TFS1220 Datasheet PDF - Vectron International


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TFS1220
Vectron International

Part Number TFS1220
Description VI TELEFILTER
Page 2 Pages

TFS1220 datasheet pdf
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Ltp: tft038
version 1.0
04.11.2003
______________________________________________________________________________________________________
___
VI TELEFILTER
Application Note
TFS 1220 - 1/2
______________________________________________________________________________________________________
___
1. General
The filter is single ended driven. It is matched to 50 Ω
The matching element values given below are valid on our test PCB. If the parasitic’s on the
customer PCB and on this PCB are different, the matching elements have to be optimised
regarding the circuit and PCB design.
The matching elements have been chosen from the E12- series (European standard series
with fixed tolerances).
2. Theoretical matching
The termination impedances of the filter are:
Input impedance:
95 Ω || - 0,3 pF
Output impedance:
95 Ω || - 0,3 pF
The values of the matching elements which are given below are calculated from the input
and output terminating impedance.
L1 2
6 L2
C1 SAW C2
L1 = 6.8 nH
C1 = 0.3 pF
1,3,4,5,7,8
L2 = 5.8 nH
C2 = 0.27 pF
TELEFILTER GmbH
Potsdamer Straße 18
D 14 513 TELTOW / Germany
Tel: (+49) 3328 4784-0/ Fax: (+49) 3328 4784-30
E-Mail: tft@telefilter.com
VI TELEFILTER reserves the right to make changes to the product(s) and/or information contained herein without notice. No liability is
www.DataSheet4Uas.nsuemt ed as a result of their use or application. No rights under any patent accompany the sale of any such product(s) or information.



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Ltp: tft038
version 1.0
04.11.2003
______________________________________________________________________________________________________
___
VI TELEFILTER
Application Note
TFS 1220 - 2/2
______________________________________________________________________________________________________
___
3. Matching on PCB ( tft038 )
26
L1 SAW L2
1,3,4,5,7,8
L1 = L2 = 6,8 nH
All other components are 0 Ω jumpers.
The matching on the PCB does slightly differ from the theoretical matching. The reason for
that are parasitic’s on the PCB.
If the parasitic’s on the customer board (mentioned parasitics, additional parasitics of active
parts) are different to this PCB the matching elements have to be slightly adjusted.
In case of questions please contact us to
TELEFILTER GmbH
Potsdamer Straße 18
D 14 513 TELTOW / Germany
Tel: (+49) 3328 4784-0/ Fax: (+49) 3328 4784-30
E-Mail: tft@telefilter.com
VI TELEFILTER reserves the right to make changes to the product(s) and/or information contained herein without notice. No liability is
assumed as a result of their use or application. No rights under any patent accompany the sale of any such product(s) or information.




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