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參數(shù)資料
| 型號： | TDA7406T |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | CAR RADIO SIGNAL PROCESSOR |
| 中文描述： | 汽車無線電信號處理器 |
| 文件頁數(shù)： | 29/49頁 |
| 文件大?。?/td> | 823K |
| 代理商： | TDA7406T |
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TDA7406T
4.2 2.2. InGain + InFilter
The InGain stage allows to adjust the MPX-signal to an internal magnitude of about 1V
rms
which is the recom-
mended 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.
4.3 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 cancelled. For reaching a high channel separation the TDA7406T offers an I
2
C-bus pro-
grammable roll-off adjustment which is able to compensate the lowpass behavior of the tuner section. If the tun-
er's attenuation at 38kHz is in a range from 7.2% to 31.0% the TDA7406T 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 fieldstrength 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 characteristics which is programmable in a wide
range is described in 4.8.
4.4 De-emphasis and Highcut
The de-emphasis-lowpass allows to choose a time constant between 37.5 and 100μs. The highcut control range
will be 2 x
τ
Deemp
or 2.7 x
τ
Deemp
dependent on the selected time constant (see programming section). The bit
D7 of the hightcut-byte will shift time constant 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
τ
Deemp
. 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 I
2
C-bus (bit D7, Highcut byte set to “0”).
The setup of the highcut characteristics is described in 4.9.
4.5 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 demodula-
tion. The included pilot tone-detector enables the demodulation if the pilot tone reaches the selected pilot tone
threshold V
PTHST
. Two different thresholds are available. The detector output (signal STEREO, see Block dia-
gram) can be checked by reading the status byte of the TDA7406T via I
2
C-bus. During a Softmute the PLL can
be set into “Hold”-mode which freezes the PLL's state (bit D
4
, Softmute byte). After releasing the Softmute the
PLL will again follow the input signal only by correcting the phase error.
4.6 Fieldstrength Control
The fieldstrength input is used to control the highcut- and the stereoblend-function. In addition the signal can be
also used to control the noiseblanker thresholds and as input for the multipath detector. These additional func-
tions are described in sections 5.3 and 6.
4.7 LEVEL-Input and -Gain
To suppress undesired high frequency modulation on the highcut- and stereoblend-control signal the LEVEL
signal is lowpass filtered firstly. The filter is a combination of a 1.st-order RC-lowpass at 53kHz (working as anti-
aliasing filter) and a 1.st-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 “Stereodecoder-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 stereoblend stage (see fig. 24).
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| TDA7406 | Car radio signal processor |
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| TDA7409 | CARRADIO-SIGNAL-PROCESSOR |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA7406TR | 功能描述:音頻 DSP INFOTAINMENT 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 |
| TDA7407 | 功能描述:音頻 DSP Advanced car signal processor 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 |
| TDA7407_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Advanced car signal processor |
| TDA7407D | 功能描述:音頻 DSP INFOTAINMENT 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 |
| TDA7407DTR | 功能描述:IC PROCESSOR ADV SIGNAL 44-LQFP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻處理 系列:- 其它有關(guān)文件:STA321 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:Sound Terminal™ 類型:音頻處理器 應(yīng)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(yīng)商設(shè)備封裝:64-LQFP EP（10x10） 包裝:Digi-Reel® 其它名稱:497-11050-6 |
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