Circuit Descriptions
EN 51Q552.2E LA 7.
2011-Jun-01
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7. Circuit Descriptions
Index of this chapter:
7.1 Introduction
7.2 Power Supply
7.3 DC/DC Converters
7.4 Front-End Analogue and DVB-T, DVB-C; ISDB-T reception
7.5 Front-End DVB-S(2) reception
7.6 HDMI
7.7 Video and Audio Processing - PNX855xx
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,
you will find a separate drawing for clarification.
7.1 Introduction
The Q552.2E LA is part of the TV550 platform, is a derivative
from the Q552.1E LA and uses the (same) PNX855xx chipset.
The major deltas versus its predecessor Q551 are:
• support of DVB-T2 (“second generation” DVBT)
• implementation of “passive” 3D
• removal of TCON from the SSB (comes with the display)
• changed power architecture
• new USB hub (for Sundance xxPFL76xx/xx sets).
The Q552.2E LA chassis comes with the following stylings:
• Blockbuster (series xxPFL66xx),
• Sundance (series xxPFL76xx).
7.1.1 Implementation
Key components of this chassis are:
• PNX855xx System-On-Chip (SOC) TV Processor
• TX26xx Hybrid Tuner (DVB-T/C, analogue)
• STV6110AT DVB-S Satellite Tuner
• SII9x87 HDMI Switch
• TPA312xD2PWP Class D Power Amplifier
• LAN8710 Dual Port Gigabit Ethernet media access
controller.
7.1.2 TV550 Architecture Overview
For details about the chassis block diagrams refer to chapter 9.
Block Diagrams. An overview of the TV550 2011 architecture
can be found in Figure 7-1
.
Figure 7-1 Architecture of TV550 platform 2011
19100_059_110217.eps
110217
NXP
PNX85500
SOC
DVB-T (EU)
DVB-C (EU+HK)
Hybrid
Tu ner
DVB-S2
Tu ner
DVB-S2 (EU)
HDMI 1.3
mux
Ethernet
PHY
SD-CARD
32
FLASH
512MB
NVM
8kB
CI
DDR2
4x 128MB-533
LVDS only
AL
SPI
64kB
buffer
Matrix
FHD@120p
FHD@100p
DC/DC
1V1
1V8
2V5
3V3
5V
Stdby
3V3
USB
WIFI
3D
IR
CLASS-D
CPLD
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