GL3812
GL3812
AUDIO/VIDEO
SWITCH FOR TV, VCR
Functions Pin Configuration
• Audio Signal Switching
• Video Signal Switching
• Input Signal Selecting Logic
AUDIO-IN LCH(V1) 1 22 AUDIO-IN, LCH(TV)
Features AUDIO-IN, LCH(V2) 2 21 AUDIO-IN, RCH(TV)
• Possible to Switch 4 Channel Video Signals AUDIO-IN, LCH(V3) 3 20 VCC2
• Possible to Switch 4 Channel L & R Audio Signals AUDIO-IN, RCH(V1) 4 19 VIDEO-IN(TV)
18 AUDIO-OUT LCH
= 25°C )
AUDIO-IN, RCH(V2) 5
Absolute Maximum Ratings ( T A
AUDIO-IN, RCH(V3) 6 17
GL3812 AUDIO-OUT RCH
Supply Voltage VCC1 VIDEO-IN(V1) 7 16 VIDEO-OUT
15V
VCC 2 VCC 8 15 MODE-OUT TV/LOW
Power Dissipation PD 310mW VIDEO-IN(V2) 9 14 MODE-OUT, V3/HIGH
Operating Temperature TOPR -20 to +70°C GND 10 13 MODE-IN(C1)
Storage Temperature TSTG -55 to +125°C MODE-IN(C0) 11 12 VIDEO-IN(V3)
Mode Selection Logic/Output Signal
C1 C0 PIN 14 PIN15 PIN16 PIN17 PIN18
L L L L VIDEO(TV) AUDIO RCH(TV) AUDIO LCH(TV)
L H L H VIDEO ( V1 ) AUDIO RCH( V1 ) AUDIO LCH( V1 )
H L L H VIDEO ( V2 ) AUDIO RCH( V2 ) AUDIO LCH( V2 )
H H H H VIDEO( V3 ) AUDIO RCH( V3 ) AUDIO LCH( V3 )
1
Block Diagram
14 15 8 20
VIDEO-IN, V1 7
VIDEO-IN, V2 8
BUFFER VIDEO AMP BUFFER 16 VIDEO OUT
VIDEO-IN, V3 12
VIDEO-IN, TV 19
11 MODE-IN(CO)
MODE-IN
AUDIO-IN, V1 1
INTERFACE
DECODER
2 1 13 MODE-IN(C1)
2
AUDIO-IN, V2
LCH BUFFER
AUDIO-IN, V3 3
AUDIO-IN, TV 22
AUDIO
BUFFER 18 -OUT, LCH
AMP(LCH)
AUDIO-IN, V1 4
AUDIO-IN, V2 5 AUDIO
RCH BUFFER BUFFER 17 AUDIO-OUT, RCH
6 AMP(RCH)
AUDIO-IN, V3
AUDIO-IN, TV 21
10
GND
GL3812
GL3812
Electrical Characteristics: TA = 25°C, VCC = 12 V
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNIT
Current Dissipation ICC1,2 VCC1 = VCC2 = 12V 10 15 20 mA
Video Channel Bandwidth FV -3dB Frequency 5 10 — MHz
Video Signal Voltage Gain AV f=500 kHz, VIN = 1Vp.p 5.0 6.0 7.0 dB
Video Signal f=500 kHz,
DV 1.7 2.0 — Vp.p
Input Dynamic Range THD < 1 %
VCC1 = 12V + 1Vp.p
Video Channel PSRR PS V 15 20 — DB
Sine Wave (50Hz/60Hz)
Video Channel Input Impedance R IV 10 15 20 KΩ
Video Channel Output Impedance R OV — 200 — Ω
Video Channel Crosstalk CTV f=3.58 MHz, VIN = 1Vp.p 40 50 — DB
Video Channel S/N SN V Vout = 2Vp.p 50 60 — DB
Audio Channel Bandwidth FA -3dB frequency 100 —
- — KHz
Audio Signal Voltage Gain Aa f=1 kHz, VIN = 0.5Vp.p 10 12 14 DB
Audio Signal f=1 kHz
Da 0.7 1.0 — Vp.p
Input Dynamic Range THD < 1 %
VCC2 = 12 V + 1Vp.p
Audio Channel PSRR PS a 15 20 — DB
Sine Wave (50Hz/60Hz)
