參數(shù)資料
型號： OPA2652U2K5
英文描述： Dual, 700MHz, Voltage-Feedback OPERATIONAL AMPLIFIER
中文描述： 雙通道，700MHz的，電壓反饋運算放大器
文件頁數(shù)： 17/20頁
文件大?。?/td> 297K
代理商： OPA2652U2K5
www.ti.com
Input and ESD Protection
External
Pin
+V
CC
-
V
CC
Internal
Circuitry
OPA2652
SBOS125A–JUNE 2000–REVISED MAY 2006
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 0.2pF in
shunt with the resistor. For resistor values >1.5k
,
this parasitic capacitance can add a pole and/or zero
below 500MHz that can effect circuit operation. Keep
resistor values as low as possible consistent with
load driving considerations. The 402
feedback
used in the typical performance specifications is a
good starting point for design. Note that a 25
feedback resistor, rather than a direct short, is
suggested for the unity gain follower application. This
effectively isolates the inverting input capacitance
from the output pin that would otherwise cause
additional peaking in the gain of +1 frequency
response.
devices to be handled as separate transmission
lines,
each
with
respective
terminations.
If
the
6dB
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 Recommended R
vs Capacitive Load
(
Figure 17
). This configuration will not preserve
signal integrity as well as a doubly-terminated line. If
the input impedance of the destination device is low,
there will be some signal attenuation due to the
voltage divider formed by the series output into the
terminating impedance.
series
attenuation
and
shunt
of
a
e) Socketing a high-speed part like the OPA2652
is not recommended.
The additional lead length
and pin-to-pin capacitance introduced by the socket
can
create
an
extremely
network that can make it almost impossible to
achieve a smooth, stable frequency response. Best
results are obtained by soldering the OPA2652
directly onto the board.
troublesome
parasitic
d) Connections to other wideband devices
on the
board may be made with short direct traces or
through
onboard
transmission
connections, consider the trace and the input to the
next device as a lumped capacitive load. Relatively
wide traces (50mils to 100mils) should be used,
preferably with ground and power planes opened up
around them. Estimate the total capacitive load and
set R
S
from the plot of Recommended R
S
vs
Capacitive Load (
Figure 17
). Low parasitic capacitive
loads (< 5pF) may not need an R
S
since the
OPA2652 is nominally compensated to operate with
a 2pF parasitic load. Higher parasitic capacitive
loads without an R
S
are allowed as the signal gain
increases (increasing the unloaded phase margin) If
a long trace is required, and the 6dB signal loss
intrinsic to a doubly-terminated transmission line is
acceptable,
implement
transmission
line
using
techniques (consult an ECL design handbook for
microstrip and stripline layout techniques). A 50
environment is normally not necessary on board, and
in fact, a higher impedance environment will improve
distortion as shown in the distortion versus load
plots. With a characteristic board trace impedance
defined
(based
on
board
dimensions), a matching series resistor into the trace
from the output of the OPA2652 is used as well as a
terminating
shunt
resistor
destination
device.
Remember
terminating
impedance
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. The high output voltage and current
capability of the OPA2652 allows multiple destination
lines.
For
short
The OPA2652 is built using a very high-speed
complementary bipolar process. The internal junction
breakdown voltages are relatively low for these very
small geometry devices. These breakdowns are
reflected in the
Absolute Maximum Ratings
table. All
device
pins
are
protected
protection diodes to the power supplies as shown in
Figure 37
.
with
internal
ESD
These diodes provide moderate protection to input
overdrive voltages above the supplies as well. The
protection
diodes
can
continuous
current.
Where
possible (for example, in systems with
±
15V supply
parts driving into the OPA2652), current-limiting
series resistors should be added into the two inputs.
Keep these resistor values as low as possible since
high values degrade both noise performance and
frequency response.
typically
support
currents
30mA
are
a
matched
microstrip
impedance
or
stripline
higher
material
and
trace
at
the
input
also
the
of
the
the
that
will
be
parallel
Figure 37. Internal ESD Protection
17
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
OPA2652UG4 功能描述:高速運算放大器 Dual 700MHz 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
OPA2658E 制造商:Rochester Electronics LLC 功能描述:- Bulk
OPA2658E1250 制造商:Rochester Electronics LLC 功能描述:- Bulk
OPA2658P 功能描述:高速運算放大器 Dual Wideband 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
OPA2658U 功能描述:高速運算放大器 Dual Wideband 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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