參數(shù)資料
型號： THS4130EVM
廠商： Texas Instruments, Inc.
英文描述： HIGH SPEED LOW NOISE, FULLY DIFFERENTIAL I/O AMPLIFIERS
中文描述： 高速低噪音，完全不同的I / O功放
文件頁數(shù)： 20/27頁
文件大?。?/td> 569K
代理商： THS4130EVM
SLOS318E MAY 2000 REVISED JANUARY 2004
20
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
theory of operation (continued)
Fully differential amplifiers may be viewed as two inverting amplifiers. In this case, the equation of an inverting
amplifier holds true for gain calculations. One advantage of fully differential amplifiers is that they offer twice as
much dynamic range compared to single-ended amplifiers. For example, a 1-V
PP
ADC can only support an input
signal of 1 V
PP
. If the output of the amplifier is 2 V
PP
, then it will not be practical to feed a 2-V
PP
signal into the
targeted ADC. Using a fully differential amplifier enables the user to break down the output into two 1-V
PP
signals
with opposite signs and feed them into the differential input nodes of the ADC. In practice, the designer has been
able to feed a 2-V peak-to-peak signal into a 1-V differential ADC with the help of a fully differential amplifier.
The final result indicates twice as much dynamic range. Figure 39 illustrates the increase in dynamic range. The
gain factor should be considered in this scenario. The THS413x fully differential amplifier offers an improved
CMRR and PSRR due to its symmetrical input and output. Furthermore, second harmonic distortion is
improved. Second harmonics tend to cancel because of the symmetrical output.
VOCM
_
+
_
+
VCC+
VIN
VIN+
VO+
VO
VOD= 10 = 1
VOD = 01 = 1
a
b
+1
0
+1
0
VCC
Figure 39. Fully Differential Amplifier With Two 1-V
PP
Signals
Similar to the standard inverting amplifier configuration, input impedance of a fully differential amplifier is
selected by the input resistor, R
(g)
. If input impedance is a constraint in design, the designer may choose to
implement the differential amplifier as an instrumentation amplifier. This configuration improves the input
impedance of the fully differential amplifier. The following schematic depicts the general format of
instrumentation amplifiers.
The general transfer function for this circuit is:
VOD
VIN1– VIN2
Rf
R(g)
1
2R2
R1
_
+
_
+
_
+
THS4012
THS4012
VIN1
VIN2
R2
R1
R2
R(g)
R(g)
Rf
Rf
THS413x
Figure 40. Instrumentation Amplifier
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
THS4130ID 功能描述:差分放大器 Ln Diff. In/Out RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 Channel 帶寬:2.4 GHz 可用增益調(diào)整:6 dB to 26 dB 輸入補償電壓: 共模抑制比（最小值）:- 40 dB 工作電源電壓:4.75 V to 5.25 V 電源電流:100 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WQFN-24 封裝:Reel
THS4130ID 制造商:Texas Instruments 功能描述:IC AMP DIFF SMD 4130 SOIC8
THS4130IDG4 功能描述:差分放大器 Fully Differential I/O Low Noise RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 Channel 帶寬:2.4 GHz 可用增益調(diào)整:6 dB to 26 dB 輸入補償電壓: 共模抑制比（最小值）:- 40 dB 工作電源電壓:4.75 V to 5.25 V 電源電流:100 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WQFN-24 封裝:Reel
THS4130IDGK 功能描述:差分放大器 Fully Differential I/O Low Noise RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 Channel 帶寬:2.4 GHz 可用增益調(diào)整:6 dB to 26 dB 輸入補償電壓: 共模抑制比（最小值）:- 40 dB 工作電源電壓:4.75 V to 5.25 V 電源電流:100 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WQFN-24 封裝:Reel
THS4130IDGKG4 功能描述:差分放大器 Fully Differential I/O Low Noise RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 Channel 帶寬:2.4 GHz 可用增益調(diào)整:6 dB to 26 dB 輸入補償電壓: 共模抑制比（最小值）:- 40 dB 工作電源電壓:4.75 V to 5.25 V 電源電流:100 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WQFN-24 封裝:Reel
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