Texas Instruments THS4511EVM Evaluation Module THS4511EVM THS4511EVM Datenbogen
Produktcode
THS4511EVM
5 V
Single-Ended
Input
R
F
R
F
R
G
R
G
THS4511
Differential
Output
V
OUT+
V
OUT–
+
–
–
+
R
F
V
OUT+
V
OUT–
5 V
V
IN–
R
F
R
G
R
G
V
IN+
THS4511
Differential
Input
Differential
Output
+
–
–
+
÷
÷
ø
ø
ö
ç
ç
è
è
æ
+
´
+
÷
÷
ø
ø
ö
ç
ç
è
è
æ
+
´
=
-
+
F
G
F
IN
F
G
G
OUT
IC
R
R
R
V
R
R
R
V
V
www.ti.com
SLOS471E – SEPTEMBER 2005 – REVISED NOVEMBER 2009
APPLICATION INFORMATION
APPLICATIONS
The following circuits show application information for
the
the
THS4511.
For
simplicity,
power-supply
decoupling
capacitors
are
not
shown
in
these
diagrams. For more detail on the use and operation
of fully-differential operational amplifiers refer to
application
of fully-differential operational amplifiers refer to
application
report
Fully-Differential
Amplifiers
Differential Input to Differential Output Amplifier
The
THS4511
is
a
fully-differential
operational
amplifier, and can be used to amplify differential input
signals to differential output signals. A basic block
signals to differential output signals. A basic block
Figure 44. Single-Ended Input to Differential
diagram of the circuit is shown in
(CM input
Output Amplifier
not shown). The gain of the circuit is set by R
F
divided by R
G
.
Input Common-Mode Voltage Range
The input common-model voltage of a fully-differential
operational amplifier is the voltage at the (+) and (–)
input pins of the operational amplifier.
operational amplifier is the voltage at the (+) and (–)
input pins of the operational amplifier.
It is important to not violate the input common-mode
voltage range (V
voltage range (V
ICR
) of the operational amplifier.
Assuming the operational amplifier is in linear
operation the voltage across the input pins is only a
few millivolts at most. So finding the voltage at one
input pin determines the input common-mode voltage
of the operational amplifier.
operation the voltage across the input pins is only a
few millivolts at most. So finding the voltage at one
input pin determines the input common-mode voltage
of the operational amplifier.
Treating the negative input as a summing node, the
voltage is given by
voltage is given by
:
Figure 43. Differential Input to Differential Output
(1)
Amplifier
To determine the V
ICR
of the operational amplifier, the
voltage at the negative input is evaluated at the
Depending on the source and load, input and output
extremes of V
OUT+
.
termination can be accomplished by adding R
IT
and
R
O
.
As the gain of the operational amplifier increases, the
input common-mode voltage becomes closer and
input common-mode voltage becomes closer and
Single-Ended Input to Differential Output
closer to the input common-mode voltage of the
Amplifier
source.
The THS4511 can be used to amplify and convert
single-ended
single-ended
input
signals
to
differential
output
signals. A basic block diagram of the circuit is shown
in
in
(CM input not shown). The gain of the
circuit is again set by R
F
divided by R
G
.
Copyright © 2005–2009, Texas Instruments Incorporated
19
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