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参数资料
| 型号： | 5962-0722301VFA |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 运算放大器 |
| 英文描述： | OP-AMP, 5500 uV OFFSET-MAX, 3000 MHz BAND WIDTH, CDFP16 |
| 封装： | CERAMIC, CFP-16 |
| 文件页数： | 14/30页 |
| 文件大小： | 1043K |
| 代理商： | 5962-0722301VFA |
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APPLICATION INFORMATION
APPLICATIONS
Differential Input to Differential Output Amplifier
VS
Single-Ended
Input
VS
RF
RG
THS 4513
Differential
Output
V
OUT+
V
OUT–
+
–
+
Input Common-Mode Voltage Range
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
+
–
+
÷
è
+
+
÷
è
+
=
-
+
F
G
F
IN
F
G
OUT
IC
R
V
R
V
(1)
Single-Ended Input to Differential Output
Setting the Output Common-Mode Voltage
SLOS539A – SEPTEMBER 2007 – REVISED OCTOBER 2007
The following circuits show application information for
the THS4513. For simplicity, power supply decoupling
capacitors are not shown in these diagrams. Please
see the THS4513 EVM section for recommendations.
For more detail on the use and operation of fully
differential op amps refer to
application
report
Fully-Differential Amplifiers (SLOA054) .
The THS4513 is a fully differential op amp and can
be used to amplify differential input signals to
Figure 61. Single-Ended Input to Differential
differential output signals. A basic block diagram of
Output Amplifier
the circuit is shown in Figure 60 (CM input not
shown). The gain of the circuit is set by RF divided by
RG.
The input common-mode voltage of a fully differential
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 (VICR) 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.
Treating the negative input as a summing node, the
voltage is given by Equation 1:
Figure 60. Differential Input to Differential Output
To determine the VICR of the op amp, the voltage at
Amplifier
the negative input is evaluated at the extremes of
VOUT+.
Depending on the source and load, input and output
termination can be accomplished by adding RIT and
As the gain of the op amp increases, the input
RO.
common-mode voltage becomes closer and closer to
the input common-mode voltage of the source.
Amplifier
The THS4513 can be used to amplify and convert
The output common-mode voltage is set by the
single-ended
input
signals
to
differential
output
voltage at the CM pin(s). The internal common-mode
signals. A basic block diagram of the circuit is shown
control circuit maintains the output common-mode
in Figure 61 (CM input not shown). The gain of the
voltage within 3 mV offset (typ) from the set voltage,
circuit is again set by RF divided by RG.
when set within 0.5 V of mid-supply, with less than
4 mV differential offset voltage. If left unconnected,
the common-mode set point is set to mid-supply by
internal circuitry, which may be over-driven from an
external source. Figure 62 is representative of the
CM input. The internal CM circuit has about 700 MHz
of –3 dB bandwidth, which is required for best
Copyright 2007, Texas Instruments Incorporated
21
Product Folder Link(s): THS4513-SP
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