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SX1240
Integrated Transmitter IC
ADVANCED COMMUNICATIONS & SENSING
5. Application Information
5.1. Crystal Specification
The SX1240 is designed to operate with a low-cost 26 MHz crystal.
DATASHEET
Table 9
SX1240 Quartz Crystal Reference Oscillator Specification
Symbol
FXOSC
LM
CM
RS
C0
CL
Description
Crystal Frequency
Crystal Motional Inductance
Crystal Motional Capacitance
Crystal Serial Resistance
Crystal Shunt Capacitance
Load Capacitance
Conditions
Min
26
-
-
-
-
-
Typ
26
12.655
2.962
20
1.0
15
Max
26
-
-
100
7.0
-
Unit
MHz
mH
fF
Ohms
pF
pF
5.2. Reference Design Schematics
V C C
R1
C6
GND
C5
GND
L1
C1
C2
Antenna1
P1
GND
1
U1
GND
SX1240
RFOUT
8
L2
C3
L3
RFIO1
LM
10
9
8
7
6
5
4
3
2
1
Data
R6
R_VBAT
Ctrl
VBAT
GND
1
XTAL
GND
Q1
2
3
4
2
DATA
GND
XTAL
GND
SCK
VBAT
7
6
5
GND
VCC
C7
GND
C8
GND
C4
GND
GND
C11
GND
MHDR1X10
GND
26 MHz
Q2
GND
R2
NC
R3
NC
VCC
GND
xtal
1
3
R4
0R0
26 MHz
2
4
GND
Figure 9. Application Module Schematics (See BoM for Optional Components)
SX1240, Rev 1, Oct 2010
?2010 Semtech Corp.
Page 14
www.semtech.com
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