Texas Instruments THS4281 Evaluation Module THS4281EVM THS4281EVM Datenbogen
Produktcode
THS4281EVM
_
+
R
f
2.49 k
Ω
49.9
Ω
0.1
µ
F
6.8
µ
F
−V
S
R
g
50-
Ω
Source
+
V
I
0.1
µ
F
6.8
µ
F
+
+V
S
V
O
2.49 k
Ω
To Load
0
4
8
12
16
20
24
0.1
1
10
100
V
S
=
3 V
Gain = 10,
R
R
L
= 1 k
Ω
,
V
O
= 0.1 V
PP
R
F
= 100 k
Ω
f − Frequency − MHz
R
F
= 1.65 k
Ω
and 10 k
Ω
Signal Gain − dB
0
4
8
12
16
20
24
0.1
1
10
100
V
S
=
±
5 V
Gain = 10,
R
R
L
= 1 k
Ω
,
V
O
= 0.1 V
PP
R
F
= 100 k
Ω
f − Frequency − MHz
R
F
= 2.5 k
Ω
and 10 k
Ω
Signal Gain − dB
SLOS432A – APRIL 2004 – REVISED NOVEMBER 2009
www.ti.com
APPLICATION INFORMATION
HIGH-SPEED OPERATIONAL AMPLIFIERS
The THS4281 is a unity gain stable, rail-to-rail input
and output, voltage-feedback operational amplifier
designed to operate from a single 2.7-V to 16.5-V
power supply.
and output, voltage-feedback operational amplifier
designed to operate from a single 2.7-V to 16.5-V
power supply.
Applications Section Contents
•
Wideband, Noninverting Operation
•
Wideband, Inverting Gain Operation
•
Video Drive Circuits
•
Single-Supply Operation
•
Power-Supply
Decoupling
Techniques
and
Recommendations
•
Active Filtering with the THS4281
•
Driving Capacitive Loads
Figure 68. Wideband, Noninverting Gain
•
Board Layout
Configuration
•
Thermal Analysis
•
Additional Reference Material
•
Mechanical Package Drawings
WIDEBAND, NONINVERTING OPERATION
shows the noninverting gain configuration
of 2 V/V used to demonstrate the typical performance
curves.
curves.
Voltage feedback amplifiers can use a wide range of
resistors values to set their gain with minimal impact
on
resistors values to set their gain with minimal impact
on
frequency
response.
Larger-valued
resistors
decrease loading of the feedback network on the
output of the amplifier, but may cause peaking and
instability. For a gain of +2, feedback resistor values
between 1 k
output of the amplifier, but may cause peaking and
instability. For a gain of +2, feedback resistor values
between 1 k
Ω
and 4 k
Ω
are recommended for most
applications. However, as the gain increases, the use
Figure 69. Signal Gain vs
of even higher feedback resistors can be used to
Frequency, V
S
= 3 V
conserve power. This is due to the inherent nature of
amplifiers
amplifiers
becoming
more
stable
as
the
gain
increases, at the expense of bandwidth.
and
show the THS4281 using feedback
resistors of 10 k
Ω
and 100 k
Ω
. Be cautioned that
using such high values with high-speed amplifiers is
not
not
typically
recommended,
but
under
certain
conditions, such as high gain and good high-speed
printed circuit board (PCB) layout practices, such
resistances can be used.
printed circuit board (PCB) layout practices, such
resistances can be used.
Figure 70. Signal Gain vs
Frequency, V
S
= ±5 V
18
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