ISL59482_14 Datasheet, PDF (13/15 Pages) Intersil Corporation – Dual, 500MHz Triple, Multiplexing Amplifiers

ISL59482
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.
CH0A - CH7A
CHANNELS B and C
NOT SHOWN
CHANNEL SELECT
LOGIC INPUTS
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
S0
S1
S2
IN0A1
IN1A1
IN2A1
IN3A1
ISL59482
1/3 MUX-Amp1
+2 ^OUTA1
S0-1
S1-1
HIZ1
IN0A2
IN1A2
IN2A2
IN3A2
CONTROL
LOGIC
1/3 MUX-Amp2
+2 ^OUTA2
S0-2
S1-2
HIZ2
CONTROL
LOGIC
OUTA
CHANNEL SELECT TRUTH TABLE
8:1 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
FIGURE 29. APPLICATION CIRCUIT FOR 8:1 RGB VIDEO MUX
CH0
+
-
CH0A - CH3A
Channels B & C
Not Shown
Channel Select
Logic Inputs
CH1
+
-
CH2 ⁺
-
CH3
+
-
S0
S1
HIZ
IN0A1
IN1A1
IN2A1
IN3A1
ISL59482
1/3 MUX-Amp1
+2 ^OUTA1
S0-1
S1-1
HIZ1
IN0A2
IN1A2
IN2A2
IN3A2
Control
Logic
1/3 MUX-Amp2
+2 ^OUTA2
S0-2
S1-2
HIZ2
Control
Logic
CHANNEL SELECT TRUTH TABLE
4:1 DIFFERENTIAL VIDEO MUX
+
OUTA
-
S1
S0
0
0
0
1
1
0
1
1
OUTA, B, C
CH0A, B, C
CH1A, B, C
CH2A, B, C
CH3A, B, C
FIGURE 30. APPLICATION CIRCUIT FOR 4:1 RGB DIFFERENTIAL VIDEO MUX
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FN6209.4
August 8, 2014