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参数资料
| 型号： | THS4211DRB |
| 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： | PLASTIC, MSOP-8 |
| 文件页数： | 18/40页 |
| 文件大小： | 1013K |
| 代理商： | THS4211DRB |
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THS4211
THS4215
SLOS400C SEPTEMBER 2002 REVISED JANUARY 2004
www.ti.com
25
decoupling capacitors. The power supply connections
should always be decoupled with these capacitors.
Larger (2.2-
F to 6.8-F) decoupling capacitors,
effective at lower frequency, should also be used on
the main supply pins. These may be placed somewhat
farther from the device and may be shared among
several devices in the same area of the PC board.
3.
Careful selection and placement of external
components
preserves
the
high
frequency
performance of the THS4211. Resistors should be a
very low reactance type. Surface-mount resistors
work best and allow a tighter overall layout. Metal-film
and carbon composition, axially-leaded resistors can
also provide good high frequency performance.
Again, keep their leads and PC board trace length as
short as possible. Never use wire-wound type
resistors in a high frequency application. Since the
output pin and inverting input pin are the most
sensitive to parasitic capacitance, always position the
feedback and series output resistor, if any, as close as
possible to the output pin. Other network components,
such as noninverting input-termination resistors,
should also be placed close to the package. Where
double-side component mounting is allowed, place
the feedback resistor directly under the package on
the other side of the board between the output and
inverting input pins. Even with a low parasitic
capacitance
shunting
the
external
resistors,
excessively high resistor values can create significant
time constants that can degrade performance. Good
axial metal-film or surface-mount resistors have
approximately 0.2 pF in shunt with the resistor. For
resistor values > 2.0 k
, this parasitic capacitance can
add a pole and/or a zero below 400 MHz that can
effect circuit operation. Keep resistor values as low as
possible, consistent with load driving considerations.
A good starting point for design is to set the Rf to
249
for low-gain, noninverting applications. This
setting automatically keeps the resistor noise terms
low and minimizes the effect of their parasitic
capacitance.
4.
Connections to other wideband devices on the
board may be made with short direct traces or
through onboard transmission lines. For short
connections, consider the trace and the input to the
next device as a lumped capacitive load. Relatively
wide traces (50 mils to 100 mils) should be used,
preferably with ground and power planes opened up
around them. Estimate the total capacitive load and
set RISO from the plot of recommended RISO vs
capacitive load. Low parasitic capacitive loads
(<4 pF) may not need an R(ISO), since the THS4211 is
nominally compensated to operate with a 2-pF
parasitic load. Higher parasitic capacitive loads
without an R(ISO) are allowed as the signal gain
increases (increasing the unloaded phase margin). If
a long trace is required, and the 6-dB signal loss
intrinsic to a doubly-terminated transmission line is
acceptable,
implement
a
matched
impedance
transmission
line
using
microstrip
or
stripline
techniques (consult an ECL design handbook for
microstrip and stripline layout techniques). A 50-
environment is normally not necessary onboard, and
in fact a higher impedance environment improves
distortion as shown in the distortion versus load plots.
With a characteristic board trace impedance defined
on the basis of board material and trace dimensions,
a matching series resistor into the trace from the
output of the THS4211 is used as well as a terminating
shunt resistor at the input of the destination device.
Remember also that the terminating impedance is the
parallel combination of the shunt resistor and the input
impedance of the destination device: this total
effective impedance should be set to match the trace
impedance. If the 6-dB attenuation of a doubly
terminated transmission line is unacceptable, a long
trace can be series-terminated at the source end only.
Treat the trace as a capacitive load in this case and set
the series resistor value as shown in the plot of R(ISO)
vs capacitive load. This setting does not preserve
signal integrity or a doubly-terminated line. If the input
impedance of the destination device is low, there is
some signal attenuation due to the voltage divider
formed by the series output into the terminating
impedance.
5.
Socketing a high speed part like the THS4211 is
not recommended. The additional lead length and
pin-to-pin capacitance introduced by the socket can
create a troublesome parasitic network which can
make it almost impossible to achieve a smooth, stable
frequency response. Best results are obtained by
soldering the THS4211 onto the board.
PowerPAD
DESIGN CONSIDERATIONS
The
THS4211
and
THS4215
are
available
in
a
thermally-enhanced PowerPAD family of packages.
These packages are constructed using a downset
leadframe
upon
which
the
die
is
mounted
[see
Figure 89(a) and Figure 89(b)]. This arrangement results
in the lead frame being exposed as a thermal pad on the
underside of the package [see Figure 89(c)]. Because this
thermal pad has direct thermal contact with the die,
excellent thermal performance can be achieved by
providing a good thermal path away from the thermal pad.
The PowerPAD package allows both assembly and
thermal management in one manufacturing operation.
During the surface-mount solder operation (when the
leads are being soldered), the thermal pad can also be
soldered to a copper area underneath the package.
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| THS4215DG4 | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| THS4215DGNR | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| THS4215DGN | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| THS4211DRBR | 功能描述:高速运算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed 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 |
| THS4211DRBRG4 | 功能描述:高速运算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed 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 |
| THS4211DRBT | 功能描述:高速运算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed 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 |
| THS4211DRBTG4 | 功能描述:高速运算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed 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 |
| THS4211DRG4 | 功能描述:高速运算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed 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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