CC2550_06 Datasheet, PDF (7/55 Pages) Texas Instruments – Single Chip Low Cost Low Power RF Transmitter

CC2550
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.
Parameter
Min Typ
Max Unit
Condition/Note
Programmed
frequency resolution
Synthesizer frequency
tolerance
397
F_XOSC/
2¹⁶
±40
RF carrier phase noise
PLL turn-on / hop time
–74
–74
–77
–97
–106
–114
–117
88.4
PLL calibration time
18739
0.69 0.72
427 Hz
26-27 MHz crystal.
ppm
Given by crystal used. Required accuracy (including
temperature and aging) depends on frequency band and
channel bandwidth / spacing.
dBc/Hz @ 50 kHz offset from carrier
dBc/Hz @ 100 kHz offset from carrier
dBc/Hz @ 200 kHz offset from carrier
dBc/Hz @ 1 MHz offset from carrier
dBc/Hz @ 2 MHz offset from carrier
dBc/Hz @ 5 MHz offset from carrier
dBc/Hz @ 10 MHz offset from carrier
µs
Time from leaving the IDLE state until arriving in the
FSTXON or TX state, when not performing calibration.
Crystal oscillator running.
XOSC Calibration can be initiated manually or automatically
cycles before entering or after leaving RX/TX.
0.72 ms
Min/typ/max time is for 27/26/26 MHz crystal frequency.
Table 7: Frequency synthesizer parameters
4.5 Analog Temperature Sensor
The characteristics of the analog temperature sensor are listed in Table 8 below. Note that it is
necessary to write 0xBF to the PTEST register to use the analog temperature sensor in the IDLE
state.
Parameter
Min Typ Max Unit Condition/Note
Output voltage at –40°C
Output voltage at 0°C
Output voltage at +40°C
Output voltage at +80°C
Temperature coefficient
Error in calculated
temperature, calibrated
Current consumption
increase when enabled
0.660
V
0.755
V
0.859
V
0.958
V
2.54
mV/°C Fitted from –20°C to +80°C
-2 ^*
0
2^*
°C
From –20°C to +80°C when using 2.54 mV / °C,
after 1-point calibration at room temperature
* _{The indicated minimum and maximum error with 1-}
point calibration is based on simulated values for
typical process parameters
0.3
mA
Table 8: Analog temperature sensor parameters
PRELIMINARY Data Sheet (Rev.1.2) SWRS039A
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