Philips 32PF9968/10 Service Manual page 51

Circuit Descriptions, Abbreviation List, and IC Data Sheets
9.3 Feature Description
The combo tuner supports both NTSC and ATSC RF signal.
For the analog part, it build in analog video demodulator,
decode the analog RF signal to CVBS, and deliver this CVBS
signal to MT5381 for further video processing. and at the same
time deliver the 2nd IF signal, fed to MT5381 for audio
demodulator and further audio processing.
For Digital part, It also deliver IF signal, fed to MT5381 for
further processing.
MT5381 merge MT5112 channel decoder, it is designed to
support 8 VSB in full compliance with ATSC terrestrial Digital
Television Standard. its basic function is to recover the digital
data encoded into the broadcast signal, which include video
and audio program information and ancillary data service. the
device outputs the demodulated data as a standard MPEG-2
transport stream in within parallel or serial format.
It also support free QAM with cable system.
The MT5381 platform support different source:
9.4 I/O PIN Definition
CN100 to Power
CN401 to Keyb.
CN402 to IR/LED
CN451 to ITV
a. CN100
Supply: From Power supply to Scaler: 2.0mm PITCH
Pin No. Pin Name.
1 INVERT_ON_OFF
2 BRIGT_ADJ
3 +12V
4 +12V
5 GND
6 GND
CN750 to Panel
CN403 for ISP/ComPair/ITV
Figure 9-2 Input and Output Connectors
Remarks
Normal: high
Max: full duty
TPM1.2HU LA
AV1/AV2 support two YPbPr component inputs, they can
support SD/HD format.
Side AV support CVBS, YC signal share with same audio.
HDMI support HDMI / DVI input, the DVI audio share with side
AV connector.
All the input source video signal will directly fed to MT5381 for
video part further processing.
MT5381 merge Codec IC, so the audio signal also will fed to
MT5381 directly, the audio signal fed to build in MUX, select
and digitalize, then fed these audio data to next block for audio
processing.
MT5381 also support DAC, it can transfer the processing digital
audio data to analog signal then fed to audio amplifier. it need
extra headphone amplifier, in case need support headphone
signal to earphone.
The MT5381 support dual channel LVDS signal, connect these
LVDS signal to panel for display picture.
CN504 to Speaker L CN505 to Speaker R
Pin No. Pin Name.
7 GND
8 +24V
9 +24V
10 STAND BY
11 STB_PWR5V
12 STB_PWR5V
b. CN401
9. EN 51
CN500 for ECE Code
updated
I_17940_039.eps
300508
Remarks
Normal: high(>2.2V)