参数资料
型号: TDA7412
厂商: STMICROELECTRONICS
元件分类: 音频控制
英文描述: 1 CHANNEL(S), TONE CONTROL CIRCUIT, PQFP44
封装: 10 X 10 MM, 1.40 MM HEIGHT, TQFP-44
文件页数: 6/56页
文件大小: 716K
代理商: TDA7412
TDA7412
14/56
1.4.3 Loudness Order
Different shapes of 1st and 2nd-Order Loudness
Figure 4. 1st and 2nd Order Loudness @ Attn. = 15dB, fP=400Hz
1.4.4 Flat Mode
In flat mode the loudness stage works as a 0dB to -19dB attenuator.
1.5 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 spe-
cial S-shaped curve to mute slow in the critical regions (see Figure 5).
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 5. 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.
dB
Hz
-20.0
-15.0
-10.0
-5.0
0.0
10.0
100.0
1.0K
10.0K
1
EXT.
MUTE
+SIGNAL
REF
-SIGNAL
1
I
2C BUS
OUT
Time
D97AU634
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