xe1205 Semtech Corporation, xe1205 Datasheet - Page 44

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

The schematic of the recommended matching network at the output of the transmitter is given in Figure 28 below. The
two P-sections are used to provide harmonic filtering to satisfy FCC and ETSI regulations.
The typical component values of the matching circuit are shown in Table 31 below.
The VCO tank circuit should implemented with an inductor and capacitor in parallel. Typical component values are
shown in Table 32.
© Semtech 2007
8.3
VCO TANK
Name
CT1
CT2
CT3
CT4
CT5
LT1
LT2
LT3
Name
CV1
LV1
OUTPUT
Typical Value
Figure 28 Matching network at the output of the transmitter.
for 434 MHz
434 MHz
1.0 pF
6.8 pF
1.0 pF
6.8 pF
4.7 pF
Table 31: Matching circuit component values
33 nH
33 nH
22 nH
22 nH
22 pF
Table 32: VCO tank component values
LT3
Typical Value
for 869 MHz
869 MHz
6.8 nH
0.56 pF
8.2 nH
1.5 pF
3.3 pF
2.2 pF
39 nH
10 nH
NC
15 pF
CT3
44
LT2
Typical Value
CT2
for 915 MHz
915 MHz
5.6 nH
NC
8.2 nH
1.8 pF
3.3 pF
2.2 pF
47 nH
10 nH
33 pF
NC
VDD
Tolerance
Tolerance
± 5 %
± 2 %
± 5%
± 5%
± 5%
± 5%
± 5%
± 5%
± 5%
± 5%
RFOUT
XE1205
XE1205
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