參數(shù)資料
型號： THS4275MDREP
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
封裝： PLASTIC, SOP-8
文件頁數(shù)： 22/39頁
文件大?。?/td> 915K
代理商： THS4275MDREP
THS4271EP
THS4275EP
SGLS270B DECEMBER 2004 REVISED JULY 2008
www.ti.com
29
DESIGN TOOLS
Performance vs Package Options
The THS4271 and THS4275 are offered in different
package options. However, performance may be limited
due to package parasitics and lead inductance in some
packages. In order to achieve maximum performance of
the
THS4271
and
THS4275,
Texas
Instruments
recommends using the leadless MSOP (DRB) or MSOP
(DGN) packages, in addition to proper high-speed PCB
layout. Figure 93 shows the unity gain frequency response
of the THS4271 using the leadless MSOP, MSOP, and
SOIC package for comparison. Using the THS4271 and
THS4275 in a unity gain with the SOIC package may result
in the device becoming unstable. In higher gain
configurations, this effect is mitigated by the reduced
bandwidth. As such, the SOIC is suitable for application
with gains equal to or higher than +2 V/V or (1 V/V).
Figure 93. Effects of Unity Gain Frequency
Response for Differential Packages
4
2
10
12
14
16
18
20
10 M
100 M
1 G
f Frequency Hz
Normalized
Gain
dB
_
+
Rf
49.9
150
0
8
6
4
2
SOIC, Rf = 0
SOIC,
Rf = 100
SOIC, Rf = 200
Leadless MSOP, &
MSOP Rf = 0
VIN = 100 mVPP
VS =±5 V
Evaluation Fixtures, Spice Models, and
Applications Support
Texas Instruments is committed to providing its customers
with the highest quality of applications support. To support
this goal, evaluation boards have been developed for the
THS4271 operational amplifier. Three evaluation boards
are available: one THS4271 and one THS4275, both are
configurable for different gains and a third for a gain of +1
(THS4271 only). These boards are easy to use, allowing
for straightforward evaluation of the device. These
evaluation boards can be ordered through the Texas
Instruments web site, www.ti.com, or through your local
Texas Instruments sales representative. Schematics for
the evaluation boards are shown below.
The THS4271/THS4275 EVM board shown in Figure 97
through Figure 100 is designed to accommodate different
gain configurations. Its default component values are set
to give a gain of two. The EVM can be configured in a gain
of +1; however, it is strongly not recommended. Evaluating
the THS4271/THS4275 in a gain of one using this EVM
may cause the part to become unstable. The stability of the
device can be controlled by adding a large resistor in the
feedback path, the performance is sacrificed. Figure 94
shows the small signal frequency response of the
THS4271 with different feedback resistors in the feedback
path. Figure 95 is the small frequency response of the
THS4271 using the gain of 1 EVM.
Figure 94. Frequency Response vs Feedback
Resistor Using the EDGE #6439527 EVM
5
3
1
3
5
7
9
11
13
15
17
10M
100M
1G
f Frequency Hz
Small
Signal
Gain
dB
_
+
Rf
49.9
150
VIN = 100 mVPP
VS = ±5 V
Rf = 150
Rf = 100
Rf = 50
Rf = 0
Figure 95. Frequency Response Using the
EDGE # 6443547 G = +1 EVM
4
3
2
1
0
1
2
3
4
100 k
1 M
10 M
100 M
1 G
10 G
f Frequency Hz
Small
Signal
Gain
dB
Gain = 1
RL = 150
VO = 100 mVPP
VS = ±5 V
_
+
49.9
150
The peaking in the frequency response is due to the lead
inductance in the feedback path. Each pad and trace on a
PCB has an inductance associated with it, which in
conjunction with the inductance associated with the
package may cause peaking in the frequency response,
causing the device to become unstable.
相關(guān)PDF資料
PDF描述
THS4271MDGNREPR 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
THS4275DGNRG4 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
THS4275DRG4 1 CHANNEL, VIDEO PREAMPLIFIER, PDSO8
THS4275MDGNTEPR 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
THS4275MDGNREPR 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
THS4281 制造商:TI 制造商全稱:Texas Instruments 功能描述:VERY LOW-POWER, HIGH-SPEED, RAIL-TO-RAIL INPUT AND OUTPUT VOLTAGE-FEEDBACK OPERATIONAL AMPLIFIER
THS4281D 功能描述:高速運算放大器 Very Lo-Pwr R-To-R I/O Voltage Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
THS4281DBVR 功能描述:高速運算放大器 Very Lo-Pwr R-To-R I/O Voltage Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
THS4281DBVRG4 功能描述:高速運算放大器 Very Lo-Pwr R-To-R I/O Voltage Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
THS4281DBVT 功能描述:高速運算放大器 Very Lo-Pwr R-To-R I/O Voltage Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
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