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B39871B3941H110 PDF预览

B39871B3941H110

更新时间: 2022-02-26 14:13:41
品牌 Logo 应用领域
东电化 - TDK /
页数 文件大小 规格书
10页 107K
描述
SAW filter

B39871B3941H110 数据手册

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SAW Components  
SAW filter  
B3941  
868.95 MHz  
Data sheet  
Matching network to 50 (element values depend on pcb layout and equivalent circuit)  
Cp1 = 2.2 pF  
Ls2 = 18 nH  
Ls3 = 18 nH  
Cp4 = 2.2 pF  
Minimising the crosstalk  
For a good ultimate rejection a low crosstalk is necessary. Low crosstalk can be realised with a good  
RF layout. The major crosstalk mechanism is caused by the “ground-loop” problem.  
Grounding loops are created if input-and output transducer GND are connected on the top-side of  
the PCB and fed to the system grounding plane by a common via hole. To avoid the common  
ground path, the ground pin of the input- and output transducer are fed to the system ground plane  
(bottom PCB plane) by their own via hole. The transducers’ grounding pins should be isolated from  
the upper grounding plane.  
A common GND inductivity of 0.5nH degrades the ultimate rejection (crosstalk) by 20dB.  
The optimised PCB layout, including matching network for transformation to 50 Ohm, is shown  
here. In this PCB layout the grounding loops are minimised to realise good ultimate rejection  
Optimised PCB layout for SAW filters in DCC6E package, pinning 1,4 (top side, scale 1:1)  
The bottom side is a copper plane (system ground area). The input and output grounding pins are  
isolated and connected to the common ground by separated via holes.  
For good contact of the upper grounding area with the lower side it is necessary to place enough  
via holes.  
Please read cautions and warnings and  
important notes at the end of this document.  
5
February 05, 2013  

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