THS3095_14 Datasheet, PDF (18/37 Pages) Texas Instruments – HIGH-VOLTAGE, LOW-DISTORTION, CURRENT-FEEDBACK OPERATIONAL AMPLIFIERS

THS3091
THS3095
SLOS423G – SEPTEMBER 2003 – REVISED OCTOBER 2008........................................................................................................................................ www.ti.com
WIDEBAND, INVERTING OPERATION
Figure 60 shows the THS3091 in a typical inverting
gain configuration where the input and output
impedances and signal gain from Figure 59 are
retained in an inverting circuit configuration.
15 V _+VS
50-Ω Source _RG
V_I
499 Ω
R_M
56.2 Ω
0.1 µF
+
6.8 µF
+
T_{_}HS3091
49.9 Ω
50-Ω LOAD
R_F
1 kΩ
0.1 µF 6.8 µF
+
−15 V ^−VS
Figure 60. Wideband, Inverting Gain
Configuration
SINGLE-SUPPLY OPERATION
The THS3091/5 have the capability to operate from a
single-supply voltage ranging from 10 V to 30 V.
When operating from a single power supply, biasing
the input and output at mid-supply allows for the
maximum output voltage swing. The circuits shown in
Figure 61 show inverting and noninverting amplifiers
configured for single-supply operations.
+V_S
50-Ω Source
V_I
R_T ^{49.9 Ω}
+
THS3091
_
+V_S
2
R_F
R_G
1.21 kΩ
1.21 kΩ
49.9 Ω
50-Ω LOAD
+V_S
2
50-Ω Source
R_G
V_I
499 Ω
56.2 Ω R_T
+V_S +V_S
2
2
R_F
1 kΩ
V_S
_
THS3091
+
49.9 Ω
50-Ω LOAD
Figure 61. DC-Coupled, Single-Supply Operation
Video Distribution
The wide bandwidth, high slew rate, and high output
drive current of the THS3091/5 matches the demands
for video distribution for delivering video signals down
multiple cables. To ensure high signal quality with
minimal degradation of performance, a 0.1-dB gain
flatness should be at least 7x the passband
frequency to minimize group delay variations from the
amplifier. A high slew rate minimizes distortion of the
video signal, and supports component video and
RGB video signals that require fast transition times
and fast settling times for high signal quality.
1.21 kΩ 1.21 kΩ
15 V
−
75-Ω Transmission Line
75 Ω
V_O(1)
V_I
+
−15 V
75 Ω
n Lines
75 Ω
75 Ω
V_O(n)
75 Ω
Figure 62. Video Distribution Amplifier
Application
18
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