akira LCT-17CHST, Service Manual

Page: 14 / 37

-
14
-
Model No.: LCT17CHST.doc
Version: 1.0
2. TDA15021H
:
The third-generator super integrated circuit UOC III which designed by Philips company
recently integrates with video decode
、
2D comb filter
、
high quality audio transacting technique,
suitable with the European teletext technique and suitable with US closed caption and V-chip
function compatible with single series IC. The series of UOC III have high integrity, besides
completing the Processing of all small signal (IF signal demodulation, video decode, H/V
signal, sound DSP), and integrate all the MCU function. It has many Advantages, example: the
compact circuit
、
good performance
、
simple craft, etc. it matches with company’s high
performance price ratio and high product efficiency demanding. It is suitable for 4:3 or 16:9
、
50/60HZ and A100/120HZ TV system, the main characteristic below:
z Multi-system IF demodulation 、 analog video decode
z Comb filter internal
z NICAM
、
stereo auto identify and decode
z SCART input channel source auto identify(RGB 、 CVBS),SCART image input format
identify(4:3
、
16
：
9)
z Support 4:3 、 16:9 display format
z TOP/FLOF TELETEXT
（
10 page
）
receive display
z Channel auto install ACI function （ can preset ）
z 4 CVBS or 3 Y/C input,1 CVBS output,2 YcrCb/2 RGB input
z 4 AV audio input,1 AV adjustable audio volume output
z Volume auto level control circuit
z
Global FM demodulation
z Picture quality enhancement of dynamic peak value control
、
skin color correct
、
Gamma
correct
、
Black level extension etc.
z Can turn down horizon and vertical scan part
，
output H/V sync. signal to Scalar
z 128K Flash Memory inside, support program on line
z Automatic Y/C signal identify
TDA15021H Pin Function:
Pin Definition Pin Function
1 VSSP2 Grounding
2 VSSC4 Grounding
3 VDDC4 +1.8V
4 VDDA3 +3.3V
5 VREF_POS_LSL +3.3V
6 VREF_HPL 0V
7 VREF_HPR +3.3V
8 VREF_HPR 0V
9 VREF_POS_HPR
+3.3V
10 XTALIN Crystal oscillator input
11 XTALOUT Crystal oscillator output
12 VSSA1 Grounding
13 VGUARD/SWIO Protecting voltage input or I/O
14 DECDIG DECDIG signal input
15 VP1 +5V
16 PH2LF The second grade horizontal phase lock filter
17 PH1LF The first grade horizontal phase lock filter
18 GND1 Grounding
19 SECPLL SECAM PLL decouple
20 DECBG Inside reference voltage decouple
21 EWD/AVL VDD5A voltage input
22 VDRB TV vertical sync signal output