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CC2500-RTR1 数据表(PDF) 11 Page - Texas Instruments |
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CC2500-RTR1 数据表(HTML) 11 Page - Texas Instruments |
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11 / 84 page  CC2500 PRELIMINARY Data Sheet (Rev.1.2) SWRS040A Page 11 of 83 4.5 Low Power RC Oscillator Tc = 25 °C, VDD = 3.0 V if nothing else stated. All measurement results obtained using the CC2500EM reference design. Parameter Min Typ Max Unit Condition/Note Calibrated frequency 34.6 34.7 36 kHz Calibrated RC Oscillator frequency is XTAL frequency divided by 750 Frequency accuracy after calibration +0.3 -10 % The RC oscillator contains an error in the calibration routine that statistically occurs in 17.3% of all calibrations performed. The given maximum accuracy figures account for the calibration error. Refer also to the CC2500 Errata Note. Temperature coefficient +0.4 % / °C Frequency drift when temperature changes after calibration Supply voltage coefficient +3 % / V Frequency drift when supply voltage changes after calibration Initial calibration time 2 ms When the RC Oscillator is enabled, calibration is continuously done in the background as long as the crystal oscillator is running. Table 8: RC oscillator parameters 4.6 Frequency Synthesizer Characteristics Tc = 25 °C, VDD = 3.0 V if nothing else stated. All measurement results obtained using the CC2500EM reference design. Parameter Min Typ Max Unit Condition/Note Programmed frequency resolution 397 FXOSC/ 2 16 412 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. –78 dBc/Hz @ 50 kHz offset from carrier –78 dBc/Hz @ 100 kHz offset from carrier –81 dBc/Hz @ 200 kHz offset from carrier –90 dBc/Hz @ 500 kHz offset from carrier –100 dBc/Hz @ 1 MHz offset from carrier –108 dBc/Hz @ 2 MHz offset from carrier –116 dBc/Hz @ 5 MHz offset from carrier RF carrier phase noise –127 dBc/Hz @ 10 MHz offset from carrier PLL turn-on / hop time 88.4 µs Time from leaving the IDLE state until arriving in the RX, FSTXON or TX state, when not performing calibration. Crystal oscillator running. PLL RX/TX settling time 9.6 µs Settling time for the 1·IF frequency step from RX to TX PLL TX/RX settling time 21.5 µs Settling time for the 1·IF frequency step from TX to RX PLL calibration time 0.69 18739 0.72 0.72 XOSC cycles ms Calibration can be initiated manually, or automatically before entering or after leaving RX/TX. Min/typ/max time is for 27/26/26 MHz crystal frequency. Table 9: Frequency synthesizer parameters |
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