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| 型号： | TDA7402 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP44 |
| 封装： | 10 X 10 MM, 1.40 MM HEIGHT, TQFP-44 |
| 文件页数： | 13/69页 |
| 文件大小： | 865K |
| 代理商： | TDA7402 |
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Audioprocessor part
TDA7402
3.5
Soft Mute
The digitally controlled Soft Mute stage allows muting/demuting the signal with a I2C bus
programmable slope. The mute process can either be activated by the Soft Mute pin or by
the I2C-bus. This slope is realized in a special S-shaped curve to mute slow in the critical
regions (see Figure 7).
For timing purposes the Bit0 of the I2C bus output register is set to 1 from the start of muting
until the end of de-muting.
Figure 7.
Soft Mute timing
Note:
Please notice that a started mute action is always terminated and could not be interrupted
by a change of the mute -signal.
3.6
Soft Step volume
When the volume level is changed audible clicks could appear at the output. The root cause
of those clicks could either be a DC offset before the volume stage or the sudden change of
the envelope of the audio signal. With the Soft Step feature both kinds of clicks could be
reduced to a minimum and are no more audible. The blend time from one step to the next is
programmable in four steps.
Figure 8.
Soft Step timing
Note:
For steps more than 0.5dB the Soft Step mode should be deactivated because it could
generate a hard 1dB step during the blend time.
1
EXT.
MUTE
+SIGNAL
REF
-SIGNAL
1
I
2C BUS
OUT
Time
D97AU634
1dB
0.5dB
-0.5dB
-1dB
Time
D00AU1170
VOUT
SS Time
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| TDA7403D | SPECIALTY CONSUMER CIRCUIT, PDSO20 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TDA7402_07 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Car radio signal processor |
| TDA7402TR | 功能描述:音频 DSP Car Radio Signal RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
| TDA7403 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:BASIC SIGNAL PROCESSOR |
| TDA7403_02 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:BASIC SIGNAL PROCESSOR |
| TDA7403D | 功能描述:音频 DSP Basic Signal Process RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
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