CIRCUIT DESCRIPTIONS
D60WLCD - 923-03486
3-10
094A - SERVICING
SIGNAL BLOCK
AUDIO/VIDEO SWITCH (CXA2069Q)
The CXA2069Q is a 7-input, 3-output audio/video
switch featuring I2C bus compatibility for TVs. This IC
has input pins that are compatible with S2 protocol.
FEATURES
• 4 inputs that are compatible with S2 protocol
• Serial control with I2C bus
• 7 inputs, 3 outputs
• The desired inputs can be selected independently
for each of the 3 outputs
• Wide band video amplifier (20 MHz, –3 dB)
• Y/C MIX circuit
• Slave address can be changed (90H/92H)
• Audio muting from external pin
• High impedance maintained by I2C bus lines (SDA,
SCL) even when power is OFF
• Wide audio dynamic range (3 Vrms typ.)
DESCRIPTION OF OPERATION
The CXA2069Q is a TV I2C bus-compatible AV switch
IC. The video system and the stereo audio system have
7 inputs and 3 outputs each. Four of the seven video
system inputs support S2 and S protocols.
The desired inputs can be independently assigned to
each output (in the audio system, the left and right
channels are processed as one unit) by I2C bus control.
However, the same input is assigned to both the video
and audio system output 3.
VOUT1
YIN1
YOUT1
TRAP1
COUT1
CIN1
V/YOUT2
TRAP2
COUT2
VOUT3
YOUT3
LTV
LV1
LV2
LV3
LV4
LV5
Lv6
RTV
RV1
RV2
RV3
RV4
RV5
RV6
Y1
Y2
Y3
Y4
C1
C2
C3
C4
62
2
9
16
23
29
59
64
4
11
18
25
31
61
03
10
17
24
63
01
08
15
22
30
60
TV
V1
V2
V3
V4
V5
V6
05
12
19
26
COUTS
VGND
BIAS
Vcc
AGND
LOUT1
ROUT1
LOUT2
ROUT2
LOUT3
ROUT3
DC OUT
SCL
SDA
ADR
S-1
S-2
S-3
S-4
S2-1
S2-2
S2-3
S2-4
MUTE
57
50
42
35
52
54
36
33
34
32
07
14
21
28
06
13
20
27
48
37
43
45
38
40
49
56
55
58
51
44
46
47
41
39
The audio system is attenuated by 6dB at
input, and a total gain of 0dB (LOUT1
and ROUT1 can be changed to -6dB
6dB
6dB
6dB
6dB
6dB
6dB
6dB
6dB
BIAS
6dB
0dB
6dB
0dB
6dB
6dB
6dB
6dB
6dB
Logic
53
BLOCK DIAGRAM
VIDEO AND CHROMA SYNC PROCESSOR
DESCRIPTION
TA1270AF is a PAL/NTSC color TV signal processor IC
suitable for PIP/POP/PAP. The IC integrates video and
chroma sync processor circuits. It comes in a 48 pin
flat package.
The video block uses a chroma trap. The chroma block
uses PAL/NTSC automatic identifier circuits. The sync
processor block uses a 50/60Hz automatic identifier
circuit. The PAL demodulator circuit contains a
baseband signal processor, making the circuit
adjustment free. The TA1270AF incorporates an I2C bus,
enabling control to be set via the bus line.
FEATURES
1) Video block
• Chroma trap
• Y delay line
• Sub contrast adjustment(3dB)
2) CHROMA block
• IQ demodulation for NTSC: UV demodulation for PAL
• Tint control
• PAL demodulation baseband signal processing
• PAL/NTSC automatic identification
• Sub color adjustment(3dB)
Содержание D60WLCD Series
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Страница 69: ...D60WLCD 923 03486 5 3 094A EXPLODED VIEWS D60WLCD Main PCB Layout...
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Страница 71: ...D60WLCD 923 03486 5 5 094A EXPLODED VIEWS D60WLCD Digital PCB Layout...
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Страница 73: ...D60WLCD 923 03486 5 7 094A EXPLODED VIEWS D60WLCD Chroma PCB Layout...
Страница 74: ...D60WLCD 923 03486 5 8 094A EXPLODED VIEWS D60WLCD Tuner PCB Layout...
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