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參數(shù)資料
| 型號： | S1A0688C01-A0B0 |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | TV SOUND MPX FOR TWO CARRIER SYSTEM |
| 中文描述： | 電視伴音盈豐的兩個航母系統(tǒng) |
| 文件頁數(shù)： | 11/20頁 |
| 文件大?。?/td> | 179K |
| 代理商： | S1A0688C01-A0B0 |
TV SOUND MPX FOR TWO CARRIER SYSTEM
S1A0688C01
11
OPERATION DESCRIPTION
SYSTEM
S1A0688C01 consists of IF AMP, FM DET, AGC, MATRIX, U-COM Control INTERFACE and ID DET blocks. All
blocks are operable and available without adjust for Korea standard broadcast system.
IF AMP BLOCK
This block amplifies the provided IF signal to a detectable level of FM DET. Total gain is over 60dB and bandwidth
is about 3
10MHz.
FM DET
S1A0688C01 adopts non-adjust double-PLL type FM detection circuits. First PLL has a role of chasing FM carrier
frequency with wide holding range (for example, hold range is 2MHz) and second PLL does actual FM detection
with narrow holding range (about 300kHz), The free running frequency of 2nd PLL is same as the lock frequency of
1 st. PLL, and free running frequency of 1 st. PLL is determined by internal Resistor and Capacitor. The free run-
ning frequency can be varied by the variation of resistor and capacitor.
AGC
The AGC block comprises AGC detector part and CCA part (Current control Amplifier). The MATRIX output signal
level is set to 400mVrms when applied 100% modulated FM signal and supply voltage is 5V. As the gain of CCA is
about 6 dB and the gain of matrix is 6dB, so the output signal level of CCA is 200 mVrms and the matrix output is
400 mVrms. If over- modulated (over 200%) FM signal is added to S1A0688C01 input port, the output will be
clipped by supply voltage dynamic limitation range (The linear amplify range is limited lower than 800 mVrms).
To prevent this problem, In S1A0688C01 we use AGC circuit to reduce the gain of CCA part when the over- modu-
lated FM signal has been applied, AGC circuit is deactivated until the modulation is over 200%. If AGC is activated,
the THD and separation characteristics of output signal would be deteriorated because the gain of CCA is varied
according to modulation ratio.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| S1A0900X01 | AM/FM TUNER + MPX |
| S1A0900X01-A0B0 | AM/FM TUNER + MPX |
| S1A0900X01-S0B0 | AM/FM TUNER + MPX |
| S1A0901A01 | AM/FM TUNER + MPX |
| S1A0901A01-S0B0 | AM/FM TUNER + MPX |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| S1A0900X01 | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:AM/FM TUNER + MPX |
| S1A0900X01-A0B0 | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:AM/FM TUNER + MPX |
| S1A0900X01-S0B0 | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:AM/FM TUNER + MPX |
| S1A0901A01 | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:AM/FM TUNER + MPX |
| S1A0901A01-S0B0 | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:AM/FM TUNER + MPX |
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