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AUDIO_12V
PWR_12V
1404 mA
1367 mA
500 mA
7.4
Front-End Analogue and DVB-T, DVB-C;
ISDB-T reception
7.4.1
DVB-T/C DTV part
The Front-End for DVB-T/C DTV part consist of the following
key components:
•
TUNER EUROPE system ST42CS-2-E
•
SCALER NT72453MBG-BA/B TFBGA-466
Below find a block diagram of the front-end application for
DVB-T/C DTV part.
ST42CS-2-E
2
I
C
IF_AGC
IF_AGC
Figure 7-4 Front-End DVB-T/C DTV block diagram
BUCK CONVERTER
BUCK CONVERTER
+5V_STB
M5723B
TPS54428
U701
2866 mA(5V)
285mA
U706
PWR_ON_2
PWR_ON_2
POWER SWITCH
+5V_STB
AO4449
Q701
2581 mA(5V)
PWR_ON_2
Figure 7-3 DC/DC converters
I
2
C
IF
NT725453
19790_204.eps
Circuit Descriptions
DV11
1050mA
11mA
+5V_SW
1500 mA
LDO
+5V_SW
AZ1117_1.35A
U203_SOT-223
230 mA
230 mA
POWER protect
+5V_SW
G5250M1T1U
U102
80 mA
80 mA
CI_PWR_EN
LDO
+5V_SW
AP3417C
U702
640 mA
BUCK CONVERTER
AZ1117CD
U705
BUCK CONVERTER
AP3417C_1.2A
+5V_SW
U703_SOT_23_5
295 mA
110 mA
PWR_ON_2
Depend on panel
FB751
POWER SWITCH
+5V_SW
PANEL_VCC
AON4421
PWR_12V
Q750
1367 mA
FB750
PANEL_VCC_ON/OFF
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 QFN-48 for DVB-T2
DTV part
Below find a block diagram of the front-end application for
DVB-T2 DTV part.
ST42CS-2-E
RF_AGC
Figure 7-5 Front-End DVB-T2 DTV block diagram
back to
div. table
TPN15.1E LA
AUDIO AMP
1.3A
AD87588
MAIN CHIP
NT72453
MAIN CHIP
NAND FLASH
K9F1G08U0D
NT72453
-SIB0
1mA
10mA
USB multi-media
USB
MHL
TUNER
TUNER
LG_Tuner
TCL_Tuner
DVB-S/S2
DVB-C/T/T2
+3V3_TUNER
PCMCIA CARD
VCC_CI
CI CARD PWR
MAIN CHIP
DV33
NT72567BG
370 mA
S2_DEMOD
T2_DEMOD
SI2166
AVDD1V2
NT78822
U201
U201
455 mA
MAIN CHIP
NT72453
DV15
PANEL_T-CON
FB411
LVDS_VDD
PANEL_22"~55"
+5V or +12V
1367 mA
FB412
LNB POWER
+12V_SW
MP8126
U202
500 mA
2
I
C
2
I
C
IF
IF-AGC
IF_AGC
NT72453
7.
EN 47
19790_202.eps
Demod
NT78822QG/A
2
I
C
19790_205.eps
2015-Oct-30
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