Philips 32PF9968/10 Service Manual page 72

EN 72 9. LC7.2E PA
Table 9-5 Pin assignment analogue tuners
Pin number Description
1 RF AGC voltage
2 n.c.
2
3 I C-bus address select
4 SCL
5 SDA
6 n.c.
7 supply voltage
8 n.c.
9 tuning supply voltage
10 n.c.
11 TV IF output
The pin assignment of the hybrid tuner can be found in table
"Pin assignment hybrid tuner".
Table 9-6 Pin assignment hybrid tuner
Pin number Description
1 n.c.
2 RF AGC voltage
2
3 I C-bus address select
4 SCL
5 SDA
6 4 MHz reference output
7 supply voltage
8 broadband IF output
9 IF AGC voltage
10 narrowband IF output
11 narrowband IF output
9.4.2 Automatic Gain Control
During analogue reception, the hybrid tuner receives an
external AGC voltage, coming from the demodulator to perform
automatic gain control. During digital reception, no external
AGC voltage is used but the tuners internal AGC loop is used.
9.5.2 Supply
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Circuit Descriptions, Abbreviation List, and IC Data Sheets
DC voltage (V)
3.3 - 4.5 (weak or no signal)
< 3.3 (strong signal)
0
0 to 3.3
0 to 3.3
5 ±0.25
33
DC voltage (V)
3.3 - 4.5 (weak or no signal)
< 3.3 (strong signal)
0
0 to 3.3
0 to 3.3
5 ±0.25
0 to 3
9.5 DVB-T Signal Processing
The DVB-T cell on the SSB is built around the "MOJO" MPEG
decoder PNX8314HS (item 7G00) and receives the signal from
the COFDM Channel Decoder TDA10046 (item 7F01). The
(hybrid) tuner TD1316AF (item 1101) supports digital (DVB-T)
reception and transports the signal via the VIM_IBO and
VIP_IBO lines. The digital data stream exits the DVB-T cell
when it is fed to the Trident SVP CX32 Video Processor (item
7202). A Common Interface (CI) slot allows reception of
encoded signals when used with a Conditional Access Module
(CAM) in combination with a smart card. See figure "Block
diagram DVB-T reception" for details.
1V2_MOJO
1V8S_SW
3V3_MOJO
4MHz CLK
RF_AGC_IBO
TDA10046
CI SLOT Channel
(STV0700) Decoder
TDA_SDA
LPF
TXD0
MOJO
RXD0
I 2 S (SD, WS, SCLK)
LC07 EU DVB Cell
Figure 9-6 Block diagram DVB-T reception
9.5.1 Common Interface (CI)
Introduction
The digital sets of this chassis are provided with a special slot
called Common Interface (CI). Together with a Conditional
Access Module (CAM) and a smart card, it is possible to
receive scrambled TV programs. This means that it is not
necessary to have a separate Set Top Box to receive digital
cable SDTV and HDTV programs (however this still is
possible).
The removable smart card, distributed by cable companies,
allows you to tune digital and high definition scrambled or
encrypted cable channels through the cable antenna. The
smart card is also required to receive premium digital TV
channels and services (where available) through the cable. A
smart card functionality includes conditional access and copy
protection.
Implementation
1. The receiver receives the digital data stream.
2. The data flows into the Conditional Access Module, which
contains the content provider's unscrambling algorithms.
3. This module verifies the existence of a smart card that
contains the subscriber's authorization code.
4. If the authorization code is accepted, the CAM
unscrambles the data and returns the data to the receiver
(if the code is not accepted, the data remains scrambled,
restricting access).
5. The receiver then decodes the data and outputs it for
viewing.
The internal voltages that are used are:
• 5 V (+5V_SW)
SDA
HYBRID
MUX
SCL
TUNER
IF_AGC_IBO
VIP_IBO
VIM_IBO
TDA_SCL
IBO_R,G,B
IBO_CVBS
IBO_I 2 C_SD
IBO_I 2 C_SCL
IBO_IRQ
TRIDENT/uP
RESET_n
FLASH
SDRAM
Multi
Sound
Processor
DVB_SW
I 2 C_SDA
I 2 C_SCL
SCART 2
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