CC2500RGPR Datasheet, PDF (13/99 Pages) Texas Instruments – Low-Cost Low-Power 2.4 GHz RF Transceiver

CC2500
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
([4]). 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/
412
2¹⁶
Hz 26-27 MHz crystal.
Synthesizer frequency
±40
tolerance
ppm Given by crystal used. Required accuracy (including
temperature and aging) depends on frequency band and
channel bandwidth / spacing.
RF carrier phase noise
–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
–114
dBc/Hz @ 5 MHz offset from carrier
–118
dBc/Hz @ 10 MHz offset from carrier
PLL turn-on / hop time 85.1 88.4 88.4
s 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
9.3
9.6
9.6
s Settling time for the 1·IF frequency step from RX to TX
PLL TX/RX settling
time
20.7 21.5 21.5
s Settling time for the 1·IF frequency step from TX to RX
PLL calibration time
694 721
721
s Calibration can be initiated manually or automatically
before entering or after leaving RX/TX.
Table 9: Frequency Synthesizer Parameters
SWRS040C
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