TDA7402_07 datasheet(28/71 Pages) STMICROELECTRONICS

28 / 71 page

Audioprocessor part

TDA7402

28/71

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 50k

Ω.

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

VOICE BAND

BANDPASS

LOWPASS

MS MONO

MAIN SOURCE

RIGHT CHANNEL

MAIN SOURCE

SPEAKER FRONT

SWIN

ACINR

ACINF

OFF/ON

ACOUT

SPEAKER REAR

SPEAKER SUBWOOFER

D00AU1155

LEFT CHANNEL

SECOND SOURCE

25K

50K

25K

SEC.S MONO

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