-noise) for low data-rate transmissions. PLLVCODIV REFDIV Sets the synthesizer reference divider ratio. RFDIV Sets the synthesizer output divider ratio. VCOSEL Selects either the internal or the external VCO. VCO2INT Selects either the internal VCO inductor or an external inductor between pins L1 and L2. FREQA, FREQB Programming of the carrier frequency PLLRANGINGA, PLLRANGINGB Initiate VCO auto-ranging and check results |
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