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參數(shù)資料
| 型號： | TDA7411 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), TONE CONTROL CIRCUIT, PQFP44 |
| 封裝： | 10 X 10 MM, 1.40 MM HEIGHT, TQFP-44 |
| 文件頁數(shù)： | 16/43頁 |
| 文件大?。?/td> | 617K |
| 代理商： | TDA7411 |
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23/43
TDA7411
FUNCTIONAL DESCRIPTION OF STERO DECODER
Figure 18. Block diagram of the stereo decoder
The stereo decoder-part of the TDA7411 (see Fig. 18) contains all functions necessary to demodulate the
MPX-signal like pilot tone-dependent MONO/STEREO-switching as well as "stereoblend" and "highcut".
Adaptations like programmable input gain, roll-off compensation, selectable deemphasis time constant
and a programmable field strength input allow using different IF-devices.
InGain + Infilter
The InGain stage allows adjusting the MPX-signal to a magnitude of about 1Vrms internally, which is the
recommended value. The 4.th order input filter has a corner frequency of 80kHz and is used to attenuate
spikes and noise and acts as an anti-aliasing filter for the following switch capacitor filters.
Demodulator
In the demodulator block the left and the right channel are separated from the MPX-signal. In this stage
also the 19-kHz pilot tone is canceled. For reaching a high channel separation the TDA7411 offers an I2C-
bus programmable roll-off adjustment, which is able to compensate the low pass behavior of the tuner sec-
tion. If the tuner's attenuation at 38kHz is in a range from 13.8% to 24.6% the A673 needs no external
network in front of the MPX-pin. Within this range an adjustment to obtain at least 40dB channel separation
is possible. The bits for this adjustment are located together with the field strength adjustment in one byte.
This gives the possibility to perform an optimization step during the production of the car radio where the
channel separation and the field strength control are trimmed. The setup of the stereoblend characteris-
tics, which is programmable in a wide range.
Deemphasis and Highcut
The deemphasis low pass allows to choose between a time constant of 50s and 75s (bit D7, stereo de-
coder byte). The highcut control range will be in both cases
τHC = 2x τDeemp. Inside the highcut control
range (between VHCH and VHCL) the LEVEL signal is converted into a 5-bit word, which controls the low
pass time constant between
τDeemp...3x τDeemp. Thereby the resolution will remain always 5 bits indepen-
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相關代理商/技術參數(shù) |
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| 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 |
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