Datasheet

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SBOS233E − MARCH 2002− REVISED MAY 2009
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13
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.
DRIVING ANALOG-TO-DIGITAL
CONVERTERS
The OPA354 series op amps offer 60ns of settling time to
0.01%, making them a good choice for driving high- and
medium-speed sampling A/D converters and reference
circuits. The OPA354 series provide an effective means of
buffering the A/D converter’s input capacitance and
resulting charge injection while providing signal gain. For
applications requiring high DC accuracy, the OPA350
series is recommended.
Figure 6 illustrates the OPA354 driving an A/D converter.
With the OPA354 in an inverting configuration, a capacitor
across the feedback resistor can be used to filter
high-frequency noise in the signal.
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.
Figure 5. RGB Cable Driver