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參數(shù)資料
| 型號： | LA3401 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | VCO Non-Adjusting PLL FM MPX Stereo Demodulator with FM Accessories(帶FM附件VCO無需調(diào)整PLL FM MPX立體聲解調(diào)器) |
| 中文描述： | 壓控振蕩器非盈豐調(diào)整鎖相環(huán)調(diào)頻立體聲調(diào)頻解調(diào)器與配件（帶調(diào)頻附件壓控振蕩器無需調(diào)整盈豐鎖相環(huán)調(diào)頻立體聲解調(diào)器） |
| 文件頁數(shù)： | 10/15頁 |
| 文件大?。?/td> | 445K |
| 代理商： | LA3401 |
LA3401
No.1868–10/15
How to externd the dynamic range of the post amplifier
In the Sample Application Circuit of the LA3401 the dynamic range of the post amplifier is extended by connecting
resistors R12, R13 across the virtual GND points (pins 6, 7) of the post amplifier and GND as shown in Fig. 13 to set
the output (pins 5, 8) DC voltages to an adequate value.
The DC voltages on pins 5, 8 are obtained as follows :
3.3
R
B
+ R1
R
B
=3.3 1+R1
R
B
3.3
R
B
+ R2
R
B
=3.3 1+R2
R
B
The upper and lower loss voltages of the post amplifier output
are approximately 2V and 0.5V respectively as shown in Fig.
14. With these loss voltages considered, the voltages on pins
5, 8 are set.
In the Sample Application Circuit the voltages on pins 5, 8 are
set to 6V and the maximum output voltage is obtained at
V
CC
=13V.
The Sample Application Circuit provides the reduced
voltage characteristic at approximately 9V. If the reduced
voltage characteristic at approximately 6V is required,
remove R12, R13 shown in the Sample Application
Circuit. Then, the output (pins 5, 8) DC voltages becomes
approximately 3.3V and the reduced voltage characteristic
becomes as shown in Fig. 15. Fig. 15 shows the THD vs.
V
CC
characteristic, but other characteristics such as
separation are also available at V
CC
=6V by removing
R12, R13.
Low-pass filter
Fig. 16 shows a sample circuit configuration where an
LC filter is used as the low-pass filter and Fig. 17 shows
a sample characteristic of this filter. As compared with the LPF (BL-13) in the Sample Applicatin Circuit, the use of
this filter makes the attenuation less at 19kHz, 38kHz : therefore, carrier leak at the LPF output causes the stereo
distortion and separation characteristic to get worse than specified in the Operating Characteristics. For the stereo
distortion, the BL-13 provides approximately 0.02%, while the LC filter provides approximately 0.5%.
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| LA3410 | VCO Non-Adjusting PLL FM MPX Stereo Demodulator with FM Accessories(帶FM附件VCO無需調(diào)整PLL FM MPX立體聲解調(diào)器) |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LA3410 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:VCO Non-Adjusting PLL FM MPX Stereo Demodulator with FM Accessories |
| LA3420 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| LA343 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Optoelectronic |
| LA3430 | 制造商:Panasonic Industrial Company 功能描述:IC |
| LA3430M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:PLL FM MPX Stereo Demodulator with Pilot Canceler For Car Stereo Use |
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