GL3820
1
GL3820
Description
This integrated circuit provides all video
switching allowing connections between the peri
TV plug and video sections in the TV set.
Pin configuration
Features
1 Video Output 75 1 V
PP
No Switched
1 Switched Video Output 2 V
PP
Video Cross Talk : 50 dB Typical
Short Circuit Protection of Inputs and Outputs
Clamped Video Inputs
Maximum Ratings
RATING
SYMBOL
VALUE
UNIT
Supply Voltage
V
cc
18
V
Operating Temperature
with Load > 150
with Load = 75
T
opr
-10 to + 100
-10 to + 70
Junction Temperature
T
j
-40 to + 150
Storage Temperature
T
stg
-40 to + 150
Minimum DC Load Resistor P
6
Minimum DC Load Resistor P
2
600
75
Typical Application and Test Circuit
Note : We advice to protect the 75
output through a 75
resistor for supply voltage upper than 9 V.
1
2
3
4
5
6
7
8
GL6850
GND
75
VIDEO OUTPUT
INTERNAL
VIDEO INPUT
NC
EXTERNAL
V
CC
SWITCHED
VIDEO OUTPUT
SWITCHING
INPUT
V
CC
External
Video
Input
1 V
PP
Video
Coming
from
TV
2 V
PP
Video 1 V
PP
75
75
Video
2 V
PP
600
Switching Input
. 0 or no connected = Video TV
. > 7V = external video
10k
Ref.
(low
impedance)
8
3
7
6
2
1
5
G = 2
G = 1
2mA
GL3820
2
Electrical Characteristics : Ta = + 25
, VCC = 9V (unless otherwise noted)
CHARACTERISTIC
SYMBO
L
MIN TYP MAX UNIT
Supply Voltage Range
V
CC
8
-
14
V
Supply Current (no load on pin 2 and pin 6)
I
CC
-
-
20
mA
Supply Current (with 75
between pin 2-1, with 600
between pin 6-1)
I
CC
-
40
-
mA
Total Power Dissipation with Load
P
tot
-
450
-
mW
Internal Video Input Swing from PIF (positive video)
-
-
-
4.5 V
PP
Internal Video Input Impedance (positive video)
-
50
-
-
k
External Video input Swing (positive video)
-
-
-
2
V
PP
External Video Input Impedance (positive video)
-
50
-
-
k
Switched Video Output Swing
-
-
-
4.5 V
PP
Switched Video Output Dynamic Impedance
-
-
10
Switched Video DC Output Voltage (sync. Pulse level, note) (600
)
-
105 1.8
2.2
V
Switched Video Band Width (- 1 dB)
-
6
-
-
MHz
Switched Video Output Gain
Pin 6 Pin 8 (gain with 600
load)
Pin 6 Pin 3 (gain with 600
load)
-
+ 5
- 1
+6
-0.5
+7
0
DB
External Video Output swing( with 150
load)
-
-
2
2.2
V
External Video Dynamic Output Impedance
-
-
10
-
External Video DC Output Voltage (sync. Pulse level, note) (150
)
-
1.5
1.8
2.2
V
External Video Output Gain (pin 2 pin3 gain with 150
load)
-
-1.8
-1
-0.4 dB
Switching Input Unactive Low Level or Unconnected Pin (TV receiving)
-
0
-
3
V
Switching Input Active Level (ext. receiving)
-
7
-
V
CC
V
Switching Input Impedance
-
10
-
-
k
Video Rejection between Two Inputs
0 to 5 MHz
1kHz
-
-
-
-50
-50
-
-
-
dB
Differential Group Delay
-
-
15
-
ns
Linearity Distortion
Luma
Chroma
Intermodulation Luma - Chroma
-
-
-
2
2
5
-
-
-
%
Supply Voltage Rejection (1 kHz)
-
40
50
-
dB
Note : Use a video signal with a synchro pulse in order to make the clamp work in a correct way (75
to
the ground and 10 F in series).
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