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參數(shù)資料
| 型號： | THS4140CDGK |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | HIGH SPEED FULLY DIFFERENTIAL I/O AMPLIFIERS |
| 中文描述： | 高速全差分的I / O功放 |
| 文件頁數(shù)： | 16/24頁 |
| 文件大?。?/td> | 523K |
| 代理商： | THS4140CDGK |
SLOS320E MAY 2000 REVISED JANUARY 2004
16
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
theory of operation (continued)
The following schematics depict the differences between the operation of the THS414x, fully differential
amplifier, in two different modes. Fully differential amplifiers can work with differential input or can be
implemented as single in/differential out.
Rf
R(g)
+
+
VCC
VCC+
R(g)
Rf
Vs
VIN
VIN+
VO+
VO
VOCM
Note: For proper operation, maintain
symmetry by setting
Rf1 = Rf2 = Rf and R(g)1 = R(g)2 = R(g)
A = Rf/R(g)
Figure 29. Amplifying Differential Signals
Rf
R(g)
+
+
VCC
VCC+
R(g)
Rf
Vs
VIN
VIN+
VO+
VO
VOCM
GAIN
R(g)
390
374
402
402
Rf
390
750
2010
4020
1
2
5
10
RECOMMENDED RESISTOR VALUES
Figure 30. Single In With Differential Out
If each output is measured independently, each output is one-half of the input signal when gain is 1. The
following equations express the transfer function for each output:
1
VO
The second output is equal and opposite in sign:
VO
–1
2VI
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 31 illustrates the increase in dynamic range. The
gain factor should be considered in this scenario. The THS414x 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.
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| THS4140CDGKG4 | 功能描述:特殊用途放大器 Fully Diff I/O High Slew Rate RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補償電壓: 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| THS4140CDGKR | 功能描述:特殊用途放大器 Fully Diff I/O High Slew Rate RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補償電壓: 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| THS4140CDGKRG4 | 功能描述:特殊用途放大器 Fully Diff I/O High Slew Rate RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補償電壓: 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| THS4140CDGN | 功能描述:特殊用途放大器 Fully Diff I/O High Slew Rate RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補償電壓: 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| THS4140CDGNG4 | 功能描述:特殊用途放大器 Fully Diff I/O High Slew Rate RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補償電壓: 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
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