參數(shù)資料
型號(hào)： THS4500CDGK
廠(chǎng)商： Texas Instruments, Inc.
元件分類(lèi)： 運(yùn)動(dòng)控制電子
英文描述： WIDEBAND, LOW DISTORTION FULLY DIFFERENTIAL AMPLIFIERS
中文描述： 寬帶，低失真全差動(dòng)放大器
文件頁(yè)數(shù)： 23/37頁(yè)
文件大?。?/td> 585K
代理商： THS4500CDGK
SLOS350D APRIL 2002 REVISED JANUARY 2004
www.ti.com
23
CHOOSING THE PROPER VALUE FOR THE
FEEDBACK AND GAIN RESISTORS
The selection of feedback and gain resistors impacts
circuit performance in a number of ways. The values in this
section provide the optimum high frequency performance
(lowest distortion, flat frequency response). Since the
THS4500 family of amplifiers is developed with a voltage
feedback architecture, the choice of resistor values does
not have a dominant effect on bandwidth, unlike a current
feedback amplifier. However, resistor choices do have
second-order effects. For optimal performance, the
following feedback resistor values are recommended. In
higher gain configurations (gain greater than two), the
feedback resistor values have much less effect on the high
frequency performance. Example feedback and gain
resistor values are given in the section on basic design
considerations (Table 3).
Amplifier loading, noise, and the flatness of the frequency
response are three design parameters that should be
considered when selecting feedback resistors. Larger
resistor values contribute more noise and can induce
peaking in the ac response in low gain configurations, and
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,
directly impacting the input impedance of the entire circuit.
While there are no strict rules about resistor selection,
these trends can provide qualitative design guidance.
APPLICATION CIRCUITS USING FULLY
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 some common circuit
configurations and gives some design guidelines.
Designing the interface to an ADC, driving lines
differentially, and filtering with fully differential amplifiers
are a few of the circuits that are covered.
BASIC DESIGN CONSIDERATIONS
The circuits in Figures 100 through 104 are used to
highlight basic design considerations for fully differential
amplifier circuit designs.
Table 3. Resistor Values for Balanced Operation
in Various Gain Configurations
Gain
V
OD
V
IN
1
R2 & R4 (
)
R1 (
)
R3 (
)
RT (
)
392
412
383
54.9
1
499
523
487
53.6
2
392
215
187
60.4
2
1.3k
665
634
52.3
5
1.3k
274
249
56.2
5
3.32k
681
649
52.3
10
1.3k
147
118
64.9
10
6.81k
698
681
52.3
NOTE: Values in the table above assume a 50
source impedance.
VOCM
Vn
VS
RS
R1
RT
R2
R4
+
+
Vout+
Vout
R3
VP
Figure 100
Equations for calculating fully differential amplifier resistor
values in order to obtain balanced operation in the
presence of a 50-
source impedance are given in
equations 6 through 9.
R
T
1
1
R
S
–
1–
K
2(1
R3
K)
K
R2
R1
R2
R4
R3
R1
R
s
|| R
T
(6)
β
1
R1
R1
R2
β
2
R3
R
T
|| R
S
R
T
|| R
S
R3
R4
V
OD
V
S
2
1–
β
2
β
1
β
2
R
T
R
T
R
S
V
OD
V
IN
2
1–
β
2
β
1
β
2
(7)
(8)
(9)
For more detailed information about balance in fully
differential amplifiers, see
Fully Differential Amplifiers
,
referenced at the end of this data sheet.
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THS4500CDGKG4 功能描述:特殊用途放大器 High-Speed Fully Differential +/-5 V RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel
THS4500CDGKR 功能描述:特殊用途放大器 High-Speed Fully Differential +/-5 V RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel
THS4500CDGKRG4 功能描述:特殊用途放大器 High-Speed Fully Differential +/-5 V RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel
THS4500CDGN 功能描述:特殊用途放大器 High-Speed Fully Differential +/-5 V RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel
THS4500CDGNG4 功能描述:特殊用途放大器 High-Speed Fully Differential +/-5 V RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel
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