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FN6208.3

December 22, 2006

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 18. 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 18. APPLICATION CIRCUIT FOR 4:1 RGB DIFFERENTIAL VIDEO MUX

S1

S0

OUTA, B, C

0

0

CH0A, B, C

0

1

CH1A, B, C

1

0

CH2A, B, C

1

1

CH3A, B, C

+1

+1

ISL59481

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

CH1

+

-

+

-

+

-

+

-

CHANNEL SELECT TRUTH TABLE

4:1 DIFFERENTIAL VIDEO MUX

CONTROL

LOGIC

CONTROL

LOGIC

ISL59481