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| 型號(hào)： | THS3061DR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 CHANNEL, VIDEO PREAMPLIFIER, PDSO8 |
| 封裝： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 7/33頁 |
| 文件大小： | 1015K |
| 代理商： | THS3061DR |
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www.ti.com
SLOS394B – JULY 2002 – REVISED NOVEMBER 2009
Minimize parasitic capacitance to any ac ground
Connections to other wideband devices on the
for all signal I/O pins. Parasitic capacitance on the
board may be made with short direct traces or
output and input pins can cause instability. To
through onboard transmission lines. For short
reduce unwanted capacitance, a window around
connections, consider the trace and the input to
the signal I/O pins should be opened in all of the
the next device as a lumped capacitive load.
ground and power planes around those pins.
Relatively wide traces (50 mils to 100 mils) should
Ground and power planes should be unbroken
be used, preferably with ground and power planes
elsewhere on the board.
opened up around them. Estimate the total
capacitive load and determine if isolation resistors
Minimize the distance (< 0.25”) from the power
on the outputs are necessary. Low parasitic
supply pins to high frequency 0.1-
μF decoupling
capacitive loads (< 4 pF) may not need an RS
capacitors. At the device pins, the ground and
since
the
THS306x
family
is
nominally
power plane layout should not be in close
compensated to operate with a 2-pF parasitic
proximity to the signal I/O pins. Avoid narrow
load. Higher parasitic capacitive loads without an
power and ground traces to minimize inductance
RS are allowed as the signal gain increases
between the pins and the decoupling capacitors.
(increasing the unloaded phase margin). If a long
The power supply connections should always be
trace is required, and the 6-dB signal loss intrinsic
decoupled with these capacitors. Larger (6.8
μF or
to
a
doubly-terminated
transmission
line
is
more) tantalum decoupling capacitors, effective at
acceptable,
implement
a
matched-impedance
lower frequencies, should also be used on the
transmission line using microstrip or stripline
main
supply
pins.
These
may
be
placed
techniques (consult an ECL design handbook for
somewhat farther from the device and may be
microstrip and stripline layout techniques).
shared among several devices in the same area
of the printed circuit board (PCB). The primary
A 50-
environment is not necessary onboard,
goal
is
to
minimize
the
impedance
in
the
and in fact, a higher-impedance environment
differential-current
return
paths.
For
driving
improves
distortion
as
shown
in
the
differential loads with the THS3062, adding a
distortion-versus-load plots. With a characteristic
capacitor
between
the
power-supply
pins
board-trace impedance based on board material
improves
2nd-order
harmonic-distortion
and trace dimensions, a matching series resistor
performance. This also minimizes the current loop
is used in the trace from the output of the
formed by the differential drive.
THS306x, as well as a terminating shunt resistor
at the input of the destination device.
Careful
selection
and
placement
of
external
components
preserve
the
high
frequency
Remember also that the terminating impedance is
performance of the THS306x family. Resistors
the parallel combination of the shunt resistor and
should
be
a
very
low
reactance
type.
the input impedance of the destination device: this
Surface-mount resistors work best and allow a
total effective impedance should be set to match
tighter overall layout. Again, keep leads and PCB
the trace impedance. If the 6-dB attenuation of a
trace lengths as short as possible. Never use
doubly-terminated
transmission
line
is
wirebound-type
resistors
in
a
high-frequency
unacceptable,
a
long
trace
can
be
application. Since the output pin and inverting
series-terminated at the source end only. Treat
input pins are the most sensitive to parasitic
the trace as a capacitive load in this case. This
capacitance, always position the feedback and
does not preserve signal integrity as well as a
series-output resistors, if any, as close as possible
doubly-terminated line. If the input impedance of
to the inverting-input pins and output pins. Other
the destination device is low, there is some signal
network components, such as input-termination
attenuation due to the voltage divider formed by
resistors,
should
be
placed
close
to
the
the series output into the terminating impedance.
gain-setting resistors. Even with a low parasitic
Socketing a high speed part like the THS306x
capacitance
shunting
the
external
resistors,
family is not recommended. The additional lead
excessively
high
resistor
values
can
create
length and pin-to-pin capacitance introduced by
significant
time
constants
that
can
degrade
the socket can create an extremely troublesome
performance.
Good
axial
metal-film
or
parasitic
network
that
can
make
it
almost
surface-mount resistors have approximately 0.2
impossible to achieve a smooth, stable frequency
pF in shunt with the resistor. For resistor values >
response. Best results are obtained by soldering
2.0 k
, this parasitic capacitance can add a pole
the THS306x family parts directly onto the board.
and/or a zero that can affect circuit operation.
Keep
resistor
values
as
low
as
possible,
PowerPAD DESIGN CONSIDERATIONS
consistent with load-driving considerations.
The
THS306x
family
is
available
in
a
thermally-enhanced PowerPAD family of packages.
These packages are constructed using a downset
Copyright 2002–2009, Texas Instruments Incorporated
15
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| THS3061DRG4 | 功能描述:高速運(yùn)算放大器 Hi-Vltg Hi-Slew-Rate Current Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)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 |
| THS3061EVM | 功能描述:放大器 IC 開發(fā)工具 THS3061 Eval Mod RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評(píng)估:IR4302 工作電源電壓:13 V to 23 V |
| THS3062D | 功能描述:高速運(yùn)算放大器 Hi-Vltg Hi-Slew-Rate Current Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)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 |
| THS3062DDA | 功能描述:高速運(yùn)算放大器 Hi-Vltg Hi-Slew-Rate Current Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)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 |
| THS3062DDAG3 | 功能描述:高速運(yùn)算放大器 Hi-Vltg Hi-Slew-Rate Current Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)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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