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(yùn)算放大器
文件頁數(shù)： 14/20頁
文件大?。?/td> 297K
代理商： OPA2652U2K5
www.ti.com
Output Current and Voltage
Distortion Performance
Driving Capacitive Loads
Noise Performance
OPA2652
SBOS125A–JUNE 2000–REVISED MAY 2006
error, as a result of the input bias currents, is
reduced to (Input Offset Current)
R
. If the 50
source impedance is DC-coupled in
Figure 29
, the
total resistance to ground on the inverting input will
be
429
.
Combining
this
feedback resistor gives 208
, which is close to the
R
B
= 205
used in
Figure 29
. To reduce the
additional high-frequency noise introduced by this
resistor, it is sometimes bypassed with a capacitor.
As long as R
B
<300
, the capacitor is not required
since its total noise contribution is much less than
that of the op amp input noise voltage.
directly on the output pin. When the amplifier
open-loop
output
resistance
capacitive load introduces an additional pole in the
signal path that can decrease the phase margin.
Several external solutions to this problem have been
suggested. When the primary considerations are
frequency response flatness, pulse response fidelity,
and/or distortion, the simplest and most effective
solution is to isolate the capacitive load from the
feedback loop by inserting a series isolation resistor
between the amplifier output and the capacitive load.
This resistor does not eliminate the pole from the
loop response, but rather shifts it and adds a zero at
a higher frequency. The additional zero acts to
cancel the phase lag from the capacitive load pole,
thus increasing the phase margin and improving
stability.
is
considered,
this
in
parallel
with
the
The OPA2652 specifications in the spec table,
though familiar in the industry, consider voltage and
current limits separately. In many applications, it is
the voltage
current, or VI product, that is more
relevant to circuit operation. Refer to the
Output
Voltage and Current Limitations
plot in the Typical
Characteristics. The X and Y axes of this graph show
the zero-voltage output current limit and the zero
current output voltage limit, respectively. The four
quadrants give a more detailed view of the device
output drive capabilities, noting that the graph is
bounded by a
Safe Operating Area
of 1W maximum
internal
power
dissipation
channel). Superimposing resistor load lines onto the
plot shows that the OPA2652 can drive
±
2.2V into
50
or
±
2.5V into 100
without exceeding the output
capabilities, or the 1W dissipation boundary line.
The Typical Characteristics show the recommended
R
S
versus
capacitive
load
frequency response at the load. Parasitic capacitive
loads greater than 2pF can begin to degrade the
performance of the OPA2652. Long PCB traces,
unmatched cables, and connections to multiple
devices
can
easily
exceed
consider
this
effect
carefully,
recommended series resistor as close as possible to
the
OPA2652
output
pin
Guidelines
).
and
the
resulting
this
value.
and
Always
add
the
(500mW
for
each
(see
Board
Layout
The OPA2652 provides good distortion performance
into a 100
load on
±
5V supplies. Increasing the
load
impedance
improves
Remember that the total load includes the feedback
network;
in
the
noninverting
(
Figure 28
), this is sum of R
F
+ R
G
, while in the
inverting configuration, it is only R
F
. Also, providing
an additional supply decoupling capacitor (0.1
μ
F)
between the supply pins (for bipolar operation)
improves the 2nd-order distortion slightly (3dB to
6dB).
To maintain maximum output stage linearity, no
output
short-circuit
protection
configuration will not normally be a problem since
most applications include a series matching resistor
at the output that limits the internal power dissipation
if the output side of this resistor is shorted to ground.
However, shorting the output pin directly to the
adjacent positive power supply pin will, in most
cases, destroy the amplifier. Including a small series
resistor (5
) in the power-supply line will protect
against this. Always place the 0.1
μ
F decoupling
capacitor directly on the supply pins.
is
provided.
This
distortion
directly.
configuration
It is also true that increasing the output voltage swing
increases harmonic distortion.
One of the most demanding and yet very common
load conditions for an op amp is capacitive loading.
Often, the capacitive load is the input of an
analog-to-digital
(A/D)
additional
external
capacitance
recommended to improve A/D linearity. A high-speed
amplifier
such
as
the
susceptible to decreased stability and closed-loop
response peaking when a capacitive load is placed
The
(8nV/
√
Hz), and the two input-referred current noise
terms (1.4pA/
√
Hz), combine to give low output noise
under
a
wide
variety
Figure 35
shows the op amp noise analysis model
with all the noise terms included. In this model, all
noise terms are taken to be noise voltage or current
density terms in either nV/
√
Hz or pA/
√
Hz.
OPA2652
input-referred
voltage
noise
converter—including
that
of
operating
conditions.
may
be
OPA2652
can
be
very
14
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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(yùn)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(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
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(yùn)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(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
OPA2658U 功能描述:高速運(yùn)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(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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