CC2520_11 Datasheet, PDF (22/133 Pages) Texas Instruments – 2.4 GHZ IEEE 802.15.4/ZIGBEE RF TRANSCEIVER

CC2520 DATASHEET
2.4 GHZ IEEE 802.15.4/ZIGBEE® RF TRANSCEIVER
SWRS068 – DECEMBER 2007
6 Crystal Specific Parameters
6.1 Crystal Requirements
PARAMETER
Crystal frequency
Crystal frequency accuracy
requirement
ESR
C₀
C_L
CONDITIONS
MIN
Including initial tolerance, aging and
- 40
temperature dependency, as specified by [2].
Can be relaxed using on-chip crystal tuning
(see below).
TYP
MAX
UNIT
32
MHz
40
ppm
60
Ohm
7
pF
16
pF
6.2 On-chip Crystal Frequency Tuning
PARAMETER
CONDITIONS
MIN
TYP
Crystal tuning range (C_tune)
Only adding capacitance is possible
7
Crystal tuning step size
0.4
Crystal tuning drift
In % of applied tuning
+/-10
Start-up time
CRYSTAL TUNING USING CC2520 EM 2.1 REFERENCE DESIGN (NX3225DA, C_L = 16 pF) :
0.2
Crystal tuning step size
NDK crystal NX3225DA, C_L=16 pF
3
Crystal tuning range
-45
CRYSTAL TUNING USING OTHER CRYSTALS, ALL NUMBERS ARE ESTIMATES :
Start-up time
0.2
NDK crystal NX4025DA, C_L=13 pF
Crystal tuning step size
8
Crystal tuning range
-120
Start-up time
0.1
NDK crystal NX5032SA, C_L=10 pF
Crystal tuning step size
10
Crystal tuning range
-160
MAX
UNIT
pF
pF
%
ms
ppm
ppm
ms
ppm
ppm
ms
ppm
ppm
See section 22 for further details on using the crystal oscillator.
22
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