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參數(shù)資料
| 型號： | TDA7409 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | CARRADIO-SIGNAL-PROCESSOR |
| 中文描述： | CARRADIO信號處理器 |
| 文件頁數(shù)： | 8/25頁 |
| 文件大小： | 296K |
| 代理商： | TDA7409 |
TDA7409
8/25
1.2 AutoZero
In order to reduce the number of pins there is no AC coupling between the In-Gain and the following stage, so
that any offset generated by or before the In-Gain-stage would be transferred or even amplified to the output.
To avoid that effect a special Offset-cancellation-stage called AutoZero is implemented. This stage is located
before the Mixing-block to eliminate all offsets generated by the Input-Stages and the In-Gain (Please notice
that externally generated offsets, e.g. generated through the leakage current of the coupling capacitors, are not
canceled).
The auto-zeroing is started every time the DATA-BYTE 0 (Input Selector/Gain) is selected and takes a time of
max.
0.3ms
. To avoid audible clicks the Audioprocessor is muted before the loudness stage during this time.
1.2.1 AutoZero-Remain
In some cases, for example if the uP is executing a refresh cycle of the IIC-Bus-programming, it is not useful
to start a new AutoZero-action because no new source is selected and an undesired mute would appear at the
outputs. For such applications the TDA7409 could be switched in the
AutoZero-Remain-Mode
(I2 bit of the
subaddress-byte). If this bit is set to high, the DATABYTE 0 could be loaded without invoking the AutoZero and
the old adjustment-value remains.
1.3 Mixing Stage
The 4 step Mixing stage offers the possibility to mix the rear selector signal or the phone signal to any other
source. Due to the fact that the mixing-stage is located behind the In-Gain-stage fine adjustments of the main
source level could be done in this way.
Figure 2. Signal-Flow of Mixing-Stage
1.4 Loudness
There are four parameters programmable in the loudness stage:
1.4.1 Attenuation
Figure 3 shows the attenuation as a function of frequency at f
C
= 400Hz.
SE1
INGAIN
MIXING
LOUDNESS
MIXING LEVEL
INPUT
/
BEEP
25K
0dB
-3.5dB
-6dB
-12dB
-100dB
-9.6dB
-6dB
-2.5dB
INPUT SELECTOR
+
-
SE2
SE3
SE4
BEEP
D00AU1181
/
/
/
/
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TDA7409D | CARRADIO-SIGNAL-PROCESSOR |
| TDA7410ND | Signal processor for car radio applications |
| TDA7410NDTR | Signal processor for car radio applications |
| TDA7411 | ADVANCED CAR SIGNAL PROCESSOR |
| TDA7412 | CARRADIO SIGNAL PROCESSOR |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA7409D | 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 |
| TDA7409DTR | 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 |
| TDA7410D | 制造商:STMicroelectronics 功能描述: |
| TDA7410ND | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Signal processor for car radio applications |
| TDA7410NDTR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Signal processor for car radio applications |
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