GL3812
1
GL3812
AUDIO/VIDEO
SWITCH FOR TV, VCR
Functions
Pin Configuration
Audio Signal Switching
Video Signal Switching
Input Signal Selecting Logic
Features
Possible to Switch 4 Channel Video Signals
Possible to Switch 4 Channel L & R Audio Signals
Absolute Maximum Ratings (
C
T
A
=
25
)
1
CC
V
Supply Voltage
2
CC
V
15V
Power Dissipation
D
P
310mW
Operating Temperature
OPR
T
-20 to
C
70
+
Storage Temperature
STG
T
-55 to
C
125
+
Mode Selection Logic/Output Signal
C1
C0
PIN 14
PIN15
PIN 16
PIN 17
PIN 18
L
L
L
L
VIDEO (TV)
AUDIO RCH(TV)
AUDIO LCH(TV)
L
H
L
H
VIDEO (
1
V
)
AUDIO RCH(
1
V
)
AUDIO LCH(
1
V
)
H
L
L
H
VIDEO (
2
V
)
AUDIO RCH(
2
V
)
AUDIO LCH(
2
V
)
H
H
H
H
VIDEO (
3
V
)
AUDIO RCH(
3
V
)
AUDIO LCH(
3
V
)
AUDIO-IN LCH(V1)
AUDIO-IN, LCH(V2)
AUDIO-IN, LCH(V3)
AUDIO-IN, RCH(V1)
AUDIO-IN, RCH(V2)
AUDIO-OUT LCH
VIDEO-IN(TV)
V
CC2
AUDIO-IN, RCH(TV)
AUDIO-IN, LCH(TV)
AUDIO-IN, RCH(V3)
VIDEO-IN(V1)
MODE-IN(C1)
MODE-OUT, V3/HIGH
VIDEO-OUT
V
CC
VIDEO-IN(V2)
GND
MODE-IN(C0)
AUDIO-OUT RCH
MODE-OUT TV/LOW
VIDEO-IN(V3)
1
2
3
4
5
6
7
10
9
8
11
22
21
20
19
18
17
16
13
14
15
12
G L 3 8 1 2
GL3812
2
Block Diagram
BUFFER
BUFFER
BUFFER
VIDEO AMP
AUDIO
AMP(LCH)
AUDIO
AMP(RCH)
BUF
FER
BUFFER
BUFFER
DECODER
MODE-IN
INTERFACE
16
11
13
18
17
1
10
20
8
15
14
7
8
12
19
1
3
2
22
4
5
6
21
VIDEO OUT
MOD
E
-
IN(CO)
MODE
-
IN(C1)
-
OUT, LCH
AUDIO
-
OUT, RCH
VIDEO
-
IN, V
1
VIDEO
-
IN, V
2
VIDEO
-
IN, V
3
VIDEO
-
IN, TV
AUDIO
-
IN, V
1
AUDIO
-
IN, V
2
AUDIO
-
IN, V
3
AUDIO
-
IN, TV
AUDIO
-
IN, V
1
AUDIO
-
IN, V
2
AUDIO
-
IN, V
3
AUDIO
-
IN, TV
LCH
RCH
GND
GL3812
3
Electrical Characteristics:
,
C
25
=
A
T
V
12
=
CC
V
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNIT
Current Dissipation
2
,
1
CC
I
V
12
=
V
=
V
2
CC
1
CC
10
15
20
mA
Video Channel Bandwidth
V
F
-3dB Frequency
5
10
--
MHz
Video Signal Voltage Gain
V
A
f=500 kHz,
p
.
p
IN
V
1
V
=
5.0
6.0
7.0
dB
Video Signal
Input Dynamic Range
V
D
f=500 kHz,
THD < 1 %
1.7
2.0
--
p
.
p
V
Video Channel PSRR
V
PS
p
.
p
V
1
+
V
12
=
1
CC
V
Sine Wave (50Hz/60Hz)
15
20
--
DB
Video Channel Input Impedance
IV
R
10
15
20 K
Video Channel Output Impedance
OV
R
--
200
--
Video Channel Crosstalk
V
CT
f=3.58 MHz,
p
.
p
V
1
=
IN
V
40
50
--
DB
Video Channel S/N
V
SN
p
.
p
V
2
=
out
V
50
60
--
DB
Audio Channel Bandwidth
A
F
-3dB frequency
100
--
-
--
KHz
Audio Signal Voltage Gain
a
A
f=1 kHz,
p
.
p
V
5
.
