Texas Instruments THS4513EVM Evaluation Module THS4513EVM THS4513EVM Datenbogen
Produktcode
THS4513EVM
÷
÷
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
R
F
V
OUT+
V
OUT–
V
S+
V
IN–
V
S–
R
F
R
G
R
G
V
IN+
THS4513
Differential
Input
Differential
Output
+
–
–
+
V
S
Single-Ended
Input
V
S
R
F
R
F
R
G
R
G
THS 4513
Differential
Output
V
OUT+
V
OUT–
+
–
–
+
SLOS472E – AUGUST 2005 – REVISED JANUARY 2013
APPLICATION INFORMATION
Amplifier
APPLICATIONS
The THS4513 can be used to amplify and convert
single-ended
single-ended
input
signals
to
differential
output
The following circuits show application information for
signals. A basic block diagram of the circuit is shown
the
THS4513.
For
simplicity,
power-supply
in
(CM input not shown). The gain of the
decoupling
capacitors
are
not
shown
in
these
circuit is again set by R
F
divided by R
G
.
diagrams. Please see the
section for
recommendations. For more detail on the use and
operation of fully-differential op amps refer to the
application
operation of fully-differential op amps refer to the
application
report,
Fully-Differential
Amplifiers
Differential Input to Differential Output Amplifier
The THS4513 is a fully-differential op amp, and can
be used to amplify differential input signals to
differential output signals. A basic block diagram of
the circuit is shown in
be used to amplify differential input signals to
differential output signals. A basic block diagram of
the circuit is shown in
(CM input not
shown). The gain of the circuit is set by R
F
divided by
R
G
.
Figure 77. Single-Ended Input to Differential
Output Amplifier
Input Common-Mode Voltage Range
The input common-model voltage of a fully differential
op amp is the voltage at the '+' and '–' input pins of
the op amp.
op amp is the voltage at the '+' and '–' input pins of
the op amp.
It is important to not violate the input common-mode
voltage range (V
voltage range (V
ICR
) of the op amp. Assuming the op
amp 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 will determine the input
common-mode voltage of the op amp.
pins is only a few millivolts at most. So finding the
voltage at one input pin will determine the input
common-mode voltage of the op amp.
Figure 76. Differential Input to Differential Output
Treating the negative input as a summing node, the
Amplifier
voltage is given by
:
Depending on the source and load, input and output
termination can be accomplished by adding R
termination can be accomplished by adding R
IT
and
(1)
R
O
.
To determine the V
ICR
of the op amp, the voltage at
Single-Ended Input to Differential Output
the negative input is evaluated at the extremes of
V
V
OUT+
.
As the gain of the op amp increases, the input
common-mode voltage becomes closer and closer to
the input common-mode voltage of the source.
common-mode voltage becomes closer and closer to
the input common-mode voltage of the source.
Copyright © 2005–2013, Texas Instruments Incorporated
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