TDA7412 Datasheet, PDF (22/56 Pages) STMicroelectronics – CARRADIO SIGNAL PROCESSOR

TDA7412
1.13 Speaker-Attenuator and Mixing
A Mixing-stage is placed after each speaker-attenuator and can be set independly to mixing-mode. Having a full
volume for the Mix-signal the stage offers a wide flexibility to adapt the mixing levels.
Figure 19. Output Selector
FRONT
FROM OUTPUT
SELECTOR
REAR
VOLUME
+15/-79dB
1dB Step
25K
VOLUME
+15/-79dB
1dB Step
25K
FROM MIXING
SELECTOR
VOLUME
+15/-79dB
1dB Step
25K 25K
1
OUTF
1
OUTR
D00AU1164
1.14 Audioprocessor Testing
During the Testmode, which can be activated by setting bit D₀ of the stereodecoder testing-byte and the audio-
processor testing byte, several internal signals are available at the FD2R- pin. During this mode the input re-
sistance of 100kOhm is disconnected from the pin. The internal signals available are shown in the Data-byte
specification.
2.0 STEREODECODER PART
2.1 FEATURES:
s no external components necessary
s PLL with adjustment free, fully integrated VCO
s automatic pilot dependent MONO/STEREO switching
s very high suppression of intermodulation and interference
s programmable Roll-Off compensation
s dedicated RDS-Softmute
s Highcut- and Stereoblend-characterisctics programmable in a wide range
s FM/AMNoiseblanker with several threshold controls
s Multipath-detector with programmable internal/external influence
s I²C-bus control of all necessary functions
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