- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄373622 > TDA7411 (意法半導體) ADVANCED CAR SIGNAL PROCESSOR PDF資料下載
參數(shù)資料
| 型號： | TDA7411 |
| 廠商： | 意法半導體 |
| 英文描述： | ADVANCED CAR SIGNAL PROCESSOR |
| 中文描述： | 先進的汽車信號處理器 |
| 文件頁數(shù)： | 26/43頁 |
| 文件大?。?/td> | 581K |
| 代理商： | TDA7411 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁當前第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁
TDA7411
26/43
Figure 22. Block diagram of the noise blanker
In a first stage the spikes must be detected but to avoid a wrong triggering on high frequency (white) noise
a complex trigger control is implemented. Behind the trigger stage a pulse former generates the "blank-
ing"-pulse. An own biasing circuit supplies the noise blanker in order to avoid any cross talk to the signal
path.
Trigger Path
The incoming MPX signal is high pass filtered, amplified and rectified. This second order high pass filter
has a corner-frequency of 140kHz. The rectified signal, RECT, is low pass filtered to generate a signal
called PEAK. Also noise with a frequency 140kHz increases the PEAK voltage. The resulting voltage can
be adjusted by use of the noise rectifier discharge current. The PEAK voltage is fed to a threshold gener-
ator, which adds to the PEAK-voltage a DC-dependent threshold VTH. Both signals, RECT and
PEAK+VTH are fed to a comparator, which triggers a re-triggerable monoflop. The monoflop's output ac-
tivates the sample-and-hold circuits in the signal path for the selected duration.
Automatic Noise Controlled Threshold Adjustment (ATC)
There are mainly two independent possibilities for programming the trigger threshold:
1. the low threshold in 8 steps (bits D
0
to D
2
of the noise blanker byte)
2. and the noise adjusted threshold in 4 steps (bits D
3
and D
4
of the noise blanker-byte, see fig. 15).
The low threshold is active in combination with a good MPX signal without any noise; the PEAK voltage
is less than 1V. The sensitivity in this operation is high.
If the MPX signal is noisy (low fieldstrength) the PEAK voltage increases due to the higher noise, which is
also rectified. With increasing of the PEAK voltage the trigger threshold increases, too. This particular gain
is programmable in 4 steps (see fig. 17).
+
-
RECTIFIER
LOWPASS
RECT
+
+
THRESHOLD
GENERATOR
VTH
PEAK
ADDITIONAL
THRESHOLD
CONTROL
MONOFLOP
HOLDN
MPX
modAU856
MPOUT
CONTROL
相關PDF資料 |
PDF描述 |
|---|---|
| TDA7412 | CARRADIO SIGNAL PROCESSOR |
| TDA7415CB | Car radio multimedia signal processor |
| TDA7416 | CARRADIO SIGNAL PROCESSOR |
| TDA7417 | Car radio audio processor |
| TDA7417TR | Car radio audio processor |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TDA7411TR | 功能描述:IC PROCESSOR CAR SIGNAL 44TQFP RoHS:否 類別:集成電路 (IC) >> 線性 - 音頻處理 系列:- 其它有關文件:STA321 View All Specifications 標準包裝:1 系列:Sound Terminal™ 類型:音頻處理器 應用:數(shù)字音頻 安裝類型:表面貼裝 封裝/外殼:64-LQFP 裸露焊盤 供應商設備封裝:64-LQFP EP（10x10） 包裝:Digi-Reel® 其它名稱:497-11050-6 |
| TDA7412 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:CARRADIO SIGNAL PROCESSOR |
| TDA7415 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| TDA7415CB | 功能描述:音頻放大器 Car-radio Multimedia Signal (CMSP) 6-chnl RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TDA7415CBTR | 功能描述:音頻放大器 Car-radio Multimedia Signal (CMSP) 6-chnl RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
發(fā)布緊急采購，3分鐘左右您將得到回復。