B3942 Datasheet PDF - TDK
| Part Number | B3942 | |
| Description | SAW Components | |
| Manufacturers | TDK | |
| Logo |  |
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There is a preview and B3942 download ( pdf file ) link at the bottom of this page. Total 10 Pages | ||
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SAW Components
SAW filter
Short range devices
Series/type:
Ordering code:
Date:
Version:
B3942
B39171B3942U310
April 24, 2013
2.2
EPCOS AG 2015. Reproduction, publication and dissemination of this publication, enclosures hereto and the information
contained therein without EPCOS' prior express consent is prohibited.
EPCOS AG is a TDK Group Company.
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SAW Components
B3942
SAW filter
169.5 MHz
Data sheet
Matching network to 50 Ω (element values depend on pcb layout and equivalent circuit)
Cp1 = 2.2 pF
Ls2 = 180 nH
Ls3 = 180 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 QCC8C package, pinning 1,5 (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.
Please read cautions and warnings and
important notes at the end of this document.
5 April 24, 2013
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for B3942 electronic component. |
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