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參數(shù)資料
| 型號： | TDA7402TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP44 |
| 封裝： | 10 X 10 MM, 1.40 MM HEIGHT, TQFP-44 |
| 文件頁數(shù)： | 14/74頁 |
| 文件大小： | 1232K |
| 代理商： | TDA7402TR |
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TDA7402
Audioprocessor part
4.4
SoftMute
The digitally controlled SoftMute stage allows muting/demuting the signal with a I2C bus
programmable slope. The mute process can either be activated by the SoftMute pin or by
the I2C-bus. This slope is realized in a special S-shaped curve to mute slow in the critical
regions (see
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.
Softmute timing
Note:
Please notice that a started mute action is always terminated and could not be interrupted
by a change of the mute -signal.
4.5
SoftStep 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 audiosignal. With the SoftStep 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.
SoftStep timing
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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