- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄98195 > TDA7412 (STMICROELECTRONICS) 1 CHANNEL(S), TONE CONTROL CIRCUIT, PQFP44 PDF資料下載
參數(shù)資料
| 型號： | TDA7412 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻控制 |
| 英文描述： | 1 CHANNEL(S), TONE CONTROL CIRCUIT, PQFP44 |
| 封裝： | 10 X 10 MM, 1.40 MM HEIGHT, TQFP-44 |
| 文件頁數(shù)： | 30/56頁 |
| 文件大小： | 716K |
| 代理商： | TDA7412 |
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頁第26頁第27頁第28頁第29頁當前第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頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁
TDA7412
36/56
5.0 FUNCTIONAL DESCRIPTION OF THE MULTIPATH-DETECTOR
Using the Multipath-Detector the audible effects of a multipath condition can be minimized. A multipath-condi-
tion is detected by rectifying the spectrum around 19kHz in the fieldstrength signal. An external capacitor is used
to define the attack- and decay-times for the Stereoblend (see blockdiagram, fig. 32). Due to the very small
charge currents this capacitor should be a low leakage current type (e.g ceramic). Using this configuration an
adaptation to the user's requirement is possible without effecting the "normal" fieldstrength input (LEVEL) for
the stereodecoder. This application is given in fig. 32. Another (internal) time constant is used to control the
Highcut through the multipath detector
Selecting the "internal influence" in the configuration byte the Stereo-Blend and/or the Highcut is automatically
invoked during a multipath condition according to the voltage appearing at the MP_OUT-pin.
Figure 30. Blockdiagram of the Multipath-Detector
6.0 QUALITY DETECTOR
The A679 offers a quality detector output which gives a voltage representing the FM-reception conditions. To
calculate this voltage the MPX-noise and the multipath-detector output are summed according to the following
formula :
VQual = 1.6 (VNoise-0.8 V)+ a (REF5V-VMpout).
The noise-signal is the PEAK-signal without additional influences (see noiseblanker description). The factor 'a'
can by programmed to 0.7 .... 1.15. The output is a low impedance output able to drive external circuitry as well
as simply fed to an AD-converter for RDS applications.
7.0 TESTMODE
During the Testmode, which can be activated by setting bit D0 and bit D1 of the stereodecoder testing-byte, sev-
eral internal signals are available at the FD2R+ pin. During this mode the input resistance of 100kOhm is dis-
connected from the pin. The internal signals available are shown in the Data-byte specification.
INT.
INFLUENCE
CHARGE
0.25
A/0.5A
FAST
CHARGE
300
A
LEVEL
D00AU1166
LOWPASS
2.2KHz
BANDPASS
19KHz
RECTIFIER
SHIFT
0 ... 1.5V
LOWPASS
100Hz
=
LOWPASS
53KHz
INT.
INFLUENCE
MP HOLD
GAIN 2 bits
MP_IN
to HCC
to SB
470nF
MP_OUT
VDD
=
VDD
High-Cut-Infl.
Attach<500
s
Decay=2/10ms
Stereoblend-Infl.
Attach=1ms
Decay=4/8s
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TDA7415CB | SPECIALTY ANALOG CIRCUIT, PQFP64 |
| TDA7416 | 1 CHANNEL(S), EQUALIZER CIRCUIT, PQFP44 |
| TDA7417TR | 1 CHANNEL(S), EQUALIZER CIRCUIT, PQFP32 |
| TDA7417 | 1 CHANNEL(S), EQUALIZER CIRCUIT, PQFP32 |
| TDA7418TR | SPECIALTY CONSUMER CIRCUIT, PDSO20 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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(fēng)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TDA7416 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:CARRADIO SIGNAL PROCESSOR |
| TDA7416_11 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Car radio signal processor |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。