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參數(shù)資料
| 型號： | TDA7460NDTR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO20 |
| 封裝： | ROHS COMPLIANT, SOP-20 |
| 文件頁數(shù)： | 21/49頁 |
| 文件大?。?/td> | 473K |
| 代理商： | TDA7460NDTR |
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Stereo decoder part
TDA7460ND
5.5.2
Input stages
The In gain stage allows to adjust 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.
5.5.3
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 TDA7460ND offers an I2C bus programmable roll-off adjustment which is able to
compensate the lowpass behavior of the tuner section. If the tuner attenuation at 38kHz is in
a range from 20.2% to 31% the TDA7460ND needs no external network before the MPX pin.
Within this range an adjustment to obtain at least 40d B 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 fieldstrength control are trimmed.
Figure 22.
Signals during stereo decoder's soft mute
5.5.4
De-emphasis and high cut
The lowpass filter for the de-emphasis allows to choose between a time constant of 50ms
and 75ms (bit D7, Stereo decoder byte).
The high cut control range will be in both cases tHC = 2 tDeemp. Inside the high cut control
range (between VHCH and VHCL) the LEVEL signal is converted into a 5 bit word which
controls the lowpass time constant between tDeemp...3 tDeemp. There by the resolution will
remain always 5 bits independently of the absolute voltage range between the VHCH and
VHCL values.
The high cut function can be switched off by I2C bus (bit D7, Fieldstrength byte set to "0").
SOFTMUTE
COMMAND
STD MUTE
VO
t
D97AU638
t
相關(guān)PDF資料 |
PDF描述 |
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| TDA7461ND | SPECIALTY CONSUMER CIRCUIT, PDSO28 |
| TDA7461NDTR | SPECIALTY CONSUMER CIRCUIT, PDSO28 |
| TDA7461N | SPECIALTY CONSUMER CIRCUIT, PDIP28 |
| TDA7462D | SPECIALTY CONSUMER CIRCUIT, PDSO28 |
| TDA7463AD | 2 CHANNEL(S), TONE CONTROL CIRCUIT, PDSO20 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA7461 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:CAR RADIO SIGNAL PROCESSOR |
| TDA7461D | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:CAR RADIO SIGNAL PROCESSOR |
| TDA7461N | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:CAR RADIO SIGNAL PROCESSOR |
| TDA7461N_03 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:CAR RADIO SIGNAL PROCESSOR |
| TDA7461ND | 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 |
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