Multi Standard Sound Processor; Video Switch Tea6415; Audio Amplifier Stage With Tpa3004D2 - Hitachi 42PD3200A Service Manual

I²C
help, Audio amplifier and mute time constant, -bus transceivers and MAD (module address), Internal
voltage stabilizer.

4. MULTI STANDARD SOUND PROCESSOR

The MSP34x0G family of single-chip Multistandard Sound Processors covers the sound processing of
all analogue TV-Standards worldwide, as well as the NICAM digital sound standards. The full TV sound
processing, starting with analogue sound IF signal-in, down to processed analogue AF-out, is
performed on a single chip.
These TV sound processing ICs include versions for processing the multichannel television sound
(MTS) signal conforming to the standard recommended by the Broadcast Television Systems
Committee (BTSC). The DBX noise reduction, or alternatively, Micronas Noise Reduction (MNR) is
performed alignment free. Other processed standards are the Japanese FM-FM multiplex standard
(EIA-J) and the FM Stereo Radio standard.
Current ICs have to perform adjustment procedures in order to achieve good stereo separation for
BTSC and EIA-J. The MSP 34x1G has optimum stereo performance without any adjustments.

5. VIDEO SWITCH TEA6415

In case of three or more external sources are used, the video switch IC TEA6415 is used. The main
function of this device is to switch 8 video-input sources on the 6 outputs.
Each output can be switched on only one of each input. On each input an alignment of the lowest level
of the signal is made (bottom of sync. top for CVBS or black level for RGB signals).
Each nominal gain between any input and output is 6.5dB.For D2MAC or Chroma signal the alignment
is switched off by forcing, with an external resistor bridge, 5VDC on the input. Each input can be used
as a normal input or as a MAC or Chroma input (with external Resistor Bridge). All the switching
possibilities are changed through the BUS. Driving 75ohm load needs an external resistor. It is possible
to have the same input connected to several outputs.

6. AUDIO AMPLIFIER STAGE WITH TPA3004D2

The TPA3004D2 is a 12-W (per channel) efficient, Class-D audio amplifier for driving bridged-tied
stereo speakers. The TPA3004D2 can drive stereo speakers as low as 4 . The high efficiency of the
TPA3004D2 eliminates the need for external heatsinks when playing music.
Stereo speaker volume is controlled with a dc voltage applied to the volume control terminal offering a
range of gain from –40 dB to 36 dB. Line outputs, for driving external headphone amplifier inputs, are
also dc voltage controlled with a range of gain from –56 dB to 20 dB.
An integrated 5-V regulated supply is provided for powering an external headphone amplifier.
2