Datasheet > B39871B3744H110

B39871B3744H110

更新时间： 2024-02-23 16:07:18

品牌	Logo	应用领域
爱普科斯 - EPCOS		/
页数	文件大小	规格书
10页	88K
描述
SAW filter Short range devices

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B39871B3744H110 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Contact Manufacturer	Reach Compliance Code：	compliant
Factory Lead Time：	9 weeks	风险等级：	3.7
其他特性：	INSERTION LOSS INCLUDING MATCHING ELEMENTS	中心频率或截止频率 (fo/fc)：	868.3 MHz
滤波器类型：	SAW FILTER	高度：	1 mm
输入阻抗：	290 OHM//1.3 pF	最大插入损耗：	3.7 dB
JESD-609代码：	e4	长度：	3 mm
安装类型：	SURFACE MOUNT	功能数量：	1
最高工作温度：	105 °C	最低工作温度：	-45 °C
输出阻抗：	290 OHM//1.3 pF Ω	物理尺寸：	L3.0XB3.0XH1.0 (mm)/L0.118XB0.118XH0.039 (inch)
端子面层：	Nickel/Gold (Ni/Au)	宽度：	3 mm
Base Number Matches：	1

SAW Components

SAW filter

B3744

868.30 MHz

Data sheet

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

C_p1= 2.7 pF

L_s2= 18 nH

L_s3= 18 nH

C_p4= 2.7 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 2,4 (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.

June 11, 2010

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