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LA7583 bảng dữ liệu(PDF) 14 Page - Sanyo Semicon Device

tên linh kiện LA7583
Giải thích chi tiết về linh kiện  IF Signal Processing Circuit (A2C PLL VIF SIF) for TVs and VCRs
PDF  15 Pages
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nhà sản xuất  SANYO [Sanyo Semicon Device]
Trang chủ  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

LA7583 bảng dữ liệu(HTML) 14 Page - Sanyo Semicon Device

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Notes on Sanyo SAW Filters
There are two types of filters, depending on the piezoelectric substrate material.
(1) LiTaO3 (lithium tantalate) SAW filters: .......TSF1xxx
TSF2xxx
While the LiTaO3 SAW filters offer excellent stability with a low temperature coefficient of –18 ppm/ °C, the insertion
loss is high. However, by using a coil, etc., to obtain proper matching on the SAW filter output side (which does increase
the number of external components), it is possible to suppress the insertion loss while at the same time making the level
of the characteristics variable, which provides additional design freedom. (Refer to Fig. 13.) In addition, because the SAW
(surface wave) reflection is small, ripple within the band can be kept low.
(2) LiNbO3 (lithium niobate) SAW filter: ......TSF5xxx
While the LiNbO3 SAW filter has a high temperature coefficient of –72 ppm/ °C, it has a lower insertion loss by about 10
dB compared to the LiTaO3 SAW filters. Therefore, matching on the output side of the SAW filter is not necessary. (Refer
to the diagram below.) In addition, because the insertion loss is low (although the ripple within the band is somewhat
higher than in the case of the LiTaO3 SAW filter), the low impedance and small feedthrough diminish the effects of
peripheral circuit components and the pattern layout, and make it possible to stabilize the trap characteristics outside of
the band.
From the above, it is clear that the LiTaO3 SAW filter is suitable for Japan and U.S. bands where the IF frequency is
high, while the LiNbO3 SAW filter is suitable for PAL and U.S. bands where the IF frequency is low.
(a) Picture wide BAND SAW Filter
Japan
TSF1137U
U.S.
TSF1241U(with IS-31 Trap)
(b) INTER Carrier SAW Filter
Japan
TSF1138P
U.S.
TSF1220P
LiTaO3 SAW Filter
LiNbO3 SAW Filter
LA7583
No.5177-14/15



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