THS3110_14 Datasheet, PDF (17/38 Pages) Texas Instruments – LOW-NOISE, HIGH-VOLTAGE, CURRENT-FEEDBACK OPERATIONAL AMPLIFIERS

THS3110
THS3111
www.ti.com........................................................................................................................................ SLOS422E – SEPTEMBER 2003 – REVISED OCTOBER 2009
WIDEBAND, INVERTING OPERATION
Figure 52 shows the THS3111 in a typical inverting
gain configuration where the input and output
impedances and signal gain from Figure 51 are
retained in an inverting circuit configuration.
50 Ω Source _RG
V_I
549 Ω
R_M
56.2 Ω
15 V _+VS
0.1 µF
+
6.8 µF
+
T_{_}HS3110
49.9 Ω
50 Ω LOAD
R_F
1.1 kΩ
0.1 µF
6.8 µF
+
-15 V ^-VS
Figure 52. 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 53 shows inverting and
noninverting amplifiers configured for single supply
operations.
+V_S
50 Ω Source
V_I
R_T ^{49.9 Ω}
+
THS3110
_
+V_S
2
R_F
R_G
1 kΩ
1 kΩ
+V_S
2
50 Ω Source
R_G
V_I
549 Ω
56.2 Ω R_T
R_F
1.1 kΩ
V_S
_
THS3110
+
+V_S +V_S
2
2
49.9 Ω
50 Ω LOAD
49.9 Ω
50 Ω LOAD
Figure 53. DC-Coupled, Single-Supply Operation
Video Distribution
The wide bandwidth, high slew rate, and high output
drive current of the THS3110 and THS3111 match
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 kΩ
1 kΩ
15 V
-
V_I
+
-15 V
75 Ω
75-Ω Transmission Line
75 Ω
V_O(1)
n Lines
75 Ω
75 Ω
V_O(n)
75 Ω
Figure 54. Video Distribution Amplifier
Application
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Product Folder Link(s): THS3110 THS3111
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