CC1110FX_16 Datasheet, PDF (19/249 Pages) Texas Instruments – Low-Power SoC (System-on-Chip)

CC1110Fx / CC1111Fx
6.4 Crystal Oscillators
6.4.1 CC1110Fx Crystal Oscillator
T_A = 25 C, VDD = 3.0 V if nothing else is stated.
Parameter
Crystal frequency
Crystal frequency
accuracy
requirement
C0
Load capacitance
ESR
Start-up time
Power Down
Guard Time
Min Typ Max Unit Condition/Note
26 26 27 MHz Referred to as fXOSC.
±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.
1
5
7
pF Simulated over operating conditions
10 13 20 pF Simulated over operating conditions
100
Simulated over operating conditions
250
μs fXOSC = 26 MHz
Note: A Ripple counter of 12 bit is included to ensure duty-cycle
requirements. Start-up time includes ripple counter delay until
SLEEP.XOSC_STB is asserted
3
ms The crystal oscillator must be in power down for a guard time before it
is used again. This requirement is valid for all modes of operation. The
need for power down guard time can vary with crystal type and load.
Minimum figure is valid for reference crystal NDK, AT-41CD2 and load
capacitance according to Table 29.
If power down guard time is violated, one of the consequences can be
increased PER when using the radio immediately after the crystal
oscillator has been reported stable.
Table 11: CC1110Fx Crystal Oscillator Parameters
6.4.2 CC1111Fx Crystal Oscillator
T_A = 25 C, VDD = 3.0 V if nothing else is stated.
Parameter
Min Typ Max Unit Condition/Note
Crystal frequency
48
MHz Referred to as fXOSC.
48 MHz crystal gives a system clock of 24 MHz.
Please note that there is restricted usage in the frequency bands 863 -
870 MHz (due to spurious emission). See DN016 Compact Antenna
Solutions for 868/915 MHz [14]
Crystal frequency
accuracy
requirement
±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.
C0
Fundamental
0.85 1 1.15 pF Simulated over operating conditions. Variation given by reference
crystal NX2520SA from NDK (fundamental).
Load capacitance 15 16 17 pF Simulated over operating conditions
ESR
60
Simulated over operating conditions
Start-up time
Note: A Ripple counter of 14 bit is included to ensure duty-cycle
requirements. Start-up time includes ripple counter delay until
SLEEP.XOSC_STB is asserted
Fundamental
650
μs
Table 12: CC1111Fx Crystal Oscillator Parameters
SWRS033H
Page 19 of 246