CC2510Fx / CC2511Fx
6.4 Crystal Oscillators
6.4.1
CC2510Fx Crystal Oscillator
TA = 25°C, VDD = 3.0 V if nothing else is stated.
Parameter
Min
Typ
Max
Unit
Condition/Note
Crystal frequency
24
26
27
MHz
Referred to as fXOSC. For operation below 26 MHz, please refer to Table
4 for Operating Conditions.
Crystal frequency
accuracy
±40
ppm
This is the total tolerance including a) initial tolerance, b) crystal
loading, c) aging, and d) temperature dependence.
requirement
The acceptable crystal tolerance depends on RF frequency and
channel spacing / bandwidth.
C0
1
5
7
pF
pF
Ω
Simulated over operating conditions
Simulated over operating conditions
Simulated over operating conditions
fXOSC = 26 MHz
Load capacitance
ESR
10
13
20
100
Start-up time
250
µs
Note: A Ripple counter of 12 bit is included to ensure duty-cycle
requirements. Start-up time includes ripple counter delay until
SLEEP.XOSC_STBis asserted
Power Down
Guard Time
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
CC2511Fx Crystal Oscillator
TA = 25°C, VDD = 3.0 V if nothing else is stated.
6.4.2
Parameter
Min
Typ
48
Max
Unit
MHz
ppm
Condition/Note
Crystal frequency
Referred to as fXOSC
Crystal frequency
accuracy
±40
This is the total tolerance including a) initial tolerance, b) crystal
loading, c) aging, and d) temperature dependence.
requirement
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
3rd overtone
Load capacitance
ESR
2
3
7
pF
pF
Ω
15
16
17
60
Simulated over operating conditions
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_STBis asserted
Fundamental
3rd overtone
650
3
µs
ms
Simulated value
Table 12: CC2511Fx Crystal Oscillator Parameters
SWRS055F
Page 16 of 241
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