CC2430 Datasheet, PDF (17/234 Pages) Texas Instruments – A True System-on-Chip solution for 2.4 GHz IEEE 802.15.4 / ZigBee-TM

CC2430
7.7 High Speed RC Oscillator
T_A=25°C, VDD=3.0V if nothing else is stated.
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
%
±0.6
±1 %
Condition/Note
Calibrated High Speed RC Oscillator
frequency is XTAL frequency multiplied by 1/2
Measured on Chipcon’s CC2430 EM reference
design.
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 High Speed RC Oscillator is
enabled, calibration is continuously done in the
background as long as the crystal oscillator is
running.
Table 11: High Speed RC Oscillator parameters
7.8 Frequency Synthesizer Characteristics
T_A=25°C, VDD=3.0V if nothing else stated. Measured on Chipcon’s CC2430 EM reference design.
Parameter
Min
Typ
Max Unit
Condition/Note
Phase noise
−107
−113
−119
−121
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
Unmodulated carrier
At ±1 MHz offset from carrier
At ±2 MHz offset from carrier
At ±3 MHz offset from carrier
At ±5 MHz offset from carrier
PLL lock time
192 µs
The startup time when the crystal oscillator is running
and RX / TX turnaround time
Table 12: Frequency Synthesizer Parameters
CC2430 PRELIMINARY Data Sheet (rev. 1.03) SWRS036A
Page 17 of 232