參數(shù)資料
型號： TDA7402
廠商： STMICROELECTRONICS
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP44
封裝： 10 X 10 MM, 1.40 MM HEIGHT, TQFP-44
文件頁數(shù)： 35/69頁
文件大?。?/td> 865K
代理商： TDA7402
Functional description of stereo decoder
TDA7402
the channel separation and the fieldstrength control are trimmed. The setup of the stereo
blend characteristics which is programmable in a wide range is described in Chapter 5.8.
5.4
De-emphasis and highcut
The de-emphasis lowpass allows to choose a time constant between 37.5 and 100s. The
highcut control range will be 2 x
τ
Deemp or 2.7 x τDeemp dependent on the selected time
constant (see programming section). The bit D7 of the hightcut-byte will shift timeconstant
and range.
Inside the highcut control range (between VHCH and VHCL) the LEVEL signal is converted
into a 5 bit word which controls the lowpass time constant between
τ
Deemp...3 (3.7) x τDeemp.
Thereby the resolution will remain always 5 bits independently of the absolute voltage range
between the VHCH and VHCL values. In addition the maximum attenuation can be fixed
between 2 and 10dB.
The highcut function can be switched off by I2C bus (bit D7, Highcut byte set to "0").
The setup of the highcut characteristics is described in Chapter 5.9.
5.5
PLL and pilot tone detector
The PLL has the task to lock on the 19kHz pilot tone during a stereo transmission to allow a
correct demodulation. The included pilot tone-detector enables the demodulation if the pilot
tone reaches the selected pilot tone threshold VPTHST. Two different thresholds are
available. The detector output (signal STEREO, see Figure 2: Block diagram) can be
checked by reading the status byte of the TDA7402 via I2C-bus. During a Soft Mute the PLL
can be set into "Hold"-mode which freezes the PLL's state (bit D4, Soft Mute byte). After
releasing the Soft Mute the PLL will again follow the input signal only by correcting the
phase error.
5.6
Fieldstrength control
The fieldstrength input is used to control the highcut and the stereo blend function. In
addition the signal can be also used to control the noiseblanker thresholds and as input for
the multipath detector. These additional functions are described in sections 5.3 and 6.
5.7
EVEL input and gain
To suppress undesired high frequency modulation on the highcut- and stereo blend-control
signal the LEVEL signal is lowpass filtered firstly. The filter is a combination of a 1st order
RC lowpass at 53kHz (working as anti-aliasing filter) and a 1st-order switched capacitor
lowpass at 2.2kHz. The second stage is a programmable gain stage to adapt the LEVEL
signal internally to different IF devices (see Testmode section 5: LEVELHCC). The gain is
widely programmable in 16 steps from 0dB to 6dB (step=0.4dB). These 4 bits are located
together with the Roll-Off bits in the "Stereo decoder adjustment" byte to simplify a possible
adjustment during the production of the car radio. This signal controls directly the Highcut
stage whereas the signal is filtered again (fc=100Hz) before the stereo blend stage
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PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA7402_07 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Car radio signal processor
TDA7402TR 功能描述:音頻 DSP Car Radio Signal RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube
TDA7403 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:BASIC SIGNAL PROCESSOR
TDA7403_02 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:BASIC SIGNAL PROCESSOR
TDA7403D 功能描述:音頻 DSP Basic Signal Process RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube
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