TDA7412 datasheet(22/56 Pages) STMICROELECTRONICS

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TDA7412

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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

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:

no external components necessary

PLL with adjustment free, fully integrated VCO

automatic pilot dependent MONO/STEREO switching

very high suppression of intermodulation and interference

programmable Roll-Off compensation

dedicated RDS-Softmute

Highcut- and Stereoblend-characterisctics programmable in a wide range

FM/AMNoiseblanker with several threshold controls

Multipath-detector with programmable internal/external influence

I2C-bus control of all necessary functions

OUTF

25K

FRONT

REAR

FROM MIXING

SELECTOR

D00AU1164

VOLUME

+15/-79dB

1dB Step

VOLUME

+15/-79dB

1dB Step

VOLUME

+15/-79dB

1dB Step

FROM OUTPUT

SELECTOR

OUTR

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