TDA7406 Datasheet, PDF (26/64 Pages) STMicroelectronics – Car radio signal processor

Description of the audioprocessor part
Figure 17. AC/DC-coupling and Mix_In Inputs
TDA7406
4.10
Speaker-Attenuator stage
Each of the four speakers and the subwoofer output has a separate volume control in the
range: +15... -79dB plus mute with a typical value of -90dB.
4.11
Output Mixer
A Mixing-stage is placed after each speaker gain/attenuator stage and can be set
independently to mixing-mode.
Having a full volume control for the Mix-signal in the range:+15... -79dB plus mute with a
typical value of -90dB, the stage offers a wide flexibility to adapt the mixing levels.
Figure 18. Output Selector
4.12
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Audioprocessor Testing
During the Test Mode, which can be activated by setting bit I₂ of the subaddress byte and
D₀ of the audioprocessor testing byte, several internal signals are available at the Navi pin.
During this mode the input resistance of 100kΩ is disconnected from the pin. The internal
signals available are shown in the Data-byte specification.