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TDA7409D

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P25
TDA7409
10/25
1.4.3 Low & High Frequency Boost
Figure 5 shows the different Loudness-shapes in low & high frequency boost.
Figure 5. Loudness Attenuation , f
C
= 2.4KHz
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 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 6).
For timing purposes the Bit 0 of the I2C-bus output register is set to 1 from the start of muting until the end of
de-muting.
Figure 6. 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.
Obsolete Product(s) - Obsolete Product(s)
11/25
TDA7409
1.6 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. Four
programmable soft step time from one step to the next, are user selectable.
Figure 7. SoftStep-Timing
Note: For steps more than 1dB the SoftStep mode should be deactivated because it could generate a 1dB error during the blend-time.
1.7 Bass
There are three parameters programmable in the bass stage:
1.7.1 Attenuation
Figure 8 shows the attenuation as a function of frequency at a center frequency of 80Hz.
Figure 8. Bass Control @ fC = 80Hz, Q = 1
-15.0
-10.0
-5.0
0.0
5.0
10.0
15.0
10.0 100.0 1.0K 10.0K
dB
Hz
Obsolete Product(s) - Obsolete Product(s)
TDA7409
12/25
1.7.2 Center Frequency
Figure 9 shows the four possible center frequencies 60, 80 ,100 and 200Hz.
Figure 9. Bass center Frequencies @ Gain = 15dB, Q = 1
1.7.3 Quality Factors
Figure 10 shows the four possible quality factors 1, 1.25, 1.5 and 2.
Figure 10. Bass Quality factors @ Gain = 14dB, fC = 80Hz
0.0
2.5
5.0
7.5
10.0
12.5
15.0
10.0 100.0 1.0K 10.0K
Obsolete Product(s) - Obsolete Product(s)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P25

TDA7409D

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Buy TDA7409D
Manufacturer:
STMicroelectronics
Description:
Audio DSPs INFOTAINMENT SIGNAL
Lifecycle:
New from this manufacturer.
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