參數(shù)資料
型號(hào)： KB22688
廠商： SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述： TV Sound MPX for Two Carrier System(載波系統(tǒng)的電視聲音多路轉(zhuǎn)換器)
中文描述： 電視聲音盈豐雙載波系統(tǒng)（載波系統(tǒng)的電視聲音多路轉(zhuǎn)換器）
文件頁(yè)數(shù)： 11/22頁(yè)
文件大?。?/td> 140K
代理商： KB22688
KB22688 TV SOUND MPS FOR TWO CARRIER SYSTEM
OPERATION DESCRIPTION
x
System
KB22688 consists of IF AMP, FM DET, AGC, MATRIX, u-COM INTERFACE and ID DET blocks.
All blocks are non-abjust operable and available for Korea standard broadcast system.
y
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 above 3 MHz .
z
FM DET
KB22688 adopts non-adjust double-PLL type FM detection circuits.
1st PLL has a role of chasing FM carrier frequency with wide holding range ( for example, hold range is
±
2MHz ) and 2nd PLL does actual FM detection with narrow holding range ( about
±
300KHz ), its free
running frequency is equal to FM carrier frequency that is detected by 1st PLL as mentioned before,
the free running frequency of 2nd PLL is determined by 1st PLL and the free running frequency of
2nd PLL can be varied according to FM carrier frequency ( Korea is 4.5MHz ).When 100% FM modulated
signal is provided, the amplitude of the output signal at FM output port is 100mVrms.
{
AGC
The AGC block comprises AGC detector part and CCA part ( Current control Amplifier ).The MATRIX output
signal level is set to 370mVrms when applied 100% modulated FM signal and supply voltage is 5V. As the gain
of CCA is about 5dB and the gain of matrix is 6dB , so the output signal level of CCA is 185mVrms and the
matrix output is 370mVrms. If over- modulated ( over 200% ) FM signal is added to KB22688 input port, the output
will be clipped by supply voltage dynamic limitation range ( The linear amplify range is limited lower than 800mVrms).
To prevent this problem, In KB22688 we use AGC circuit to reduce the gain of CCA part when the over- modulated
FM signal has been applied, AGC circuit is deactivated until the modulation is over 200 %. If AGC is activated,
the THD and separation characteristes of output signal would be deteriorated because the gain of CCA is varied
according to modulation ratio.
|
MATRIX
MATRIX part separates provided FM detected signal into MONO, STEREO, BILINGUAL, and SUB according to
braodcast status and end user’ s setting , it mainly consists of analog switches and operational amplifiers.
The input and output signal format of MATRIX is shown as follows.
INPUT
Broadcast Mode
Remark
S2
S1
STEREO
BILINGUAL
MONO
* can be MAIN
L - R
SUB
NONE *
L + R
MAIN
MAIN
OUTPUT
Broadcast Mode
MONO
SUB
BILINGUAL
STEREO
STEREO
BILINGUAL
MONO
ROUT
2 R
MAIN
MAIN
LOUT
2 L
MAIN
MAIN
ROUT
L + R
SUB
MAIN
LOUT
L + R
MAIN
MAIN
ROUT
L + R
MAIN
MAIN
LOUT
L + R
MAIN
MAIN
ROUT
L + R
SUB
MAIN
LOUT
L + R
SUB
MAIN
User Select
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