CC2510F16 Datasheet, PDF (16/244 Pages) Texas Instruments – Low-Power SoC (System-on-Chip) with MCU, Memory, 2.4 GHz RF Transceiver, and USB Controller

CC2510Fx / CC2511Fx
6.4 Crystal Oscillators
6.4.1 CC2510Fx 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
24 26 27 MHz Referred to as f_XOSC. For operation below 26 MHz, please refer to Table
4 for Operating Conditions.
±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 Ω Simulated over operating conditions
250
µs f_XOSC = 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: CC2510Fx Crystal Oscillator Parameters
6.4.2 CC2511Fx Crystal Oscillator
T_A = 25°C, VDD = 3.0 V if nothing else is stated.
Parameter
Crystal frequency
Crystal frequency
accuracy
requirement
C₀
Fundamental
3^rd overtone
Load capacitance
ESR
Start-up time
Fundamental
3^rd overtone
Min Typ Max Unit Condition/Note
48
MHz Referred to as f_XOSC
±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.
0.85 1 1.15 pF Simulated over operating conditions. Variation given by reference
crystal NX2520SA from NDK
2
3
7
pF
15 16 17
pF Simulated over operating conditions
60
Ω Simulated over operating conditions
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
650
µs
3
ms Simulated value
Table 12: CC2511Fx Crystal Oscillator Parameters
SWRS055F
Page 16 of 241