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EN 22
7.
TCM3.1A LA
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.
DC-DC
12V to 5V
ON
OFF
VCC
R08C11
KEY POWER ON
STANDBY IR
KEY BOARD
FLASH
64Mbit
DDR1
HDMI1
EDID
EDID
HDM2
CEC
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.
2010-Jun-25
All manuals and user guides at all-guides.com
Circuit Descriptions
POWER
SUPPLY CONNECTOR
EEPROM
TUNER
TX,RX
M24C64MN
TDQG4-601A
I2C
RX
SCL
TX
SDA
KEY
IR
MT8221/22R
ADC
CVBS DECODER
MEMOFR
3D COMB FILTER
Y IF
SCALER
LVDS TRANSIMITER
HDMI RECEIVER
AUDIO DECODER
DDR IF
Media player Mpeg2/4 Divx
AVI Mp3,Jpeg RM
Game
CRYSTAL
RGB
SPDIF
CVBS
VSYNC
HDMI_Rx I2C
OUT
IN
HSYNC
EDID
HDM3
SPDIF
AV IN
VGA
Figure 7-1 Block diagram of MT822x
7.1
Introduction
Key components of this chassis are:
•
MT8221 Mediatek Scaler IC.
•
R8C11Renesas Stand-by microprocessor.
•
TEDE8 Tuner.
•
TDA9886 IF Demodulator.
•
WM8501 D/A Converter.
•
STA333BW Audio Amplifier.
7.1.1
Architecture Overview
•
For details about the chassis block diagrams refer to
chapter 9. Block Diagrams. An overview of the MT8221
architecture can be found in
SIF
SAW-D94
53D
TDA9
886T
VIF
SAW-K72
70M
ATV CVBS
TUNER I2C
TV_CVBS
SIF
LVDS OUT
VIDEO
OUT
R0/L0 OUT
R1/L1 OUT
R2/L2 OUT
I2S IN
CVBS IN
Y
RGB IN
CVBS IN
Pb
FS
Y/C IN
Pr
FB
MONITOR OUT
CVBS
CVBS
EDID
RGB
Y/C
YPbPr
SCART1
SCART2
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.
Figure
7-1.
MT22 BLOCK DIAGRAM_V0.2
LVDS
CLASS D
VIDEO
AMP
SWITCH
I2S
DAC
ADC
AUDIO
SWTICH
USB
IF
AUDIO
SWITCH
Audio
Amp
AUDIO IN BUS
PC AUDIO
AV OUT
USB
HEAD PHONE
18520_200_090311.eps
PANEL
AUDIO
AMP for
19"
R
AUDIO
AMP for
L
19"
090311
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