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| 型号： | SM1230E868 |
| 厂商： | Semtech |
| 文件页数： | 34/46页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL XMITTER FOR SX1230 |
| 设计资源： | SM1230 BOM SX1230 Eval Board Schematic |
| 标准包装： | 1 |
| 类型： | 发射器 |
| 频率： | 868MHz |
| 适用于相关产品： | SX1230 |
| 已供物品： | 板 |
| 产品目录页面： | 584 (CN2011-ZH PDF) |
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SX1230
Integrated Transmitter IC
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
7.8. TCXO Connection
The frequency accuracy of the SX1230 is dependent upon the precision of the frequency reference from which the RF
output is derived. For applications where high frequency accuracy or stability is required, such as narrow band or licensed
band applications, the connection of a temperature compensated crystal oscillator (TCXO) is possible. The SX1230 allows
the direct connection of a 1.8 V, clipped sine type TCXO to the XTA input. The connection is shown in Figure 21, please
consult your TCXO supplier for an appropriate value of decoupling capacitor, C D .
SX1230
XTA
XTB
NC
TCXO
32 MHz
OP
Vcc
Vcc
GND
C D
Figure 21. Direct TCXO Connection
7.9. PCB Layout Considerations
Thanks to its fully integrated architecture PCB layout with the SX1230 can be straight forward. It is nonetheless a high
performance RFIC therefore, to attain the best RF performance, certain design rules should be adhered to:
When designing the a PCB layout for the SX1230 the use of at least two metallized layers is advised, one side forming
the populated (component) layer, the second forming a continuous ground plane. Ideally this ground plane should be
unbroken and be situated beneath the SX1230 circuit and RF signal path. Adopting this layout strategy minimizes the
potential for spurious emission from, and coupling to, the SX1230.
Decoupling components should be located as close as possible to the SX1230, ideally each with its own via connection
direct to the ground plane.
The crystal oscillator circuit is differential, so benefits from both symmetrical layout and proximity to the SX1230.
The RF signal path should be kept as straight as possible, ideally duplicating the SX1230 reference design (SM1230).
For a more detailed treatment of the PCB layout for semtech devices please see application note AN1200.04 “RF design
guidelines: PCB layout and circuit optimization”.
SX1230, Revision 2 May 2009
?2008 Semtech Corp.
Page 34
www.semtech.com
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| SM1231E433A | 制造商:Semtech Corporation 功能描述:SX1231 RF MODULE 433 MHZ |
| SM1231E868 | 制造商:Semtech Corporation 功能描述:Development module for SX1231 868MHz Low Power Integrated UHF Transceiver 制造商:SEMTECH 功能描述:Development module for SX1231 868MHz Low Power Integrated UHF Transceiver |
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