參數(shù)資料
型號(hào)： TDA7406
廠商： 意法半導(dǎo)體
英文描述： Car radio signal processor
中文描述： 車載無(wú)線電信號(hào)處理器
文件頁(yè)數(shù)： 24/64頁(yè)
文件大小： 825K
代理商： TDA7406
Description of the audioprocessor part
TDA7406
24/64
cutoff frequencies are not equal but shifted by the factor 1.125 to get a flat frequency
response (see
Figure 14
).
Figure 14.
Subwoofer Application with Lowpass @ 80/120/160Hz and HighPass @
90/135/180Hz
4.8
Spectrum analyzer
A fully integrated seven band spectrum analyzer with programmable quality factor is present
in the IC (
Figure 15
).
The spectrum analyzer consists of seven band pass filters with a rectifier and sample
capacitor which stores the maximum peak signal level since the last read cycle. This peak
signal level can be read by a microprocessor at the SA
out
pin. To allow easy interfacing to a
microprocessor analog port, the output voltage at this pin is referred to device ground.
The microprocessor starts a read cycle when there is a clock edge going negative at the
SA
clk
input. On the following positive clock edges, the peak signal level for the band pass
filters is subsequently switched to SA
out
. Each analog output data is valid after the time
t
SAdel
.
A reset of the sample capacitors is induced whenever SA
clk
remains high for the time t
intres
.
Note that a proper reset requires the clock signal SA
clk
to be held at high potential. Figure 15
shows the block diagram and
Figure 16
illustrates the read cycle timing of the spectrum
analyzer.
The spectrum analyzer minimum repeat time is 50ms.
4.8.1
Spectrum Analyzer Filters
Each filter is realized as a switched capacitor with a 2nd order frequency response. The
center frequency of the filter stages are: 62,157, 396, 1K, 2.51K, 6.34k and 16kHz. It is
possible to choose between two different filter quality factors: 1.8 and 3.5.
dB
Hz
-50.0
-40.0
-30.0
-20.0
-10.0
0.0
10.0
100.0
1.0K
10.0K
相關(guān)PDF資料
PDF描述
TDA7407 ADVANCED CAR SIGNAL PROCESSOR
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA7406T 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:CAR RADIO SIGNAL PROCESSOR
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
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