Texas Instruments CC2500 User Manual

CC2500
S
WRS040
C
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 depend
s 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
O
scillator
P
arameters
4.5
Low Power RC Oscillator
Tc = 25

C,
VDD = 3.0 V if nothing else stated.
All measurement results obtained usin
g the CC2500EM reference design
(
[4]
).
Parameter
Min
Typ
Max
Unit
Condition/Note
Calibrated frequency
34.
7
34.7
36
kHz
Calibrated RC o
scillator frequency is XTAL
frequency divided by 750
Frequency accuracy after
calibration
-
1 /
+
10
%
The RC oscillator contains an error in the
c
alibration routine that statistically occurs in
17.3% of all calibrations performed. The given
max
imum
accuracy figures account for the
calibration error.
Refer also to the
CC2500
Errata Note
s
.
Temperature coefficient
+0.4
% /

C
Frequency drift when te
mperature changes
after calibration
Supply voltage coefficient
+3
% / V
Frequency drift when supply voltage changes
after calibration
Initial calibration time
2
ms
When the RC o
scillator is enabled, calibration
is continuously done in the background
as long
as the crystal oscillator is running.
Table
8
: RC
O
scillator
P
arameters

Texas Instruments CC2500 Specifications

General

Brand	Texas Instruments
Model	CC2500
Category	Transceiver
Language	English