TDA7402_07 Datasheet, PDF (29/71 Pages) STMicroelectronics – Car radio signal processor

TDA7402
Audioprocessor part
4.13
Subwoofer
Several different applications are possible with the subwoofer circuit:
1. Subwoofer filter OFF
a) Main source stereo (AC coupled)
b) Second source stereo (DC coupled)
c) Main source mono differential (DC coupled)
d) Second source mono-differential (DC coupled)
2. Subwoofer filter ON
a) Main source mono differential (DC coupled)
b) Second source mono differential (DC coupled)
c) Center speaker mode (filtered mono signal at SWL, unfiltered mono signal at
SWR)
In all applications the phase of the output-signal can be configured to be 0° or 180° . In the
center speaker mode only at the filtered output the phase is changed.
Figure 20. Application 1 using internal highpass and mono low pass filter
PROGRAMMING
5/1xxxxxxx
7/xxxxx1xx
10/xxxx10xx
12/1010xxxx
220nF
220nF
ACINF ACOUT ACINR
SWIN
MAIN SOURCE
LEFT CHANNEL
BASS-FILTER
VOICE BAND
BANDPASS
MAIN SOURCE
RIGHT CHANNEL
SECOND SOURCE
LEFT CHANNEL
SECOND SOURCE
25K
MS MONO
50K
50K 50K
25K
LOWPASS
25K
SEC.S MONO
25K
OFF/ON FC
SPEAKER FRONT
SPEAKER REAR
SPEAKER SUBWOOFER
D00AU1156
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