0
=
IN
V
10
12
14
DB
Audio Signal
Input Dynamic Range
a
D
f=1 kHz
THD < 1 %
0.7
1.0
--
p
.
p
V
Audio Channel PSRR
a
PS
p
.
p
V
1
+
V
12
=
2
CC
V
Sine Wave (50Hz/60Hz)
15
20
--
DB
Audio Channel Input Impedance
ia
R
10
15
20 K
Audio Channel Output Impedance
oa
R
--
200
--
Audio Channel Crosstalk
a
CT
f=1 kHz
50
60
--
DB
Audio Channel S/N
a
SN
p
.
p
V
2
=
OUT
V
60
70
--
DB
Audio Signal THD
a
THD
f=1 kHz,
p
.
p
V
2
=
OUT
V
--
0.5
1.5
%
Input Mode Selection
Threshold Voltage
MTH
V
2.0
2.3
2.6
V
PIN 14 (
3
V
/H)
Low Level Voltage
3
V
,
L
V
TV or 1
V or
2
V
1 mode selection
--
--
0.5
V
PIN 14 (
3
V
/H)
High Level Voltage
3
V
,
H
V
3
V mode selection
10
--
--
V
PIN 15 (TV/L)
Low Level Voltage
TV
,
L
V
TV mode selection
--
--
0.5
V
PIN 15 (TV/L)
High Level Voltage
TV
,
H
V
1
V or
2
V or
3
V
1 mode selection
10
--
--
V
GL3812
4
Pin Description
No.
Name
Explanation
No.
Name
Explanation
1 AUDIO-IN (
1
L
)
Input of L-Ch Audio Signal
for Video (
1
V
).
13 MODE-IN (C1)
Input for Mode
Selection
2 AUDIO-IN (
2
L
)
Input of L-Ch Audio Signal
for Video (
2
V
).
14 MODE-OUT (
3
V
/H)
Output Voltage of this Pin
Becomes High State,
Only when
3
V
is Selected
Else Low State
3 AUDIO-IN (
3
L
)
Input of L-Ch Audio Signal
for Video (
3
V
).
4 AUDIO-IN (
1
R
)
Input of R-Ch Audio Signal
for Video (
1
V
).
15 MODE-OUT (TV/L)
Output Voltage of this Pin
Becomes Low State, Only
when TV is selected.
Else High State.
5 AUDIO-IN (
2
R
)
Input of R-Ch Audio Signal
for Video (
2
V
).
16 VIDEO-OUT
Output of Selected Video
Signal
6 AUDIO-IN (
3
R
)
Input of R-Ch Audio Signal
for Video (
3
V
).
17 AUDIO-OUT(R)
Output of Selected R-CH
Audio Signal
7 VIDEO-IN (
1
V
)
Input of V Video Signal.
18 AUDIO-OUT (L)
Output of Selected L-CH
Audio Signal
8
1
CC
V
Power Supply for Video
and Logic Block.
19 VIDEO-IN (TV)
Input of TV Video Signal
9 VIDEO-IN (
2
V
)
Input of video Signal.
20
2
CC
V
Power Supply for Audio
Block
10 GND
21 AUDIO-IN (R-TV)
Input of R-CH Audio
Signal for Video (TV).
11 MODE-IN (C0)
Input for Mode Selection.
12 VIDEO-IN (
3
V
)
Input of V Video Signal.
22 AUDIO-IN (L-TV)
Input of L-CH Audio
Signal for Video (TV).
GL3812
5
Test Circuit
2
10
F/50V
10
F/50V
10
F/50V
F/50V
+
5V
50
50
1K
1K
10K
3
5
0
+
F/50V
1
F/50V
+
+
35K
AUDIO SIGNAL IN
LCH
75
75
1
F/50V
F/50V
+
+
50
F/50V
F/50V
+
+
75
75
F/50V
F/50V
+
+
F/50V
1
2
5
7
8
9
11
12
13
14
15
16
17
18
19
20
21
22
10
GL3812
35K
GL3812
6
Application Circuit
* In case of not using Pin 14 or 15, Connect to Ground.
In case of not using Pin 11, Connect to V
CC
.
In case of not using Pin 13, Connect to Ground.
1
10
9
8
7
6
5
4
3
22
21
13
14
15
16
17
18
19
20
12
2
1M
35K 1F
+
1M
35K 1F
+
1M
35K 1
+
1M
35K 1F
+
1M
35K 1F
+
1M
35K 1
+
75
1
+
11
75
10F
+
+
75
+
75
1M
35K
1F
+
10F
1M
35K
1F
+
GL3812
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