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B3571 Datasheet(PDF) 4 Page - EPCOS

Part No. B3571
Description  SAW Components Low-loss Filter 868,60 MHz
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Manufacturer  EPCOS [EPCOS]
Direct Link  http://www.epcos.com

B3571 Datasheet(HTML) 4 Page - EPCOS

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May 09, 2001
SAW Components
868,60 MHz
Low-loss Filter
Data Sheet
Matching network to 50
Ω (element values depend on pcb layout and equivalent circuit)
Cp1 = 3,3 pF
Ls2 = 15 nH
Ls3 = 15 nH
Cp4 = 3,3 pF
Minimising the crosstalk
For a good ultimate rejection a low crosstalk is necessary. Low crosstalk can be realised with
a good RF layout.
Grounding pins for input transducer are pin 1,3 and for output transducer 5,7. Close to those
pins via holes (through holes) should be placed to achieve a low impedance path to system
ground. If a grounding plane at the top side of the PCB is present, the grounding plane can be
connected to pin 1,3,5,7 at the top side too.
The optimised PCB layout, including matching network for transformation to 50 Ohm, is shown
Optimised PCB layout for SAW filters in QCC8C package, pinning 2,6 (top side, scale 1:1)
The bottom side is a copper plane (system ground area).
For good contact of the upper grounding area with the lower side it is necessary to place
enough via holes.

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