CC2550-RTY1 datasheet(7/55 Pages) TI

7 / 55 page

CC2550

PRELIMINARY Data Sheet (Rev.1.2)

SWRS039A

Page 7 of 54

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

397

FXOSC/

427

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

–117

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

FSTXON or TX state, when not performing calibration.

Crystal oscillator running.

PLL calibration time

0.69

18739

0.72

XOSC

cycles

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 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

0.660

Output voltage at 0

°C

0.755

Output voltage at +40

°C

0.859

Output voltage at +80

°C

0.958

Temperature coefficient

2.54

mV/

°C

Fitted from –20

°C to +80°C

Error in calculated

temperature, calibrated

-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

Current consumption

increase when enabled

0.3

Table 8: Analog temperature sensor parameters

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