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參數(shù)資料
| 型號： | TDA7407 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP44 |
| 封裝： | 10 X 10 MM, 1.40 MM HEIGHT, LQFP-44 |
| 文件頁數(shù)： | 21/46頁 |
| 文件大?。?/td> | 692K |
| 代理商： | TDA7407 |
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Product(s)
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Multipath detector
TDA7407
5.2.4
De-emphasis and Highcut.
The lowpass filter for the de-emphasis allows to choose between a time constant of 50
μs
and 75
μs (bit D7, stereo decoder byte).
The highcut control range will be in both cases
τ
HC = 2 τDeemp. 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 τDeemp. There by the resolution will
remain always 5 bits independently of the absolute voltage range between the VHCH and
VHCL values.
The highcut function can be switched off by I2C bus (bit D7, fieldstrength byte set to "0").
5.2.5
PLL and pilot tone detector
The PLL has the task to lock on the 19kHz pilotone during a stereo transmission to allow a
correct demodulation. The included 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 block diagram) can be checked by reading the status
byte of the TDA7407 via I2C bus.
5.2.6
Field strength control
The fieldstrength input is used to control the high cut and the stereoblend function. In
addition the signal can be also used to control the noiseblanker thresholds and as input for
the multipath detector.
Figure 21.
Relation between internal and external LEVEL voltage and setup of
stereoblend
Figure 22.
High cut characteristics
INTERNAL
VOLTAGES
t
D97AU639
VSBL
REF 5V
SETUP OF VST
INTERNAL
VOLTAGES
t
33%
REF 5V
SETUP OF VMO
LEVEL
LEVEL INTERN
FIELDSTRENGHT VOLTAGE
VST
VMO
LEVEL INTERN
42%
50%
58%
VSBL
VST
VMO
FIELDSTRENGHT VOLTAGE
LOWPASS
TIME CONSTANT
D97AU640
τDeemp
FIELDSTRENGHT
VHCH
VHCL
3
τDeemp
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| TDA7407TR | 功能描述:處理器 - 專門應(yīng)用 Advanced car signal processor RoHS:否 制造商:Freescale Semiconductor 類型:Multimedia Applications 核心:ARM Cortex A9 處理器系列:i.MX6 數(shù)據(jù)總線寬度:32 bit 最大時鐘頻率:1 GHz 指令/數(shù)據(jù)緩存: 數(shù)據(jù) RAM 大小:128 KB 數(shù)據(jù) ROM 大小: 工作電源電壓: 最大工作溫度:+ 95 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MAPBGA-432 |
| TDA7409 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:CARRADIO-SIGNAL-PROCESSOR |
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