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參數(shù)資料
| 型號(hào)： | LA7565BM |
| 元件分類(lèi)： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| 封裝： | MFP-24 |
| 文件頁(yè)數(shù)： | 7/17頁(yè) |
| 文件大小： | 292K |
| 代理商： | LA7565BM |
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Notes on Sanyo SAW Filters
There are two types of SAW filters, which differ in the piezoelectric substrate material, as follows:
1. Lithium tantalate (LiTaO3) SAW filter
TSF11 s
s s
s Japan
TSF12 s
s s
s US
Although lithium tantalate SAW filters have the low temperature coefficient of –18 ppm/°C, they suffer from a large
insertion loss. However, it is possible, at the cost of increasing the number of external components required, to minimize
this insertion loss by using a matching circuit consisting of coils and other components at the SAW filter output. At the
same time as minimizing insertion loss, this technique also allows the frequency characteristics, level, and other aspects
to be varied, and thus provides increased circuit design flexibility. Also, since the SAW filter reflected wave level is
minimal, the circuit can be designed with a small in-band ripple level.
2. Lithium niobate (LiNbO3) SAW filter
TSF52 s
s s
s US
TSF53 s
s s
s PAL
Although lithium niobate SAW filters have the high temperature coefficient of –72 ppm/°C, they feature an insertion loss
about 10 dB lower than that of lithium tantalate SAW filters. Accordingly, there is no need for a matching circuit at the
SAW filter output. Although the in-band ripple is somewhat larger than with lithium tantalate SAW filters, since they
have a low impedance and a small field slew, they are relatively immune to influences from peripheral circuit
components and the geometry of the printed circuit board pattern. This allows stable out-of-band trap characteristics to be
acquired. Due to the above considerations, lithium tantalate SAW filters are used in applications for the US and Japan
that have a high IF frequency, and lithium niobate SAW filters are used in PAL and US applications that have a low IF
frequency.
Notes on SAW Filter Matching
In SAW filter input circuit matching, rather than matching the IF frequency, flatter video band characteristics can be
acquired by designing the tuning point to be in the vicinity of the audio carrier rather than near the chrominance carrier.
The situation shown in figure on the right makes it easier to acquire flat band characteristics than that in figure on the left.
With the tuning set to the IF frequency
With the tuning set to the vicinity of S and C
No. 5636-15/17
LA7565B, 7565BM
The high band is reduced
SAW filter
characteristics
The high band is
extended
Frequency
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LA7565B | AM/FM, AUDIO/VIDEO DEMODULATOR, PDIP24 |
| LA7565E | AM/FM, AUDIO/VIDEO DEMODULATOR, PDIP24 |
| LA7565KM | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| LA75665M | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| LA75665NM | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LA7565E | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:IF Signal-Processing IC for PAL/NTSC Multi-System Audio TV and VCR Products(292.33 k) |
| LA7565GM | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述: |
| LA7565KM | 制造商:SANYO 制造商全稱(chēng):Sanyo Semicon Device 功能描述:IF Signal-Processing IC for PAL/NTSC Multi-System Audio TV and VCR Products |
| LA7566 | 制造商:SANYO 制造商全稱(chēng):Sanyo Semicon Device 功能描述:VIF/SIF IF Signal-Processing Circuit with TV/VCR PAL and NTSC Multisound Support |
| LA75665M | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述: |
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