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CC2550 Datasheet(PDF) 7 Page - Texas Instruments |
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CC2550 Datasheet(HTML) 7 Page - Texas Instruments |
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7 / 59 page  CC2550 SWRS039B Page 7 of 58 4.3 Crystal Oscillator Tc = 25 °C, VDD = 3.0 V if nothing else stated. All measurement results obtained using the CC2550EM reference design ([3]). Parameter Min Typ Max Unit Condition/Note Crystal frequency 26 26 27 MHz Tolerance ±40 ppm This is the total tolerance including a) initial tolerance, b) crystal loading, c) aging and d) temperature dependence. The acceptable crystal tolerance depends on RF frequency and channel spacing / bandwidth. ESR 100 Ω Start-up time 150 µs Measured on CC2500EM reference design ([3]) using crystal AT-41CD2 from NDK. This parameter is to a large degree crystal dependent. Table 6: Crystal Oscillator Parameters 4.4 Frequency Synthesizer Characteristics Tc = 25 °C, VDD = 3.0 V if nothing else stated. All measurement results obtained using the CC2550EM reference design ([3]). Min figures are given using a 27 MHz crystal. Typ and max figures are given using a 26 MHz crystal. Parameter Min Typ Max Unit Condition/Note Programmed frequency resolution 397 FXOSC/ 2 16 427 Hz 26-27 MHz crystal. Synthesizer frequency tolerance ±40 ppm Given by crystal used. Required accuracy (including temperature and aging) depends on frequency band and channel bandwidth / spacing. –74 dBc/Hz @ 50 kHz offset from carrier –74 dBc/Hz @ 100 kHz offset from carrier –77 dBc/Hz @ 200 kHz offset from carrier –97 dBc/Hz @ 1 MHz offset from carrier –106 dBc/Hz @ 2 MHz offset from carrier –114 dBc/Hz @ 5 MHz offset from carrier RF carrier phase noise @2440 MHz –117 dBc/Hz @ 10 MHz offset from carrier PLL turn-on / hop time 85.1 88.4 88.4 µs Time from leaving the IDLE state until arriving in the FSTXON or TX state, when not performing calibration. Crystal oscillator running. PLL calibration time 694 721 721 µs Calibration can be initiated manually or automatically before entering or after leaving RX/TX. Table 7: Frequency Synthesizer Parameters |
Similar Part No. - CC2550_11 |
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Similar Description - CC2550_11 |
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