Datasheet
_
+
THS3120
49.9 Ω
50 Ω Source
V
I
+V
S
R
F
649 Ω
R
G
649 Ω
+V
S
2
+V
S
2
_
+
THS3120
340 Ω
50 Ω Source
V
I
V
S
R
F
681 Ω
+V
S
2
+V
S
2
59 Ω
R
G
R
T
R
T
49.9 Ω
49.9 Ω
50 Ω LOAD
50 Ω LOAD
_
+
THS3120
R
G
340 Ω
0.1 µF 6.8 µF
-V
S
-15 V
50 Ω Source
+
V
I
0.1 µF 6.8 µF
+
+V
S
15 V
R
F
681 Ω
R
M
59 Ω
49.9 Ω
50 Ω LOAD
+
-
75 Ω
75 Ω
75 Ω
75 Ω
75 Ω
n Lines
V
O(1)
V
O(n)
75-Ω Transmission Line
V
I
649 Ω 649 Ω
-15 V
15 V
THS3120
THS3121
SLOS420E –SEPTEMBER 2003–REVISED OCTOBER 2009........................................................................................................................................
www.ti.com
WIDEBAND, INVERTING OPERATION
Figure 48 shows the THS3121 in a typical inverting
gain configuration where the input and output
impedances and signal gain from Figure 47 are
retained in an inverting circuit configuration.
Figure 49. DC-Coupled, Single-Supply Operation
Figure 48. Wideband, Inverting Gain
Configuration
Video Distribution
The wide bandwidth, high slew rate, and high output
SINGLE-SUPPLY OPERATION
drive current of the THS3120 and THS3121 matches
The THS3120 and THS3121 have the capability to
the demands for video distribution for delivering video
operate from a single supply voltage ranging from
signals down multiple cables. To ensure high signal
10 V to 30 V. When operating from a single power
quality with minimal degradation of performance, a
supply, biasing the input and output at mid-supply
0.1-dB gain flatness should be at least 7x the
allows for the maximum output voltage swing. The
passband frequency to minimize group delay
circuits of Figure 49 show inverting and noninverting
variations from the amplifier. A high slew rate
amplifiers configured for single-supply operation.
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.
Figure 50. Video Distribution Amplifier
Application
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