Circuit Descriptions
7.
7.4.2
DVB-T2 DTV part
The Front-End for DVB-T2 DTV part consist of the following
key components:
•
TUNER EUROPE system ST42CS-2-E
•
SCALER NT72453MBG-BA/B TFBGA-466
•
DEMODULATOR NT78822QG/A Q
FN-48
for DVB-T2
DTV part
Below find a block diagram of the front-end application for
DVB-T2 DTV part.
Figure 7-7 Front-End DVB-T2 DTV block diagram
7.5
Front-End DVB-S(2) reception
The Front-End for the DVB-S(2) application consist of the
following key components:
•
TUNER EUROPE DNBU02112IH2
•
SCALER NT72453MBG-BA/B TFBGA-466
•
DEMODULATOR Si2166-B22-GMR QFN-48 for T/T2
Below find a block diagram of the front-end application for
DVB-S(2) reception.
Figure 7-8 Front-End DVB-S2 DTV block diagram
The application supports the following protocols:
•
Polarization selection via supply voltage ( 18V = horizontal,
13V = vertical)
•
Band selection via “toneburst” (22kHz): tone “on” = “high”
band, tone “off” = “low” band
•
Satellite ( LNB) selection via DiSEqC 2.0 protocol
•
Reception of DVB-S ( supporting QPSK encoded signals)
and DVB-S2 ( supporting QPSK, 8PSK encoded signals)
7.6
HDMI
Refer to figure
for the application.
Figure 7-9 HDMI input configuration
The following HDMI connector can be used:
•
HDMI 1: HDMI input ( TV digital interface support HDCP)
with digital audio/PC DVI input/ARC
•
HDMI 2: HDMI input ( TV digital interface support HDCP)
with digital audio/PC DVI input
•
+5V detection mechanism
•
Stable clock detection mechanism
•
HPD control
•
Sync detection
•
TMDS output control
•
CEC control
7.7
Video and Audio Processing -
NT72453MBG-BA
The NT72453MBG-BA is the main audio and video processor
(or System-on-Chip) for this platform. It has the following
features:
•
Multi-standard digital video decoder (MPEG-1, MPEG-2,
H.264, MPEG-4)
•
Integrated ISDB-T, DVB-T/DVB-C, ITU-T J.83B, ATSC
channel decoder
•
Integrated video and audio ADC
•
Integrated standby controller
•
2D-Graphic engine/OSD
•
Integrated USB2.0 high speed host controlle
•
Visual effect processor
•
Built-in 16bit DDR3-SDRAM KGD
The NT72453MBG-BA/D is an integrated TV system-on-chip
which complaints with variety ATV as NTSC,PAL and
SECAM,and DTV standards as ISDB-T,DVB-T/C, integrates
DTV and multi-media AV decoder,SIF demodulator,and
support A/V post-processing. The integrated video ADC and
video decoder support PC VGA port, YPbPr, SCART, CVBS
and S-Video Input. Regarding the tuner input, The digital VIF
performs the universal analog TV demodulation
(NTSC, PAL,
and SECAM), including IF processing, AGC, video
demodulation, and second sound IF generation (SSIF).The
video decoder supports universal TV video format. The
integrated audio ADC supports stereo audio input
corresponding to video input sources. The integrated TV sound
decoder supports universal TV sound format.The advanced
picture quality and color engine create more vivid image
impression than ever. The HDMI receiver v1.4a, supports deep
color, CEC features and 3D formats. The USB high speed host
supports updating firmware code, multi-media playback from
the external USB flash devices.The standby controller can
operate sololy from the main system, powered by the standby
power source from power module, consumes as low current as
possible. It meets the requirement of Green appliance.
For a functional diagram of the NT72453MBG-BA, refer
to
.
IF
T
S
DA
T
A
RF_AGC
NT72453
Demod
NT78822QG/A
IF_AGC
ST42CS-2-E
I
2
C
IF-AGC
I
2
C
I
2
C
20060_205.eps
TS DATA
IP/IN/OP/ON
Tuner I2C
Tuner I2C
System I2C
NT7245
3
MBG-BA/B
LNB power
Si2166
S2 tuner
S2 function
20060_206.eps
20060_207.eps
NT72453MBG
HDMI1
HDMI 2
CN501
CN502
RX
RX
I
2
C
I
2
C
