Datasheet > 过滤器 > SAW 滤波器> B39321-B3781-Z810

B39321-B3781-Z810

更新时间： 2024-02-10 08:40:17

品牌	Logo	应用领域
爱普科斯 - EPCOS		SAW滤波器过滤器配套器件瞄准线 LTE PC
页数	文件大小	规格书
6页	82K
描述
SAW Components Low-loss Filter 315,00 MHz

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B39321-B3781-Z810 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	Reach Compliance Code：	compliant
风险等级：	5	Is Samacsys：	N
其他特性：	INSERTION LOSS INCLUDING MATCHING ELEMENTS	中心频率或截止频率 (fo/fc)：	315 MHz
滤波器类型：	SAW FILTER	高度：	1.5 mm
输入阻抗：	410 OHM//2.6 pF	最大插入损耗：	2.5 dB
JESD-609代码：	e4	长度：	3.8 mm
安装类型：	SURFACE MOUNT	功能数量：	1
最高工作温度：	85 °C	最低工作温度：	-40 °C
输出阻抗：	410 OHM//2.6 pF Ω	物理尺寸：	L3.8XB3.8XH1.5 (mm)/L0.15XB0.15XH0.059 (inch)
端子面层：	GOLD OVER NICKEL	宽度：	3.8 mm
Base Number Matches：	1

B39321-B3781-Z810 数据手册

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SAW Components

Low-loss Filter

Data Sheet

B3781

315,00 MHz

Matching network to 50 Ω (element values depend on pcb layout and equivalent circuit)

C_p1= 1,5 pF

L_s2= 68 nH

L_s3= 68 nH

C_p4= 1,5 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 QCC8B package, pinning 2,5 (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.

Feb 22, 2005

1 2 345 6

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