CC2480_11 Datasheet, PDF (11/48 Pages) Texas Instruments – Z-Accel 2.4 GHz ZigBee Processor

CC2480
Parameter
Crystal frequency
Crystal frequency
accuracy
requirement
ESR
C₀
C_L
Start-up time
Table 8: 32.768 kHz Crystal Oscillator Parameters
Min Typ Max Unit Condition/Note
32.768
kHz
–40
40 ppm Including aging and temperature dependency, as specified by [1]
40
130 kΩ Simulated over operating conditions
0.9
2.0 pF Simulated over operating conditions
12
16 pF Simulated over operating conditions
400
ms Value is simulated.
5.6 32 kHz RC Oscillator
Measured on Texas Instruments CC2480 EM reference design with T_A=25°C and VDD=3.0V
unless stated otherwise.
Table 9: 32 kHz RC Oscillator parameters
Parameter
Calibrated frequency
Frequency accuracy after
calibration
Temperature coefficient
Supply voltage coefficient
Initial calibration time
Min
Typ
Max Unit
32.753
kHz
±0.2
%
Condition/Note
The calibrated 32 kHz RC Oscillator frequency
is the 32 MHz XTAL frequency divided by 977
Value is estimated.
+0.4
% / °C Frequency drift when temperature changes
after calibration. Value is estimated.
+3
%/V
Frequency drift when supply voltage changes
after calibration. Value is estimated.
1.7
ms
When the 32 kHz RC Oscillator is enabled,
calibration is continuously done in the
background as long as the 32 MHz crystal
oscillator is running.
5.7 16 MHz RC Oscillator
Measured on Texas Instruments CC2480 EM reference design with T_A=25°C and VDD=3.0V
unless stated otherwise.
Table 10: 16 MHz RC Oscillator parameters
Parameter
Frequency
Uncalibrated frequency
accuracy
Calibrated frequency
accuracy
Start-up time
Temperature coefficient
Supply voltage coefficient
Initial calibration time
Min
Typ
Max Unit
16
MHz
±18
%
Condition/Note
The calibrated 16 MHz RC Oscillator
frequency is the 32 MHz XTAL frequency
divided by 2
±0.6
±1 %
10 µs
-325 ppm / °C Frequency drift when temperature changes
after calibration
28 ppm / mV Frequency drift when supply voltage changes
after calibration
50
µs
When the 16 MHz RC Oscillator is enabled it
will be calibrated continuously when the
32MHz crystal oscillator is running.
CC2480 Data Sheet SWRS074A
Page 11 of 43