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| 型号： | THS4500IDGKG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 运算放大器 |
| 英文描述： | OP-AMP, 1000 uV OFFSET-MAX, 300 MHz BAND WIDTH, PDSO8 |
| 封装： | GREEN, PLASTIC, MSOP-8 |
| 文件页数： | 17/47页 |
| 文件大小： | 1203K |
| 代理商： | THS4500IDGKG4 |
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CHOOSING THE PROPER VALUE FOR THE
BASIC DESIGN CONSIDERATIONS
Gain
V
OD
V
IN
R
T +
1
R
S
–
1–
K
2(1)K)
R3
K +
R2
R1
R2 + R4
R3 + R1 * Rs || RT
(6)
β
1 +
R1
R1 ) R2
β
2 +
R3 ) RT || RS
R3 ) RT || RS ) R4
(7)
APPLICATION CIRCUITS USING FULLY
V
OD
V
S
+ 2
1–
β
2
β
1 ) β2
R
T
R
T ) RS
(8)
V
OD
V
IN
+ 2
1–
β
2
β
1 ) β2
(9)
SLOS350E – APRIL 2002 – REVISED MAY 2008 .............................................................................................................................................................. www.ti.com
Table 2. Midrail Referenced
Gain
VIN+
VIN–
VIN
VOCM
VOD
VNMIN
VNMAX
(V/V)
(V)
(VPP)
(V)
(VPP)
(V)
1
0.5 to 4.5
2.5
4
2.5
4
2
3
2
1.5 to 3.5
2.5
2
2.5
4
2.16
2.83
4
2.0 to 3.0
2.5
1
2.5
4
2.3
2.7
8
2.25 to 2.75
2.5
0.5
2.5
4
2.389
2.61
FEEDBACK AND GAIN RESISTORS
The circuits in Figure 98 through Figure 100 are used
The selection of feedback and gain resistors impacts
to highlight basic design considerations for fully
circuit performance in a number of ways. The values
differential amplifier circuit designs.
presented in this section provide
the
optimum
high-frequency performance (lowest distortion, flat
Table 3. Resistor Values for Balanced Operation
in Various Gain Configurations
frequency response). Since the THS4500 family of
amplifiers is developed with a voltage feedback
architecture, the choice of resistor values does not
R2 and R4
R1 (
)
R3 (
)
RT ()
(
)
have a dominant effect on bandwidth, unlike a
current-feedback amplifier. However, resistor choices
1
392
412
383
54.9
do
have
second-order
effects.
For
optimal
performance, the following feedback resistor values
1
499
523
487
53.6
are recommended. In higher gain configurations (gain
2
392
215
187
60.4
greater than two), the feedback resistor values have
2
1.3 k
665
634
52.3
much less effect on the high-frequency performance.
5
1.3 k
274
249
56.2
Example feedback and gain resistor values are given
5
3.32 k
681
649
52.3
in
the
section
on
basic
design
considerations
(Table 3).
10
1.3 k
147
118
64.9
10
6.81 k
698
681
52.3
Amplifier loading, noise, and the flatness of the
frequency response are three design parameters that
Equations for calculating fully differential amplifier
should
be
considered
when
selecting
feedback
resistor values in order to obtain balanced operation
resistors. Larger resistor values contribute more noise
in the presence of a 50-
source impedance are
and can induce peaking in the ac response in low
given in Equation 6 through Equation 9.
gain configurations; smaller resistor values can load
the amplifier more heavily, resulting in a reduction in
distortion performance. In addition, feedback resistor
values, coupled with gain requirements, determine
the value of the gain resistors and directly impact the
input impedance of the entire circuit. While there are
no strict rules about resistor selection, these trends
can provide qualitative design guidance.
DIFFERENTIAL AMPLIFIERS
Fully differential amplifiers provide designers with a
great
deal
of
flexibility
in
a
wide
variety
of
applications. This section provides an overview of
For more detailed information about balance in fully
some common circuit configurations and gives some
differential amplifiers, see the application report, Fully
design guidelines. Designing the interface to an
Differential Amplifiers (SLOA054), referenced at the
analog-to-digital
converter
(ADC),
driving
lines
end of this data sheet.
differentially,
and
filtering
with
fully
differential
amplifiers are a few of the circuits that are covered.
24
Copyright 2002–2008, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| THS4500IDGKR | 功能描述:特殊用途放大器 High-Speed Fully Differential +/-5 V RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
| THS4500IDGKRG4 | 功能描述:特殊用途放大器 High-Speed Fully Differential +/-5 V RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
| THS4500IDGN | 功能描述:特殊用途放大器 High-Speed Fully Differential +/-5 V RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
| THS4500IDGNG4 | 功能描述:特殊用途放大器 High-Speed Fully Differential +/-5 V RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
| THS4500IDGNR | 功能描述:特殊用途放大器 High-Speed Fully Differential +/-5 V RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
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