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SX1210
ADVANCED COMM UNICATIONS & SENSING
Signal (35um)
Isolation (FR4, 1.6mm)
Ground plane
Figure 45: Reference Design‘s Stackup
The layout itself is illustrated in Figure 46. Please contact Semtech for gerber files.
19mm
9mm
Figure 46: Reference Design Layout (top view)
7.5.3. Bill Of Material
Table 29: Reference Design BOM
Ref
Value
Tol (+/-)
Techno
Size
Comment
868MHz
915MHz
U1
Q1
SX1210
12.8 MHz
-
15 ppm at 25°C
Transceiver IC
AT-cut
TQFN-32
5.0*3.2 mm
-
Fundamental, Cload=15 pF
20 ppm over -40/+85°C
2ppm/year max
R2
C1
C2
C3
C5
C6
C7
C9
C10
L1, L2
6.8 k ?
1uF
1uF
220 nF
100 nF
10 nF
680 pF
22 pF
5.4nH
8.2 nH 6.8 nH
1%
15%
15%
10%
10%
10%
5%
5%
5%
0.2 nH
-
X5R
X5R
X7R
X7R
X7R
NPO
NPO
Multilayer
Wire wound
0402
0402
0402
0402
0402
0402
0402
0402
0402
0402
Loop filter
VDD decoupling
Top regulator decoupling
Digital regulator decoupling
VCO regulator decoupling
Loop Filter
Loop Filter
DC block and L4 adjust
Matching
VCO tank inductors
U2
869 MHz
915 MHz
-
SAW Filter
3.8*3.8 mm
Optional
L4
R1
C4
C8
L3
C11
C12*
0R
NC
NC
NC
NC
NC
47pF
-
-
-
-
-
-
5%
-
-
-
-
-
-
NPO
0402
0402
0402
0402
0402
0402
0402
-
-
-
-
-
-
DC block
Note: for battery powered applications, a high value capacitance should be implemented in parallel with C1
(typically 10 μF) to offer a low impedance voltage source during startup sequences.
Rev 2– Sept 8 , 2008
th
Page 62 of 73
www.semtech.com
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