xe1205 Semtech Corporation, xe1205 Datasheet - Page 41

• Manufacturer Part Number: xe1205
• Description: Low-power, High Link Budget Integrated Uhf Transceiver
• Manufacturer: Semtech Corporation

8
This section provides details of the recommended component values for the frequency dependant blocks of the XE1205.
Note that these values are dependent upon circuit layout and PCB structure, and that decoupling components have been
omitted for clarity.
The schematic of the matching network at the input of the receiver is given below (for a source impedance of 50W).
The typical component values of the matching circuit are shown in Table 29 below.
The optimum load impedances for 15 dBm output power at the three main frequencies are given in Table 30.
© Semtech 2007
8.1
8.2
Name
CR1
CR2
LR1
APPLICATION INFORMATION
MATCHING NETWORK OF THE RECEIVER
MATCHING NETWORK OF THE TRANSMITTER
PA optimum load
0 dBm
5 dBm
10 dBm
15 dBm
SOURCE
Typical Value for
434 MHz
100nH
1.5pF
1.5pF
Table 30: Optimum load impedances for 15dBm output power
Figure 25 Matching network at the input of the receiver.
VSS
174 + j17
117 + j22
111 + j17
434 MHz
Table 29: Matching network values
89 - j19
Typical Value for
CR1
CR2
869 MHz
1.2pF
1.5pF
27nH
LR1
41
120 + j80
115 + j79
869 MHz
95 + j49
80 + j17
Typical Value for
RFA
RFB
915 MHz
XE1205
1.2pF
1.2pF
103 + j94
101 + j77
27nH
915 MHz
95 + j49
84 + j11
XE1205
Tolerance
± 5 %
± 5%
± 5%
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