Datasheet

Video
In
Video
Output
+2.5V
+5V
+2.5V
604
Ω
75
Ω
604
Ω
75
Ω
OPA354
1/2
OPA2354
604
Ω
1
µ
F
R
2
10nF
604
Ω
+3V
R
1
V+
75
Ω
Red
Green
Blue
604
Ω
Red
(1)
R
2
R
1
V+
Green
(1)
R
2
R
1
V+
Blue
(1)
75
Ω
OPA354
1
µ
F 10nF
+3V
75
Ω
75
Ω
1/2
OPA2354
604
Ω
75
Ω
604
Ω
604
Ω
75
Ω
+
+
NOTE: (1) Source video signal offset
300mV above ground to accomodate
op amp swing−to−ground capability.
OPA354-Q1
OPA2354-Q1
SBOS492A –JUNE 2009–REVISED AUGUST 2009 ....................................................................................................................................................... www.ti.com
Video
The OPA354 output stage is capable of driving standard back-terminated 75-Ω video cables (see Figure 4). By
back-terminating a transmission line, it does not exhibit a capacitive load to its driver. A properly back-terminated
75-Ω cable does not appear as capacitance; it presents only a 150-Ω resistive load to the OPA354 output.
Figure 4. Single-Supply Video Line Driver
The OPA354 can be used as an amplifier for RGB graphic signals, which have a voltage of zero at the video
black level, by offsetting and ac-coupling the signal (see Figure 5).
Figure 5. RGB Cable Driver
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