TDA7402_07 Datasheet, PDF (28/71 Pages) STMicroelectronics – Car radio signal processor

Audioprocessor part
TDA7402
4.11
AC coupling
In some applications additional signal manipulations are desired, for example surround
sound or more band equalizing. For this purpose an AC coupling is placed before the
speaker attenuators, which can be activated or internally shorted by the I²C bus. In short
condition the input signal of the speaker attenuator is available at the AC outputs. The input
impedance of this AC Inputs is 50kΩ.
4.12
Output selector
The output-selector allows to connect the main- or the second-source to the front, rear and
subwoofer speaker attenuator, respectively. As an example of this programming the device
is able to connect via software the main source to the back (rear) and the second source to
the front (see Figure 17). In addition to this stage allows to setup different applications by
I²C bus programming. Three examples are given in Figure 18, 19, and 20.
Figure 19. Output selector
ACOUT ACINF ACINR SWIN
MAIN SOURCE
LEFT CHANNEL
VOICE BAND
BANDPASS
25K
MAIN SOURCE 25K
RIGHT CHANNEL
SECOND SOURCE
25K
25K
LEFT CHANNEL
SECOND SOURCE
MS MONO
50K 50K 50K
LOWPASS
SEC.S MONO
OFF/ON FC
SPEAKER FRONT
SPEAKER REAR
SPEAKER SUBWOOFER
D00AU1155
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