參數(shù)資料
型號(hào)： 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(yè)數(shù)： 29/56頁(yè)
文件大小： 716K
代理商： TDA7412
35/56
TDA7412
of the normal noise-controlled trigger adjustment is fixed (fig. 24). In some cases the behavior of the noiseblank-
er can be improved by increasing the threshold even in a region of higher fieldstrength. Sometimes a wrong
triggering occurs for the MPX signal often shows distortion in this range which can be avoided even if using a
low threshold. Because of the overlap of this range and the range of the stereo/mono transition it can be con-
trolled by stereoblend. This increase of the threshold is programmable in 3 steps or switched off.
4.3.2 Over Deviation Detector
If the system is tuned to stations with a high deviation the noiseblanker can trigger on the higher frequencies
of the modulation or distortion. To avoid this behavior, which causes audible noise in the output signal, the
noiseblanker offers a deviation-dependent threshold adjustment. By rectifying the MPX signal a further signal
representing the actual deviation is obtained. It is used to increase the PEAK voltage. Offset and gain of this
circuit are programmable in 3 steps with the bits D6 and D7 of the noiseblanker-byte I (bit combination '00' turns
off the detector, see fig. 23).
4.3.3 Multipath-Level
To react on high repetitive spikes caused by a Multipath-situation, the discharge-time of the PEAK voltage can
be decreased depending on the voltage-level at pin MPout. The A679 offers a linear as well as a threshold driv-
en control. The linear influence of the Multipath-Level on the PEAK-signal (D7 of Multipath-Control-Byte) gives
a discharge slewrate of 1V/ms1 . The second possibility is to activate the threshold driven discharge which
switches on the 18kOhm discharge if the Multipath-Level is below 2.5V (D7 of noiseblanker-byte II-byte).
1 The slewrate is measured with RDischarge=infinite and VMPout=2.5V
AM mode of the Noiseblanker
The A679 noiseblanker is also suitable for AM noise cancelling. The detector uses in AM mode the 450kHz
unfiltered IF-output of the tuner for spike detection. A combination of programmable gain-stage and lowpass-
filter forms an envelope detector which drives the noiseblanker's input via a 120kHz 1.st order highpass. In order
to blank the whole spike in AM mode the hold-times of the sample and hold circuit are much longer then in FM
(640s to 1.2ms). All threshold controls can be used like in FM mode.
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(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*