CC2500-RTY1 datasheet(11/84 Pages) TI

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

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

% / V

Frequency drift when supply voltage changes

after calibration

Initial calibration time

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/

412

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

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 9: Frequency synthesizer parameters

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