Circuit Descriptions
EN 34 RAM1.0L LA7.
2010-Jul-02
7.3 MT8222 Video/Audio processor
Refer to figure Figure 7-4 for the power architecture of this
platform.
Figure 7-4 MT8222 Video/Audio system application
7.3.1 Signal paths
RGB
Analogue RGB signals are transferred by the MT8222 to a
digital signal by the internal A/D converter. The MT8222
generates an LVDS signal to the TL2428 on-chip TCON which
drives the LCD display.
HDMI
HDMI signals are further processed digitally by the MT8222.
The MT8222 generates an LVDS signal to the TL2428 on-chip
TCON which drives the LCD display.
Component Input
Component signals are processed by the MT8222. The
MT8222 generates an LVDS signal to the TL2428 on-chip
TCON which drives the LCD display.
Audio is separately processed by the MT8222 and further
processed by the CS4344 and then the audio amplifier.
RF Input
RF input signals are demodulated by the TDA9885 IF
demodulator and further processed by the MT8222. The signal
is then split into an video and an audio part.
The video signal is further processed by the MT8222 which
generates an LVDS signal to the TL2428 on-chip TCON which
drives the LCD display.
The audio signal is further processed by the MT8222 and split
into two parts. One part drives the Stereo Line Driver “AUDIO
OUT” chain, the other part drives the CS4344 and the audio
amplifier.
19000_202_100629.eps
100629
PRST#
U19
MX25L3205DM2I-12G
NT5TU32M16CG-25C
Amp R+
Audio Amp
U23
TPA3101D2PHPR
U22
DATA
Amp L-
Amp L+
Amp R-
IR_
DATA
ADIN 0
TD A9885TSV5
U10
Y1
4 MHz
REF
LED 2
ADIN 0
AT24C32C N- SH-T
EEPROM
U29
TCON
LVDS
U36
TL2428MC
VIF(K3953M)
SAW1
VIF
SIF(M3970M)
SAW2
SIF
TC VBS-N&P
AT24C02
AT24C02
VGA EDID
EEPROM
Data Bus 2
Data Bus 1
OPWR0 5V H1
HDMI DDC I2C
T-CON I
2
C
HDMI DDC I2C
OPWR0 5V H2
U16
U15
U6
RGB & H/V SYNC
o
oo
o
EEPROM
EEPROM
AV1 L/R IN
VGA L/R IN
VGA I
2
CVGA I
2
C
SC1 IN
SY1 IN
AV1 IN
Y1 IN
YPBPR1 L/R IN
PR1 IN
PB1 IN
AL2 & AR2 OUT
MT8222
U17
Tuner
Line OUT
VGA Audio Input
AV1 Input
CVI-1 Input
VGA Input
PB2 IN
Y2 IN
YPBPR2 L/R IN
PR2 IN
CVI-2 Input
HDMI1
HDMI2
USB
DRV602PWR
U26
LINE OUT R/L
CS4344
U37
I2S DAC
IF Tuner
AGC Tuner
Tuner SCL/SDA
U7
Channel Swit ch
74HC4052PW
Channel 2
Channel 3
Channel 1
USB DM
Debug PORT
RX
TX
USB DP
Y2
27MHz
KEY BD
Reset
Circuit
LCD PANEL
T CON
SIGNAL
DDR
Flash
Y6
CSTCE10M0G55
IR BD
I
2
S
10MH z
DAC L
DAC R
T-CON I
2
C
Scaler UART
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