OPA350 Datasheet, PDF (19/40 Pages) Burr-Brown (TI) – High-Speed, Single-Supply, Rail-to-Rail OPERATIONAL AMPLIFIERS MicroAmplifier ™ Series

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Typical Applications (continued)
8.2.1.3 Application Curve
20
OPA350, OPA2350, OPA4350
SBOS099D – SEPTEMBER 2000 – REVISED DECEMBER 2015
0
-20
-40
-60
100
1k
10k
100k
1M
Frequency (Hz)
Figure 30. OPAx350 2nd Order 25-kHz, Chebyshev, Low-Pass Filter
8.2.2 Single-Supply Video Line Driver
Figure 31 shows a circuit for a single supply, G = 2 composite video line driver. The synchronized outputs of a
composite video line driver extend below ground. As shown, the input to the operational amplifier should be AC-
coupled and shifted positively to provide adequate signal swing to account for these negative signals in a single-
supply configuration.
The input is terminated with a 75-Ω resistor and AC-coupled with a 47-μF capacitor to a voltage divider that
provides the DC bias point to the input. In Figure 31, this point is approximately (V−) + 1.7 V. Setting the optimal
bias point requires some understanding of the nature of composite video signals. For best performance, avoid
the distortion caused by the transition region of the complementary input stage of the OPA350. See the
discussion of rail-to-rail input in Rail-to-Rail Input.
R_G
R_F
1kΩ
1kΩ
Video
In
C₁
220µF
C₂
47µF
R₁
75Ω
R₂
5kΩ
+5V
C₄
0.1µF
+
0.1µF 10µF
2
7
C₅
1000µF
6
OPA350
3
4
R₃
R₄
+5V (pin 7)
5kΩ
5kΩ
R_OUT
Cable
C₃
10µF
Figure 31. Single-Supply Video Line Driver
V_OUT
R_L
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