ISL59483_07 Datasheet, PDF (16/17 Pages) Intersil Corporation – Dual, 500MHz Triple, Multiplexing Amplifiers

ISL59483
4:1 RGB Dual Gain Video MUX
Connecting the MUX inputs and outputs in parallel allows the
8 channel ISL59483 to be used as a 4:1 RGB MUX with
selectable gains of 1 or 2 (Figure 10). In this example, the high
input impedance of the MUX enables each input video line to
be shared by any number of MUX input pins. The gain select
logic function is created by providing complememtary logic to
the HIZ1 and HIZ2 pins. Channels CH0 through CH3 are
selected by connecting the MUX 1 and MUX 2 S0-1, 2 and
S1-1, 2 channel select inputs together to form channel select
(S0 and S1), as shown in the truth table in Figure 10.
CH0 - CH3
CHANNELS B & C
NOT SHOWN
CHANNEL SELECT
AND GAIN SELECT
LOGIC INPUTS
CH0
CH1
CH2
CH3
S0
S1
GAIN
SELECT
ISL59483
1/3 MUX-AMP1
IN0A1
IN1A1
IN2A1
+1 ^OUTA1
IN3A1
S0-1
CONTROL
S1-1 LOGIC
HIZ1
IN0A2
IN1A2
IN2A2
IN3A2
1/3 MUX-AMP2
+2 ^OUTA2
S0-2
S1-2
HIZ2
CONTROL
LOGIC
* R_OUTA1
OUT
* R_OUTA2
CHANNEL SELECT TRUTH TABLE
DUAL GAIN 4:1 VIDEO MUX
GAIN
S1 S1 SELECT GAIN OUTA, B, C
0
0
0
1 CH0A, B, C
0
0
0
1 CH1A, B, C
1
1
0
1 CH2A, B, C
1
1
0
1 CH3A, B, C
0
0
1
2 CH0A, B, C
0
0
1
2 CH1A, B, C
1
1
1
2 CH2A, B, C
1
1
1
2 CH3A, B, C
* OPTIONAL - DEPENDING ON PARASITIC CAPACITANCE
FIGURE 45. APPLICATION CIRCUIT FOR DUAL GAIN 4:1 VIDEO MUX
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16
FN6394.2
May 21, 2007