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 ( CTA°=25 )
1CC
V Supply Voltage
2CC
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)
VCC2
AUDIO-IN, RCH(TV)
AUDIO-IN, LCH(TV)
AUDIO-IN, RCH(V3)
VIDEO-IN(V1)
MODE-IN(C1)
MODE-OUT, V3/HIGH
VIDEO-OUT
VCC
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
GL3812
GL3812
2
Block Diagram
BUFFER
BUFFER
BUFFER
VIDEO AMP
AUDIO
AMP(LCH)
AUDIO
AMP(RCH)
BUFFER
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 V12=
CC
V
PARAMETER SYMBOL CONDITIONS MIN
TYP
MAX
UNIT
Current Dissipation 2,1CC
I V12=V=V2CC1CC 10
15
20
mA
Video Channel Bandwidth V
F -3dB Frequency 5
10
—
MHz
Video Signal Voltage Gain V
A f=500 kHz, p.pIN V1V= 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
V1+V12=
1CC
V
Sine Wave (50Hz/60Hz) 15
20
—
DB
Video Channel Input Impedance IV
R 10
15
20
KΩ
Video Channel Output Impedance OV
R —
200
—
Ω
Video Channel Crosstalk V
CT f=3.58 MHz, p.p
V1=
IN
V 40
50
—
DB
Video Channel S/N V
SN p.p
V2=
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
V5.0=
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
V1+V12=
2CC
V
Sine Wave (50Hz/60Hz) 15
20
—
DB
Audio Channel Input Impedance ia
R 10
15
20
K
Ω
Audio Channel Output Impedance oa
R —
200
—
Ω
Audio Channel Crosstalk a
CT f=1 kHz 50
60
—
DB
Audio Channel S/N a
SN p.p
V2=
OUT
V 60
70
—
DB
Audio Signal THD a
THD f=1 kHz, p.p
V2=
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 3V,L
V TV or 1
V or 2
V
1 mode selection —
—
0.5
V
PIN 14 ( 3
V/H)
High Level Voltage 3V,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 1CC
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 2CC
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
10µF/50V
10µF/50V
10µF/50V
µF/50V
+
5V
50
50
1K
1K
10K
×3
50
+
µF/50V
1µF/50V
+
+
35K
AUDIO SIGNAL IN
LCH
75
75
1µF/50V
µF/50V
+
+
50
µF/50V
µF/50V
+
+
75
75
µF/50V
µF/50V
+
+
µF/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 VCC.
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
1ìF
+
1M
35K
1ìF
+
1M
35K
1ì
+
1M
35K
1ìF
+
1M
35K
1ìF
+
1M
35K
1ì
+
75
1ì
+
11
75
10ìF
+
+
75
+
75
1M
35K
1ìF
+
10ìF
1M
35K
1ìF
+
GL3812