Audio Channel Input Impedance R ia 10 15 20 KΩ
Audio Channel Output Impedance R oa — 200 — Ω
Audio Channel Crosstalk CTa f=1 kHz 50 60 — DB
Audio Channel S/N SN a VOUT = 2Vp.p 60 70 — DB
Audio Signal THD THD a f=1 kHz, VOUT = 2Vp.p — 0.5 1.5 %
Input Mode Selection
VMTH 2.0 2.3 2.6 V
Threshold Voltage
PIN 14 ( V3 /H) TV or V1 or V2
VL, V3 — — 0.5 V
Low Level Voltage 1 mode selection
PIN 14 ( V3 /H)
VH , V 3 V3 mode selection 10 — — V
High Level Voltage
PIN 15 (TV/L)
VL, TV TV mode selection — — 0.5 V
Low Level Voltage
PIN 15 (TV/L) V1 or V2 or V3
VH ,TV 10 — — V
High Level Voltage 1 mode selection
3
GL3812
Pin Description
No. Name Explanation No. Name Explanation
1 AUDIO-IN ( L1 ) Input of L-Ch Audio Signal 13 MODE-IN (C1) Input for Mode
for Video ( V1 ). Selection
2 AUDIO-IN ( L 2 ) Input of L-Ch Audio Signal 14 MODE-OUT ( V3 /H) Output Voltage of this Pin
for Video ( V2 ). Becomes High State,
3 AUDIO-IN ( L 3 ) Input of L-Ch Audio Signal Only when V3 is Selected
for Video ( V3 ). Else Low State
15 MODE-OUT (TV/L) Output Voltage of this Pin
Becomes Low State, Only
4 AUDIO-IN ( R 1 ) Input of R-Ch Audio Signal when TV is selected.
for Video ( V1 ). Else High State.
5 AUDIO-IN ( R 2 ) Input of R-Ch Audio Signal 16 VIDEO-OUT Output of Selected Video
for Video ( V2 ). Signal
6 AUDIO-IN ( R 3 ) Input of R-Ch Audio Signal 17 AUDIO-OUT(R) Output of Selected R-CH
for Video ( V3 ). Audio Signal
7 VIDEO-IN ( V1 ) Input of V Video Signal. 18 AUDIO-OUT (L) Output of Selected L-CH
Audio Signal
8 VCC1 Power Supply for Video 19 VIDEO-IN (TV) Input of TV Video Signal
and Logic Block.
9 VIDEO-IN ( V2 ) Input of video Signal. 20 VCC 2 Power Supply for Audio
Block
10 GND 21 AUDIO-IN (R-TV) Input of R-CH Audio
11 MODE-IN (C0) Input for Mode Selection. Signal for Video (TV).
22 AUDIO-IN (L-TV) Input of L-CH Audio
Signal for Video (TV).
12 VIDEO-IN ( V3 ) Input of V Video Signal.
4
Test Circuit
+ 5V
µF/50V
+
µF/50V ×2
10K×3
+ 1K
75 µF/50V
1K
+
µF/50V µF/50V
75
22 21 20 19 18 17 16 15 14 13 12
10µF/50V
GL3812
10µF/50V 50
+
1 2 5 7 8 9 10 11
5
10µF/50V
50 50
+
1µF/50V
+ +
µF/50V
50
µF/50V
AUDIO SIGNAL IN
LCH +
35K 75 1µF/50V
+
µF/50V
35K 75
GL3812
GL3812
Application Circuit
35K 1ìF 1ìF 35K
1M + + 1M
1 22
35K 1ìF 1ìF 35K
1M + + 1M
2 21
1M 35K 1ì
+
3 20
35K 1ìF 10ìF 75
1M + +
4 19
1M 35K 1ìF
+
5 18
1M 35K 1ì
+
6 GL3812 17
75 1ì
+
7 16
8 15
75 10ìF
+ 9 14
10 13
75
+
11 12
* 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.
