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AX5243 Datasheet(PDF) 9 Page - ON Semiconductor |
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AX5243 Datasheet(HTML) 9 Page - ON Semiconductor |
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9 / 42 page  AX5243 www.onsemi.com 9 Table 8. RF FREQUENCY GENERATION SUBSYSTEM (SYNTHESIZER) Symbol Description Condition Min Typ Max Units fREF Reference frequency The reference frequency must be chosen so that the RF carrier frequency is not an integer multiple of the reference frequency 10 16 50 MHz Dividers NDIVref Reference divider ratio range Controlled directly with register REFDIV 20 23 NDIVm Main divider ratio range Controlled indirectly with register FREQ 4.5 66.5 NDIVRF RF divider range Controlled directly with register RFDIV 1 2 Charge Pump ICP Charge pump current Programmable in increments of 8.5 mA via register PLLCPI 8.5 2168 mA Internal VCO (VCOSEL = 0) fRF RF frequency range RFDIV = 1 400 525 MHz RFDIV = 0 800 1050 fstep RF frequency step RFDIV = 1, fxtal = 16.000000 MHz 0.98 Hz BW Synthesizer loop bandwidth The synthesizer loop bandwidth and start−up time can be programmed with registers PLLLOOP and PLLCPI. For recommendations see the AX5243 Programming Manual, the AX−RadioLab software and AX5243 Application Notes on compliance with regulatory regimes. 50 500 kHz Tstart Synthesizer start−up time if crystal oscillator and reference are running 5 25 ms PN868 Synthesizer phase noise 868 MHz fREF = 48 MHz 10 kHz offset from carrier −95 dBc/Hz 1 MHz offset from carrier −120 PN433 Synthesizer phase noise 433 MHz fREF = 48 MHz 10 kHz offset from carrier −105 dBc/Hz 1 MHz offset from carrier −120 VCO with external inductors (VCOSEL = 1, VCO2INT = 1) fRFrng_lo RF frequency range For choice of Lext values as well as VCO gains see Figure 3 and Figure 4 RFDIV = 1 27 262 MHz fRFrng_hi RFDIV = 0 54 525 PN169 Synthesizer phase noise 169 MHz Lext=47 nH (wire wound 0603) RFDIV = 0, fREF= 16 MHz Note: phase noises can be improved with higher fREF 10 kHz from carrier −97 dBc/Hz 1 MHz from carrier −115 External VCO (VCOSEL = 1, VCO2INT = 0) fRF RF frequency range fully external VCO Note: The external VCO frequency needs to be 2 x fRF 27 1000 MHz Vamp Differential input amplitude at L1, L2 terminals 0.7 V VinL Input voltage levels at L1, L2 terminals 0 1.8 V Vctrl Control voltage range Available at FILT in external loop filter mode 0 1.8 V |
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