SM1211E915 Semtech, SM1211E915 Datasheet - Page 74

• Manufacturer Part Number: SM1211E915
• Description: Dev Kit Accessory
• Manufacturer: Semtech

Specifications of SM1211E915

• Modulation Type: FSK, OOK
• Data Rate Max: 200Kbps
• Frequency Range: 902MHz To 928MHz
• Supply Voltage Range: 2.1V To 3.6V
• Module Interface: SPI
• Supply Current: 25mA
• Accessory Type: RF Module
• Sensitivity: -105dBm
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Package Type: TQFN EP
• Operating Supply Voltage (min): 2.1V
• Operating Supply Voltage (typ): 2.5/3.3V
• Operating Supply Voltage (max): 3.6V
• Sensitivity (dbm): -105dBm
• Rohs Compliant: NA
• Lead Free Status / RoHS Status: na
• Lead Free Status / RoHS Status: na

The layers description is illustrated in Figure 57:
The layout itself is illustrated in Figure 58. Please contact Semtech for gerber files.
Table 35: Reference Design BOM
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 7 – Sept 2
ADVANCED COMMUNICATIONS & SENSING
*Not part of the ref. design (not required for direct antenna connection).
C10, C11
L1, L2
C12*
Ref
Q1
U1
U2
R1
R2
C1
C2
C3
C4
C5
C6
C7
C8
C9
L3
L4
7.5.3. Bill Of Material
nd
, 2008
869 MHz
868MHz
8.2 nH
12.8 MHz
9mm
SX1211
220 nF
100 nF
680 pF
100 nH
6.8 k
8.2 nH
1.8 pF
Value
47 nF
10 nF
22 pF
47pF
1uF
1uF
NC
1
915 MHz
915MHz
6.8 nH
Figure 58: Reference Design Layout (top view)
Tol (+/-)
-
-
15 ppm at 25° C
20 ppm over -40/+85° C
2ppm/year max
1%
1%
15%
15%
10%
10%
10%
10%
5%
0.25 pF
5%
0.2 nH
5%
5%
-
5%
Figure 57: Reference Design‘s Stackup
Page 74 of 92
Isolation (FR4, 1.6mm)
Signal (35um)
Ground plane
19mm
Techno
Transceiver IC
SAW Filter
AT-cut
-
-
X5R
X5R
X7R
X7R
X7R
X7R
NPO
NPO
NPO
Wire wound
Wire wound
Multilayer
-
NPO
Size
3.8*3.8 mm
5.0*3.2 mm
TQFN-32
0402
0402
0402
0402
0402
0402
0402
0402
0402
0402
0402
0402
0402
0402
0402
0402
Comment
-
Plotted in section 7.5.4
Fundamental, Cload=15 pF
PA regulator
Loop filter
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
-
DC block
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SX1211