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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)： | 22/46頁 |
| 文件大小： | 692K |
| 代理商： | TDA7407 |
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Product(s)
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Product(s)
TDA7407
Multipath detector
5.2.7
LEVEL Input and Gain
To suppress undesired high frequency modulation on the highcut and stereoblend function
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 device (see
Testmode section 5 LEVELINTERN).
The gain is widely programmable in 16 steps from 0dB to 10dB (step = 0.67dB). These 4
bits are located together with the roll off bits in the "Stereo decoder adjustment" byte to
simplify a possible adaptation during the production of the car radio.
5.2.8
Stereoblend control
The stereoblend control block converts the internal LEVEL voltage (LEVEL INTERN) into an
demodulator compatible analog signal which is used to control the channel separation
between 0dB and the maximum separation. Internally this control range has a fixed upper
limit which is the internal reference voltage REF5V. The lower limit can be programmed
between 29.2% and 58%, of REF5V in 4.167% steps (see Figure 21).
To adjust the external LEVEL voltage to the internal range two values must be defined: the
LEVEL gain LG and VSBL (see Figure 21). To adjust the voltage where the full channel
separation is reached (VST) the LEVEL gain LG has to be defined. The following equation
can be used to estimate the gain:
The gain can be programmed through 4 bits in the "Stereo Decoder Adjustment" byte.
The MONO voltage VMO (0dB channel separation) can be choosen selecting VSBLAll
necessary internal reference voltages like REF5V are derived from a bandgap circuit.
Therefore they have a temperature coefficient near zero. This is useful if the fieldstrength
signal is also temperature compensated.
But most IF devices apply a LEVEL voltage with a TC of 3300ppm. The TDA7407 offers this
TC for the reference voltages, too. The TC is selectable with bit D7 of the "stereo decoder
adjustment" byte.
5.2.9
Highcut control
The highcut control setup is similar to the stereoblend control setup: the starting point VHCH
can be set with 2 bits to be 42, 50, 58 or 66% of REF5V whereas the range can be set to be
17, 22, 28 or 33% of VHCH (Figure 22).
5.2.10
Functional description of the noiseblanker
In the automotive environment the MPX signal is disturbed by spikes produced by the
ignition, for example; the wiper motor. The aim of the noiseblanker part is to cancel the
audible influence of the spikes.
Therefore the output of the stereo decoder is held at the actual voltage for a time between
22 and 38
μs (programmable).
L
G
REF5V
Field strenght voltage [STEREO]
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相關代理商/技術參數(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:- 其它有關文件:STA321 View All Specifications 標準包裝:1 系列:Sound Terminal™ 類型:音頻處理器 應用:數(shù)字音頻 安裝類型:表面貼裝 封裝/外殼:64-LQFP 裸露焊盤 供應商設備封裝: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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