Daewoo DSC-3220E/3220L - Manual (Page 42)

Service manual SC-150
-41-
4-10 MM1118
4-10-1 General description
This is a 3-input, 1-output video switch IC with a clamp function and built-in 6dB amp, for video signal switching.
One of the inputs also has a mute function.
4-10-2 Features
-Built-in 6dB amp
-Clamp function
-Mute function
-Current consumption: 5.1mA typ.
-Operating power supply voltage range: 4.6~13.0V
-Frequency response: 10MHz
-Crosstalk: 64dB (at 4.43MHz)
4-10-3 Block diagram
4-10-4 Pin Description
1 2 3 4 5 6 7 8
IN3 Vcc OUT GND IN1 SW1 IN2 SW2
SW1
Control input trurh table
L
H
L
L
H
IN1
IN2
IN3
"
SW2 OUT
Clamp Clamp
Clamp
SW
SW
Buffer
Bias
Pin Symbol Description
Input1 5 IN1
7 IN2 Input2
1 IN3 Input3
6 SW1 Switch1
8 SW2 Switch2
2 Vcc Power supply
3 OUT Output
Ground 4 GND