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AX5051 Datasheet(PDF) 9 Page - ON Semiconductor |
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AX5051 Datasheet(HTML) 9 Page - ON Semiconductor |
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9 / 28 page  AX5051 www.onsemi.com 9 Table 7. RF FREQUENCY GENERATION SUBSYSTEM (SYNTHESIZER) Symbol Description Condition Min Typ Max Units fREF Reference frequency Note 1 16 24 MHz frange_hi Frequency range BANDSEL = 0 800 940 MHz frange_low BANDSEL = 1 400 470 fRESO Frequency resolution 1 Hz BW1 Synthesizer loop bandwidth VCO current: VCOI = 001 Loop filter configuration: FLT = 01 Charge pump current: PLLCPI = 010 100 kHz BW2 Loop filter configuration: FLT = 01 Charge pump current: PLLCPI = 001 50 BW3 Loop filter configuration: FLT = 11 Charge pump current: PLLCPI = 010 200 BW4 Loop filter configuration: FLT = 10 Charge pump current: PLLCPI = 010 500 Tset1 Synthesizer settling time for 1 MHz step as typically required for RX/TX switching VCO current: VCO_I = 001 Loop filter configuration: FLT = 01 Charge pump current: PLLCPI = 010 15 ms Tset2 Loop filter configuration: FLT = 01 Charge pump current: PLLCPI = 001 30 Tset3 Loop filter configuration: FLT = 11 Charge pump current: PLLCPI = 010 7 Tset4 Loop filter configuration: FLT = 10 Charge pump current: PLLCPI = 010 3 Tstart1 Synthesizer start−up time if crystal oscillator and reference are running VCO current: VCO_I = 001 Loop filter configuration: FLT = 01 Charge pump current: PLLCPI = 010 25 ms Tstart2 Loop filter configuration: FLT = 01 Charge pump current: PLLCPI = 001 50 Tstart3 Loop filter configuration: FLT = 11 Charge pump current: PLLCPI = 010 12 Tstart4 Loop filter configuration: FLT = 10 Charge pump current: PLLCPI = 010 5 PN8681 Synthesizer phase noise Loop filter configuration: FLT = 01 Charge pump current: PLLCPI = 010 VCO current: VCO_I = 001 868 MHz, 50 kHz from carrier −85 dBc/Hz 868 MHz, 100 kHz from carrier −90 868 MHz, 300 kHz from carrier −100 868 MHz, 2 MHz from carrier −110 PN4331 433 MHz, 50 kHz from carrier −90 433 MHz, 100 kHz from carrier −95 433 MHz, 300 kHz from carrier −105 433 MHz, 2 MHz from carrier −115 PN8682 Synthesizer phase noise Loop filter configuration: FLT = 01 Charge pump current: PLLCPI = 001 VCO current: VCO_I = 001 868 MHz, 50 kHz from carrier −80 dBc/Hz 868 MHz, 100 kHz from carrier −90 868 MHz, 300 kHz from carrier −105 868 MHz, 2 MHz from carrier −115 PN4332 433 MHz, 50 kHz from carrier −90 433 MHz, 100 kHz from carrier −95 433 MHz, 300 kHz from carrier −110 433 MHz, 2 MHz from carrier −122 1. ASK, PSK and 0.1−200 kbps FSK with 16 MHz crystal, 200−350 kbps FSK with 24 MHz crystal. |
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