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SX1211
WIRELESS & SENSING
The layers description is illustrated in Figure 57:
Signal (35um)
Isolation (FR4, 1.6mm)
Ground plane
Figure 57: Reference Design‘s Stackup
The layout itself is illustrated in Figure 58. Please contact Semtech for gerber files.
19mm
9mm
Figure 58: Reference Design Layout (top view)
7.5.3. Bill Of Material
Table 35: Reference Design BOM
Ref
Value
Tol (+/-)
Techno
Size
Comment
868MHz
915MHz
U1
U2
SX1211
869 MHz 915 MHz
- Transceiver IC
- SAW Filter
TQFN-32
3.8*3.8 mm
-
Plotted in section 7.5.4
Q1
12.8 MHz
15 ppm at 25°C
AT-cut
5.0*3.2 mm
Fundamental, Cload=15 pF
20 ppm over -40/+85°C
2ppm/year max
R1 1 ?
R2 6.8 k ?
1% -
1% -
0402
0402
PA regulator
Loop filter
C1 1uF 15% X5R
C2 1uF 15% X5R
C3 220 nF 10% X7R
C4 47 nF 10% X7R
C5 100 nF 10% X7R
C6 10 nF 10% X7R
C7 680 pF 5% NPO
C8 1.8 pF 0.25 pF NPO
C9 22 pF 5% NPO
L1, L2 8.2 nH 6.8 nH 0.2 nH Wire wound
L3 100 nH 5% Wire wound
L4 8.2 nH 5% Multilayer
0402
0402
0402
0402
0402
0402
0402
0402
0402
0402
0402
0402
VDD decoupling
Top regulator decoupling
Digital regulator decoupling
PA regulator decoupling
VCO regulator decoupling
Loop Filter
Loop Filter
Matching
DC block and L4 adjust
VCO tank inductors
PA Choke
Matching
C10, C11
C12*
NC
47pF
-
5%
-
NPO
0402
0402
-
DC block
*Not part of the ref. design (not required for direct antenna connection).
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 8 – February 2013
Page 74 of 92
www.semtech.com
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