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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
26
26
27
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
34.7
36
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
+3
% / V
Frequency drift when supply voltage changes
after calibration
Initial calibration time
2
ms
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
Summary of Contents for CC2500
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