SX1212IWLTRT Semtech, SX1212IWLTRT Datasheet - Page 74

• Manufacturer Part Number: SX1212IWLTRT
• Description: IC TXRX 300MHZ-510MHZ 32-TQFN
• Manufacturer: Semtech

Specifications of SX1212IWLTRT

• Frequency: 300MHz ~ 510MHz
• Data Rate - Maximum: 150kbps
• Modulation Or Protocol: FSK, OOK
• Applications: AMR, ISM, Home Automation, Process Control
• Power - Output: 12.5dBm
• Sensitivity: -110dBm
• Voltage - Supply: 2.1 V ~ 3.6 V
• Current - Receiving: 3mA
• Current - Transmitting: 25mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-TQFN
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Modulation Type: FSK/OOK
• Package Type: TQFN EP
• Operating Supply Voltage (min): 2.1V
• Operating Supply Voltage (typ): 2.5/3.3V
• Operating Supply Voltage (max): 3.6V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / Rohs Status: Supplier Unconfirmed
• Other names: SX1212IWLTR

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 2 – June 18th, 2009
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
330 MHz
330MHz
12.8 MHz
9mm
SX1212
Value
434 MHz
434MHz
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
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Isolation (FR4, 1.6mm)
Signal (35um)
Ground plane
19mm
Techno
SAW Filter
AT-cut
-
-
NPO
NPO
NPO
Wire wound
Wire wound
Multilayer
-
NPO
Transceiver IC
X5R
X5R
X7R
X7R
X7R
X7R
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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SX1212