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參數(shù)資料
| 型號(hào)： | LA1245 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | AM Electronic Tuner |
| 中文描述： | 上午電子調(diào)諧器 |
| 文件頁(yè)數(shù)： | 5/11頁(yè) |
| 文件大?。?/td> | 326K |
| 代理商： | LA1245 |
LA1245
No.737-5/11
8. When a cable or something similar is connected to a local oscillation buffer (pin 20), which is equivalent to
connecting a capacitor of about 20pF, the output from the buffer will be of sawtooth waves, causing the level low at
the short wave band. To prevent this, connect a resistor between pin 20 and GND, which will increase the operating
current of the buffer amplifier. Since the maximum current obtained from pin 20 is 2mA, the suitable resistance
between pin 20 and GND is 1.5k
.
9. Use a semi-fixed resistor for R
211
to allow the fluctuation of V
SM
.
10. When changing an IFT or using an RF tuner, select a filter and related circuits according to the following conditions.
The input levels of each terminal where 30% modulated detection output of –25dBm is obtained are as follows :
Pin 11 input
when Rg=520
(470
+ 50
)
Pin 9 input
when Rg=50
Pin 6 input
when Rg=50
Pin 3 input
when Rg=50
Slight change in IFT, however, will be covered by changing the constant of resistors R
202
and R
204
.
11. When the coupling coefficient of the local oscillation coil is small and an anti-resonance point of about 100MHz is
present or the stray capacitance between pin 19 and pin 20 is large, the buffer output (pin 20) may be subject to
parasitic oscillation of about 100MHz. In this case, connect a capacitor of about 30pF between pin 20 and GND. To
observe parasitic oscillation, connect a capacitor of 5pF in series with the probe. If the probe is connected direct to
pin 20, the input capacitance of the probe causes parasitic oscillation to stop, which makes it impossible to observe.
75dBμ
53dBμ
48dBμ
22dBμ
Sample Application Circuit 1
Unit (resistance :
, capacitance : F)
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PDF描述 |
|---|---|
| LA1247 | AM ELECTRONIC TUNER |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LA1247 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:AM ELECTRONIC TUNER |
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| LA12540-PF-TBF-X | 制造商:LIGITEK 制造商全稱:LIGITEK electronics co., ltd. 功能描述:TAPE AND BOX TYPE LED LAMPS |
| LA1256 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Octal Peripheral Driver |
| LA125P | 制造商:LEM 制造商全稱:LEM 功能描述:CURRENT TRANSDUCER LA 125-P |
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