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K6257K

S+M
Part Number K6257K
Manufacturer S+M
Description SAW filter
Published Sep 4, 2014
Detailed Description Switchable SAW Filter K6257K Application Notes Author: Updated: Department: Abstract: Fröhlich 26.08.98 OFW E UE K625...
Datasheet PDF File K6257K PDF File

K6257K
K6257K

Overview
Switchable SAW Filter K6257K Application Notes Author: Updated: Department: Abstract: Fröhlich 26.
08.
98 OFW E UE K6257K is designed for quasi-split-sound, multistandard applications.
A BG channel with reduced group delay predistortion and a double nyquist path with flat group delay are selectable.
In this application note, a switching circuit with a test layout is proposed and the results are evaluated.
Application note SAW K6257K -1- OFW E UE Switchable SAW Filter K6257K - Application Notes General SAW filter OFW K6257K is designed for Multistandard applications (European standards), except M- and M-related standards.
A BG- channel with reduced group delay and a double nyquist path with flat group delay are selectable.
It is optimized for video-IF signals, used in combination with Quasisplit sound systems.
The filter comes in a flat DIP10K plastic case.
Our testboard will help to inform the user.
A proposal for a symmetric SAW driver output was worked out.
The IF driver of a tuner IC, TUA2007 is used here to provide real conditions on the SAW filter input side.
A SAW filters symmetrical output is terminated usually by the differential amplifier of an IF-IC.
Here we choose two common collector stages as buffer, the symmetric output is combined by widebandtransformer ( balun) to a practical unsymmetrical output for direct connection to a network analyzer.
The circuit Before the introduction of the switchable SAW filter type, one of a set of two separate SAW filters was switched alternately to the input of the IF amplifier.
Acceptable selectivity of the filter selected requires a circuitry with high attenuation of the unwanted signal path which has to be shortened and cut off at both output lines.
In addition the circuit is complicated in its layout design.
Such a circuit diagra is shown here: SAW filter OF K6257K, one type of a new generation, opened up a possibility to design a norm select with few components occupying a minimum on space.
Application note SA...


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