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参数资料
| 型号： | THS4281DG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| 封装： | GREEN, PLASTIC, SOIC-8 |
| 文件页数： | 13/37页 |
| 文件大小： | 1063K |
| 代理商： | THS4281DG4 |
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+
5 V
5 V
2.1 kW
2.05 kW
2.2 nF
VO
RL
1 kW
VI
270 pF
1.02 kW
80
70
60
50
40
30
20
10
0
10
1k
10k
100k
1M
10M
100M
Signal
Gain
dB
Sallen-Key
Response
MFB
Response
VS = 3 V, 5 V, ±5 V, 15 V,
VO = 100 mVPP
f Frequency Hz
_
+
5 V
5 V
2 kW
1 nF
2.61 kW
1.5 nF
649 W
VO
RL
1 kW
VI
SLOS432A – APRIL 2004 – REVISED NOVEMBER 2009
www.ti.com
APPLICATION CIRCUITS
Active Filtering with the THS4281
High-performance active filtering with the THS4281 is
achievable due to the amplifier's good slew rate, wide
bandwidth,
and
voltage-feedback
architecture.
Several options are available for high-pass, low-pass,
bandpass, and bandstop filters of varying orders.
Filters can be quite complex and time consuming to
design. Several books and application reports are
available to help design active filters. But, to help
simplify the process and minimize the chance of
miscalculations, Texas Instruments has developed a
filter design program called FilterPro. FilterPro is
available for download at no cost from TI's web site
Figure 74. Second-Order MFB 100-kHz
Butterworth Filter, Gain = 2 V/V
The two most common low-pass filter circuits used
are the Sallen-Key filter and the Multiple Feedback
(MFB) – aka Rauch filter. FilterPro was used to
determine a 2-pole Butterworth response filter with a
corner (–3-dB) frequency of 100 kHz, which is shown
in Figure 73 and Figure 74. One of the advantages of
the MFB filter, a much better high-frequency rejection,
is clearly shown in the response shown in Figure 75.
This is due to the inherent R-C filter to ground being
the first elements in the design of the MFB filter. The
Sallen-Key design also has an R-C filter, but the
capacitor connects directly to the output. At very high
frequencies, where the amplifier's access loop gain is
decreasing, the ability of the amplifier to reject high
frequencies is severely reduced and allows the
high-frequency signals to pass through the system.
One other advantage of the MFB filter is the reduced
Figure 75. Second-Order 100-kHz Active Filter
sensitivity in component variation. This is important
Response
when using real-world components where capacitors
can easily have ±10% variations.
Driving Capacitive Loads
One of the most demanding, and yet common, load
conditions for an op amp is capacitive loading. Often,
the capacitive load is the input of an A/D converter,
including additional external capacitance, which may
be
recommended
to
improve
A/D
linearity.
A
high-speed, high open-loop gain amplifier like the
THS4281 can be susceptible to instability and
peaking when a capacitive load is placed directly on
the output. When the amplifier open-loop output
resistance
is
considered,
this
capacitive
load
Figure 73. Second-Order Sallen-Key 100-kHz
introduces an additional pole in the feedback path
Butterworth Filter, Gain = 2 V/V
that decreases the phase margin. When the primary
considerations
are
frequency
response
flatness,
pulse response fidelity, or distortion, a simple and
effective solution is to isolate the capacitive load from
the feedback loop by inserting a small series isolation
resistor (for example, R(ISO) = 100 Ω for CLOAD = 10
pF to R(ISO) = 10 Ω for CLOAD = 1000 pF) between the
amplifier output and the capacitive load.
20
Copyright 2004–2009, Texas Instruments Incorporated
Product Folder Link(s): THS4281
相关PDF资料 |
PDF描述 |
|---|---|
| THS4281DBVR | 1 CHANNEL, VIDEO AMPLIFIER, PDSO5 |
| THS4281DBVT | 1 CHANNEL, VIDEO AMPLIFIER, PDSO5 |
| THS4281DGKR | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| THS4281DGK | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| THS4281DR | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| THS4281DGK | 功能描述:高速运算放大器 Very Lo-Pwr R-To-R I/O Voltage Feedback RoHS:否 制造商:Texas Instruments 通道数量:1 电压增益 dB:116 dB 输入补偿电压:0.5 mV 转换速度:55 V/us 工作电源电压:36 V 电源电流:7.5 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| THS4281DGKG4 | 功能描述:高速运算放大器 Very Lo-Pwr R-To-R I/O Voltage Feedback RoHS:否 制造商:Texas Instruments 通道数量:1 电压增益 dB:116 dB 输入补偿电压:0.5 mV 转换速度:55 V/us 工作电源电压:36 V 电源电流:7.5 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| THS4281DGKR | 功能描述:高速运算放大器 Very Lo-Pwr R-To-R I/O Voltage Feedback RoHS:否 制造商:Texas Instruments 通道数量:1 电压增益 dB:116 dB 输入补偿电压:0.5 mV 转换速度:55 V/us 工作电源电压:36 V 电源电流:7.5 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| THS4281DGKRG4 | 功能描述:高速运算放大器 Very Lo-Pwr R-To-R I/O Voltage Feedback RoHS:否 制造商:Texas Instruments 通道数量:1 电压增益 dB:116 dB 输入补偿电压:0.5 mV 转换速度:55 V/us 工作电源电压:36 V 电源电流:7.5 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| THS4281DR | 功能描述:高速运算放大器 Very Lo-Pwr R-To-R I/O Voltage Feedback RoHS:否 制造商:Texas Instruments 通道数量:1 电压增益 dB:116 dB 输入补偿电压:0.5 mV 转换速度:55 V/us 工作电源电压:36 V 电源电流:7.5 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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