APPLICATIONS INFORMATION
750Ω
n...
75Ω
OFF
750Ω
750Ω
750Ω
OFF
750Ω
ON
750Ω
75Ω
⇒ 75Ω
1575 R2
n – 1 75Ω
R1
75Ω CABLE
n = NUMBER OF LT1675s
IN PARALLEL
75Ω
1675 F05
Figure 5. Off Channels Load the Cable Termination
with 1575Ω Each
LT1675/LT1675-1
R1
AV = 2
75Ω
R2
LT1675 #1
ENABLE
R3
AV = +2
75Ω
RED
OUT
75Ω
R4
LT1675 #2
ENABLE
CHIP
SELECT
74HC04
1675 F06
Figure 6. Two LT1675s Build a 4-Input RGB Router
1V
RED 1
INPUT
0V
1V
RED
OUTPUT
0V
500mV/DIV
500mV/DIV
CHIP SELECT = 0V, IC #2 DISABLED
1675 F07
Figure 7. 4-Input Router Response
CHIP 5V
SELECT
0V
RED 0V
OUTPUT
5V/DIV
1V/DIV
RED 1 INPUT = 0V
RED 3 INPUT = UNCORRELATED SINEWAVE
1675 F08
Figure 8. 4-Input Router Toggling
16751fb
11