ISL59481_07 Datasheet, PDF (11/12 Pages) Intersil Corporation – Dual, 500MHz Triple, Multiplexing Amplifiers

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.
+
CH0 _-
CH0A THROUGH CH3A
CHANNELS B AND C
NOT SHOWN
+
CH1 _-
CH2 ⁺
-
CHANNEL SELECT
LOGIC INPUTS
+
CH1 _-
S0
S1
HIZ
ISL59481
1/3 MUX-AMP1
IN0A1
IN1A1
IN2A1
+1 ^OUTA1
IN3A1
S0-1
S1-1
CONTROL
LOGIC
HIZ1
IN0A2
IN1A2
IN2A2
IN3A2
1/3 MUX-AMP2
+1 ^OUTA2
S0-2
S1-2
HIZ2
CONTROL
LOGIC
+
OUTA
-
CHANNEL SELECT TRUTH TABLE
4:1 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
FIGURE 18. APPLICATION CIRCUIT FOR 4:1 RGB DIFFERENTIAL VIDEO MUX
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11
FN6208.4
May 18, 2007