CC2500-RTY1 datasheet(12/96 Pages) TI

12 / 96 page

CC2500

SWRS040C

Page 12 of 89

4.4

Crystal Oscillator

Tc = 25

C, VDD = 3.0 V if nothing else stated.

Parameter

Min

Typ

Max

Unit

Condition/Note

Crystal frequency

MHz

Tolerance

±40

ppm

This is the total tolerance including a) initial tolerance, b) crystal

loading, c) aging, and d) temperature dependence.

The acceptable crystal tolerance depends on RF frequency and

channel spacing / bandwidth.

ESR

100



Start-up time

150

µs

Measured on CC2500EM reference design ([4]) using crystal

AT-41CD2 from NDK.

This parameter is to a large degree crystal dependent.

Table 7: Crystal Oscillator Parameters

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

([4]).

Parameter

Min

Typ

Max

Unit

Condition/Note

Calibrated frequency

34.7

kHz

Calibrated RC oscillator frequency is XTAL

frequency divided by 750

Frequency accuracy after

calibration

-1 /

+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 Notes.

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

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