CXA2079Q
S2-Compatible 6-Input 2-Output Audio/Video Switch
Description
The CXA2079Q is a 6-input, 2-output audio/video
switch featuring I
2
C 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 I
2
C bus
•
6 inputs, 2 outputs
•
The desired inputs can be selected independently
for each of the 2 outputs
•
Wide band video amplifier (20MHz, –3dB)
•
Y/C MIX circuit
•
Slave address can be changed (90H/92H)
•
Audio muting from external pin
•
High impedance maintained by I
2
C bus lines (SDA,
SCL) even when power is OFF
•
Wide audio dynamic range (3Vrms typ.)
Applications
Audio/video switch featuring I
2
C bus compatibility
for TVs
Structure
Bipolar silicon monolithic IC
64 pin QFP (Plastic)
Absolute Maximum Ratings
•
Supply voltage
V
CC
•
Operating temperature Topr
•
Storage temperature
Tstg
•
Allowable power dissipation
P
D
Operating Conditions
Supply voltage
12
–20 to +75
–65 to +150
1300
V
°C
°C
mW
9 ± 0.5
V
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
–1–
E97430A7Y
CXA2079Q
Block Diagram
TV 63
V1
V2
1
8
6dB
6dB
53
VOUT1
49 YIN1
56 YOUT1
55 TRAP1
V3 15
V4 22
V5 60
6dB
Y1 3
Y2 10
Y3 17
Y4 24
6dB
6dB
58 COUT1
51 CIN1
41 VOUT2
45
YIN2
39 YOUT2
C1
5
6dB
C2 12
C3 19
C4 26
BIAS
37 COUT2
43 CIN2
57 VGND
50 BIAS
42 V
CC
35 AGND
LTV 62
LV1
2
6dB
0dB
44
AGND2
52 LOUT1
LV2 9
LV3 16
LV4 23
LV5 59
6dB
RTV 64
RV1
4
6dB
0dB
38 LOUT2
54 ROUT1
6dB
40 ROUT2
36 DC OUT
33 SCL
34 SDA
32 ADR
7
S-1
RV2 11
RV3 18
RV4 25
RV5 61
Logic
14 S-2
21 S-3
28 S-4
NC 29
NC 30
NC 31
NC 46
NC 47
6
S2-1
13 S2-2
20 S2-3
27 S2-4
48
MUTE
Audio system is attenuated by 6dB for 6kΩ resistor input, and a total gain is 0dB (LOUT1 and ROUT1 can be changed to –6dB).
–2–
CXA2079Q
Pin Configuration
AGND2
LOUT2
COUT2
DC OUT
ROUT2
VOUT2
YOUT2
MUTE
BIAS
YIN1
CIN2
AGND
CIN1
YIN2
SDA
51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
V
CC
NC
NC
SCL
32
LOUT1 52
VOUT1 53
ROUT1 54
TRAP1 55
YOUT1 56
VGND 57
COUT1 58
LV5 59
V5 60
RV5 61
LTV 62
TV 63
RTV 64
ADR
31 NC
30
29
NC
NC
28 S-4
27 S2-4
26 C4
25 RV4
24 Y4
23
LV4
22 V4
21 S-3
20
S2-3
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19
S2-2
S-1
V1
S2-1
RV2
RV1
RV3
C2
C1
LV2
LV1
LV3
Y2
Y1
S-2
V2
V3
Y3
–3–
C3
CXA2079Q
Pin Description
Pin
No.
Symbol
Pin
voltage
Equivalent circuit
Description
63
1
8
15
22
60
TV
V1
V2
V3
V4
V5
V
CC
63 15
150
3µA
4.0V
1
8
22
60
Video signal inputs.
Input composite video signals.
3
10
17
24
49
45
Y1
Y2
Y3
Y4
YIN1
YIN2
3
10
V
CC
150
3µA
4.0V
17
24
49
45
Y/C separation signal inputs.
Input luminance signals.
The YIN1 pin inputs the signal
obtained by Y/C separating the
VOUT1 pin output.
The YIN2 pin inputs the signal
obtained by Y/C separating the
VOUT2 pin output.
Y/C separation signal inputs.
Input chrominance signals.
The CIN1 pin inputs the signal
obtained by Y/C separating the
VOUT1 pin output.
The CIN2 pin inputs the signal
obtained by Y/C separating the
VOUT2 pin output.
5
12
19
26
51
43
C1
C2
C3
C4
CIN1
CIN2
5
12
V
CC
20k
150
27k
4.5V
19
26
51
43
62
2
9
16
23
59
64
4
11
18
25
61
LTV
LV1
LV2
LV3
LV4
LV5
RTV
RV1
RV2
RV3
RV4
RV5
62 64
2
4
V
CC
33k
27k
4.5V
9 11
16 18
23 25
59 61
15k
Audio signal inputs.
V
CC
250
V
CC
53
41
VOUT1
VOUT2
3.9V
53
41
30k
27k
23.5k
Video signal outputs.
Output composite video signals.
–4–
CXA2079Q
Pin
No.
Symbol
Pin
voltage
Equivalent circuit
V
CC
V
CC
V
CC
V
CC
Description
56
39
YOUT1
YOUT2
3.3V
56
39
Video signal outputs.
Output luminance signals.
V
CC
V
CC
V
CC
V
CC
58
37
COUT1
COUT2
4.5V
58
37
Video signal outputs.
Output chrominance signals.
V
CC
V
CC
56
20k
20k
52
38
54
40
LOUT1
LOUT2
ROUT1
ROUT2
52
4.5V
38
54
40
Audio signal outputs.
Zo = 50Ω (within DC ± 2mA)
V
CC
V
CC
6
13
20
27
S2-1
S2-2
S2-3
S2-4
6
V
CC
147
100k
—
13
20
27
Detects the S2-compatible DC
superimposed onto the C signal.
4:3 video signal at 1.3V or less
4:3 letter-box signal at 1.3V or more
to 2.5V or less
16:9 picture squeezed signal at 2.5V
or more
These pins are pulled down to GND
by a 100kΩ resistor, so the 4:3 video
signals are selected when open.
Composite video/S selector.
The detection results are written to
the status register.
S signal at 3.5V or less
Composite video signal at 3.5V or
more
These pins are pulled up to 5V by a
100kΩ resistor, so the composite
video signals are selected when
open.
Selects the slave address for the I
2
C
bus.
90H at 1.5V or less
92H at 2.5V or more
90H when open
5V
7
14
21
28
S-1
S-2
S-3
S-4
7
—
V
CC
100k
50k
V
CC
50k
V
CC
14
21
28
10k
V
CC
147
32
28k
72k
32
ADR
—
–5–
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