XE1202AI027TRLF Semtech, XE1202AI027TRLF Datasheet - Page 26

• Manufacturer Part Number: XE1202AI027TRLF
• Description: Narrow Band 433/868/915MHz RF Transceiver
• Manufacturer: Semtech

6 Application Information
This section provides details of the recommended component values for the frequency dependant blocks of the
XE1202A TrueRF™. Note that these values are dependent upon circuit layout and PCB structure, and that
decoupling components have been omitted for clarity.
6.1 Receiver matching network
The schematic of the matching network at the input of the receiver is given Figure 13 below (for a source
impedance of 50 Ω).
The typical recommended values for the external components are given in Table 25:
6.2 Transmitter matching network
The optimum load impedances for 15 dBm output power at the three main frequencies are given in Table 26:
© Semtech 2006
PA optimum load
Name
CR1
CR2
CR3
LR1
SOURCE
Table 26: Optimum load impedance versus frequency
VSS
CR3
Figure 13: Receiver matching network
100 nH ± 5 %
Table 25: External Matching Components
1.5 pF ± 5 %
1.5 pF ± 5 %
434 MHz
NC
434 MHz
66 – 5j
CR1
CR2
27
1.2 pF ± 5 %
1.5 pF ± 5 %
27 nH ± 5 %
868 MHz
NC
868 MHz
66 + 14j
LR1
XE1202A TrueRF™
RFA
RFB
XE1202A
TrueRF™
EAGLE ASIC
0.82 pF ± 5 %
0.82 pF ± 5 %
27 nH ± 5 %
915 MHz
915 MHz
64 + 13j
NC
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