THS3110 Datasheet, PDF (16/28 Pages) Texas Instruments – LOW-NOISE, HIGH-VOLTAGE, CURRENT-FEEDBACK, OPERATIONAL AMPLIFIERS

THS3110, THS3111
SLOS422A – SEPTEMBER 2003 – REVISED NOVEMBER 2003
WIDEBAND, INVERTING OPERATION
Figure 44 shows the THS3111 in a typical inverting
gain configuration where the input and output im-
pedances and signal gain from Figure 43 are retained
in an inverting circuit configuration.
15 V _+VS
50 Ω Source _RG
V_I
549 Ω
R_M
56.2 Ω
0.1 µF
+
6.8 µF
+
THS3110
_
49.9 Ω
50 Ω LOAD
R_F
1.1 kΩ
0.1 µF
6.8 µF
+
-15 V ^-VS
Figure 44. Wideband, Inverting Gain
Configuration
SINGLE SUPPLY OPERATION
The THS3110 and THS3111 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 45 shows inverting and
noninverting amplifiers configured for single supply
operations.
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+V_S
50 Ω Source
+
V_I
R_T
49.9 Ω
THS3110
_
+V_S
2
R_F
R_G
1 kΩ
1 kΩ
49.9 Ω
50 Ω LOAD
+V_S
2
50 Ω Source
R_G
V_I
549 Ω
56.2 Ω R_T
+V_S +V_S
2
2
R_F
1.1 kΩ
V_S
_
THS3110
+
49.9 Ω
50 Ω LOAD
Figure 45. DC-Coupled, Single-Supply Operation
Video Distribution
The wide bandwidth, high slew rate, and high output
drive current of the THS3110 and THS3111 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 vari-
ations 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 kΩ
1 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 46. Video Distribution Amplifier
Application
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