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| 型号： | SX1223SK915 |
| 厂商： | Semtech |
| 文件页数： | 21/25页 |
| 文件大小： | 0K |
| 描述： | KIT STARTER FOR XE1223 915MHZ |
| 产品培训模块： | SX1223 ISM Transmitter |
| 标准包装： | 1 |
| 类型： | 发射器，UHF |
| 频率： | 915MHz |
| 适用于相关产品： | XE1223（915MHz） |
| 已供物品： | 2 个板，2 个模块，2 根天线，线缆，文档 |
| 产品目录页面： | 584 (CN2011-ZH PDF) |
SX1223
6
APPLICATION INFORMATION
This section provides details of the recommended components values for the frequency dependant blocks of the
SX1223. Note that these values are dependent upon circuit layout and PCB structure.
6.1 MATCHING NETWORK OF THE TRANSMITTER
The optimum load impedances for 10 dBm output power at the three main frequencies are given in the following
table.
434 MHz
869 MHz
915 MHz
PA optimum load
19.4-j2.6
23.5-j1
23.5+j8
Table 32: Optimum load impedances for 10 dBm output power
The schematic of the recommended matching network at the output of the transmitter is given in Figure 9 on the
next page.
CT2
SX1223
CT3
LT1
Figure 9: Transmitter output network
The Π -section is used to provide harmonic filtering in order to satisfy FCC and ETSI regulations.
The typical component values of this matching circuit are given below.
Name
CT1
CT2
CT3
CT4
LT1
Typical Value
for 434 MHz
6.8pF
1pF
10pF
10pF
22nH
Typical Value
for 869 MHz
6.8 pF
NC
15 pF
6.8 pF
4.7 nH
Typical Value
for 915 MHz
6.8 pF
NC
33 pF
4.7 pF
4.7 nH
Tolerance
± 5%
± 5%
± 5%
± 5%
± 5%
Table 33: Typical component values for the recommended matching network at the output of the transmitter
? Semtech 2007
21
www.semtech.com
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