KA2192

4 INPUT A/V SWITCH

OPERATING PRINCIPLE

ÀIn-output truth table of A/V switching IC for input switch conditions.

ÁSound mute switch

ÂGain switch

ÃTV polarity switch

SW INPUT

DECODER OUT

WOUND OUT

VIDEO OUT

Y & C OUT

CODE OUT

SW1

SW2

A

B

C

D

L-OUT

R-OUT

V-OUT

Y OUT

C OUT

MODE OUT

L

L

H

L

L

L

EXT2

EXT2

EXT2

-

-

2(V)

H

L

L

H

L

L

EXT1

EXT1

EXT1

-

-

2(V)

H

H

L

L

H

L

TV

TV

TV

-

-

0(V)

L

H

L

L

L

H

SUPER

SUPER

SUPER

S-Y

S-C

4(V)

L:0(V)

H:5(V)

L:0.8(V)

H:2.1(V)

SOUND MUTE S/W

=HIGH[5]

:SOUND OFF

TV

POLARITY

SW=H

GAIN SW

=H: 8dB

IF SW1(L)

SW2(H)

S-Y &S-C

OUT

FROM

EXT1,2:

2[V]

TV:0[V]

S-VHS:

4[V]

MUTEIN

SOUND-OUT

L-OUT

R-OUT

H [5V]

OFF

OFF

L [0V]

ON

ON

GAIN

SWITCH

H [5V]

8dB

L [0V]

6dB

TV

POLARITY

SWITCH

H [V

A

L [GND]

A

6dB OR 8 dB

A

V