ISL59482

FN6209 Rev 4.00

Page 13 of 15

Aug 8, 2014

4:1 RGB Differential Video MUX

Connecting the channel select pins in parallel (S0-1 to S0-2 and

S1-1 to S1-2) converts the 8 individual RGB video inputs into 4

differential RGB input pairs. The amplifier RGB outputs are

similarly paired resulting in a fully differential 4:1 RGB MUX amp

shown in Figure 30. Connecting HIZ1 and HIZ2 to +5V disables the

4:1 differential MUX, and enables the connection of additional

differential connected MUX amplifiers to the same outputs, thus

allowing input expansion to 8:1 or more.

FIGURE 29. APPLICATION CIRCUIT FOR 8:1 RGB VIDEO MUX

S2

S1

S0

OUTA, B, C

0

0

0

CH0A, B, C

0

0

1

CH1A, B, C

0

1

0

CH2A, B, C

0

1

1

CH3A, B, C

1

0

0

CH4A, B, C

1

0

1

CH5A, B, C

1

1

0

CH6A, B, C

1

1

1

CH7A, B, C

+2

+2

ISL59482

1/3 MUX-Amp1

1/3 MUX-Amp2

OUTA1

IN0A1

OUTA2

IN1A2

IN1A1

IN2A1

IN3A1

IN0A2

IN2A2

IN3A2

S0-1

S1-1

HIZ1

S0-2

S1-2

HIZ2

CH0

CH1

CH2

CH3

CH4

CH5

CH6

CH7

S0

S1

S2

CH0A - CH7A

CHANNEL SELECT

CHANNELS B and C

NOT SHOWN

LOGIC INPUTS

CHANNEL SELECT TRUTH TABLE

8:1 VIDEO MUX

CONTROL

LOGIC

CONTROL

LOGIC

OUTA

FIGURE 30. APPLICATION CIRCUIT FOR 4:1 RGB DIFFERENTIAL VIDEO MUX

S1

S0

OUTA, B, C

00

CH0A, B, C

01

CH1A, B, C

10

CH2A, B, C

11

CH3A, B, C

+2

+2

ISL59482

1/3 MUX-Amp1

1/3 MUX-Amp2

OUTA

OUTA1

IN0A1

OUTA2

IN1A2

IN1A1

IN2A1

IN3A1

IN0A2

IN2A2

IN3A2

S0-1

S1-1

HIZ1

S0-2

S1-2

HIZ2

CH0A - CH3A

Channel Select

Channels B & C

Not Shown

Logic Inputs

+

-

S0

S1

HIZ

CH0

CH1

CH2

CH3

+

-

+

-

+

-

+

-

CHANNEL SELECT TRUTH TABLE

4:1 DIFFERENTIAL VIDEO MUX

Control

Logic

Control

Logic