CC2500 datasheet(11/76 Pages) TI

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CC2500

Preliminary Data Sheet (rev.1.1.)

SWRS040

Page 11 of 77

4.5

Low Power RC Oscillator

Typical performance is for Tc = 25

°C @ VDD = 3.0 V if nothing else is stated. The values in the table are simulated results

and will be updated in later versions of the data sheet.

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

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.

Wake-up period

58e-6

59650

Seconds

Programmable, dependent on XTAL frequency

Table 8: RC Oscillator Parameters

4.6

Frequency Synthesizer Characteristics

Tc = 25

°C, VDD = 3.0 V if nothing else stated. All measurements were performed 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.

RF carrier phase noise

–78

dBc/Hz

@ 50 kHz offset from carrier

RF carrier phase noise

–78

dBc/Hz

@ 100 kHz offset from carrier

RF carrier phase noise

–81

dBc/Hz

@ 200 kHz offset from carrier

RF carrier phase noise

–90

dBc/Hz

@ 500 kHz offset from carrier

RF carrier phase noise

–100

dBc/Hz

@ 1 MHz offset from carrier

RF carrier phase noise

–108

dBc/Hz

@ 2 MHz offset from carrier

RF carrier phase noise

–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

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 and

TX/RX settling time

µs

Settling time for the 1xIF frequency step from RX to TX,

and vice versa.

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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