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參數(shù)資料
| 型號(hào)： | LA7578N |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | IF Signal Processing (Super PLL-II VIF + SIF) Circuit for TVs and VCRs(用于電視機(jī)/VCR應(yīng)用的IF信號(hào)處理（超鎖相環(huán)II VIF+SIF）電路) |
| 中文描述： | 中頻信號(hào)處理（超鎖相環(huán)-Ⅱ資料表格應(yīng)力強(qiáng)度因子）的電視和錄像機(jī)電路（用于電視機(jī)/錄像機(jī)應(yīng)用的中頻信號(hào)處理（超鎖相環(huán)二資料表格強(qiáng)度因子）電路） |
| 文件頁(yè)數(shù)： | 11/18頁(yè) |
| 文件大小： | 237K |
| 代理商： | LA7578N |
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Fig. 12
Pins 5 and 6 (VIF input)
These are the VIF amplifier input pins. The inputs must always
have their DC components eliminated with capacitors. The
inputs are equilibrium inputs.
The input impedance is R
6
1.5 k
, C
6
3 pF.
Sanyo’s SAW filter
There are two types of filters, depending on the piezoelectric substrate material.
(1) LiTaO
3
(lithium tantalate) SAW filters: ...... TSF1xxx
TSF2xxx
While the LiTaO
3
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., for 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) LiNbO
3
(lithium niobate) SAW filter: ...... TSF5xxx
While the LiNbO
3
SAW filter has a high temperature coefficient of –72 ppm/°C, it has a lower insertion loss by about 10 dB
compared to the LiTaO
3
SAW filters. Therefore, matching on the output side of the SAW filter is not necessary. (Refer to Fig.
14.)
In addition, because the insertion loss is low (although the ripple within the band is somewhat higher than in the case of the
LiTaO
3
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 LiTaO
3
SAW filter is suitable for Japan and U.S. bands where the IF frequency is high, while
the LiNbO
3
SAW filter is suitable for PAL and U.S. bands where the IF frequency is low.
0.01μF
Fig. 13
Fig. 14
0.01μF
LA7578N
No.4952-11/18
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| LA7583 | IF Signal Processing Circuit (A 2 C PLL VIF + SIF) for TVs and VCRs(用于電視機(jī)/VCR應(yīng)用的IF信號(hào)處理（自動(dòng)調(diào)整控制 鎖相環(huán) VIF+SIF）電路) |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LA7583 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:IF Signal Processing Circuit (A2C PLL VIF + SIF) for TVs and VCRs |
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| LA7600 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| LA7601 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Consumer IC |
| LA7601W | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Consumer IC |
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