Data Sheet
CC1101
SWRS061B Page 14 of 93
4.5 Low Power RC Oscillator
Tc = 25°C, VDD = 3.0 V if nothing else is stated. All measurement results obtained using the CC1101EM reference designs ([5]
and [6]).
Parameter Min Typ Max Unit Condition/Note
Calibrated frequency 34.7 34.7 36 kHz Calibrated RC Oscillator frequency is XTAL
frequency divided by 750
Frequency accuracy after
calibration
±1 %
Temperature coefficient +0.5
% / °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 is stated. All measurement results are obtained using the CC1101EM reference
designs ([5] and [6]). Min figures are given using a 27 MHz crystal. Typ and max are given using a 26 MHz crystal.
Parameter Min Typ Max Unit Condition/Note
Programmed frequency
resolution
397 F
XOSC
/
2
16
412 Hz 26-27 MHz crystal.
The resolution (in Hz) is equal for all frequency
bands.
Synthesizer frequency
tolerance
±40 ppm Given by crystal used. Required accuracy
(including temperature and aging) depends on
frequency band and channel bandwidth /
spacing.
RF carrier phase noise –92 dBc/Hz @ 50 kHz offset from carrier
RF carrier phase noise –92 dBc/Hz @ 100 kHz offset from carrier
RF carrier phase noise –92 dBc/Hz @ 200 kHz offset from carrier
RF carrier phase noise –98 dBc/Hz @ 500 kHz offset from carrier
RF carrier phase noise –107 dBc/Hz @ 1 MHz offset from carrier
RF carrier phase noise –113 dBc/Hz @ 2 MHz offset from carrier
RF carrier phase noise –119 dBc/Hz @ 5 MHz offset from carrier
RF carrier phase noise –129 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 RX, FSTXON or TX state, when not
performing calibration.
Crystal oscillator running.
PLL RX/TX settling time 9.3 9.6 9.6
µs
Settling time for the 1·IF frequency step from RX
to TX
PLL TX/RX settling time 20.7 21.5 21.5
µs
Settling time for the 1·IF frequency step from TX
to RX
PLL calibration time 694 721 721
µs
Calibration can be initiated manually or
automatically before entering or after leaving
RX/TX.
Table 9: Frequency Synthesizer Parameters