Circuit Descriptions
7.
7.
Circuit Descriptions
Index of this chapter:
7.1 Introduction
7.3 Power Supply
7.2 Video and Audio Processing - MT822x
Notes:
•
Only
new
circuits (circuits that are not published recently)
are described.
•
Figures can deviate slightly from the actual situation, due
to different set executions.
•
For a good understanding of the following circuit
descriptions, please use the wiring, block (see chapter
9. Block Diagrams) and circuit diagrams (see chapter
10. Circuit Diagrams and PWB Layouts). Where
necessary, a separate drawing for clarification is given.
7.1
Introduction
Key components of this chassis are:
•
MT8222 Mediatek Scaler IC.
•
R8C11Renesas Stand-by microprocessor.
•
TEDE8 Tuner.
•
TDA9886 IF Demodulator.
•
WM8501 D/A Converter.
•
STA333BW Audio Amplifier.
Main differences with the TCM3.1A are the better performance
of the video processor, an extra HDMI connector, and
multimedia playback via the USB connector.
7.1.1
Architecture Overview
•
For details about the chassis block diagrams refer to
chapter 9. Block Diagrams. An overview of the MT8222
architecture can be found in
Figure 7-1 Block diagram of MT822x
7.2
Video and Audio Processing - MT822x
The MediaTek MT822x is an ultra high integrated single chip
for flat panel TV. It supports multimedia video/audio input and
output format up to full HDTV.
It includes an advanced 3D comb filter/TV decoder to retrieve
the best image from popular composite signals and embedded
HDTV/VGA decoders for high bandwidth input signals.
The new 4th generation advanced motion adaptive and motion
estimation de-interlacer converts accordingly the interlaced
video into a progressive one with overlay of a 2D graphic
processor.
Independent two flexible scalers provide wide adoption to
various LCD panels for two different video sources at the same
time.
The on-chip audio processor decodes the analogue signals
from the tuner with lip sync control, delivering high quality post-
processed sound effects to the audio amplifier stage.
An on-chip microprocessor reduces the system BOM and
shortens the schedule of UI design by high level C
programming.
ATV CVBS
TUNER I2C
TV
CVBS OUT
AUDIO IN BUS
CEC
VCC
VIF
SIF
SAW-D94
53D
OFF
ON
HDMI1
HDM2
EDID
EDID
VGA
EDID
YPbPr
SCART1
AV IN
SPDIF
PANEL
LVDS
TUNER
TDQG4-601A
SAW-K72
70M
TDA9
886T
FLASH
64Mbit
TV_CVBS
SIF
SCL
SDA
I2C
R08C11
KEY POWER ON
STANDBY IR
KEY BOARD
KEY
IR
EEPROM
M24C64MN
DC-DC
12V to 5V
POWER
SUPPLY CONNECTOR
MT22 BLOCK DIAGRAM_V0.2
SCART2
CVBS
Y/C
RGB
YPbPr
CVBS
RGB
HDM3
EDID
CVBS
AV OUT
PC AUDIO
VIDEO
SWITCH
CVBS IN
Y/C IN
MONITOR OUT
CVBS IN
RGB IN
FS
FB
Y
Pb
Pr
RGB
VSYNC
HSYNC
CVBS
IN
SPDIF
OUT
HDMI_Rx I2C
R0/L0 OUT
R1/L1 OUT
R2/L2 OUT
I2S IN
I2S
VIDEO
OUT
LVDS OUT
MT8221/22R
ADC
CVBS DECODER
3D COMB FILTER
SCALER
LVDS TRANSIMITER
HDMI RECEIVER
AUDIO DECODER
Media player
˖
Mpeg2/4
ˈ
Divx
AVI
ˈ
Mp3,Jpeg
ˈ
RM
Game
CRYSTAL
MEMOFR
Y IF
DDR IF
USB
USB
IF
AUDIO
SWITCH
AUDIO
SWTICH
RX
TX
TX,RX
DDR1
ADC
AUDIO
AMP for
19”
R
L
CLASS D
AMP
AUDIO
AMP for
19”
Audio
Amp
DAC
HEAD PHONE
1
8
520_200_090
3
11.ep
s
090
3
11
