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)： 16/20頁
文件大?。?/td> 297K
代理商： OPA2652U2K5
www.ti.com
BOARD LAYOUT GUIDELINES
Achieving
optimum
high-frequency amplifier such as the OPA2652
requires careful attention to board layout parasitics
and external component types. Recommendations
that will optimize performance include:
1/2
OPA2652
V
V
O
I
R
R
F
G
=
= 2
-
R
F
1k
W
±
200mV Output Adjustment
Supply Decoupling
Not Shown
5k
W
5k
W
328
W
0.1 F
R
G
500
W
V
I
20k
W
10k
W
0.1 F
-
5V
+5V
+5V
-
5V
V
O
Thermal Analysis
OPA2652
SBOS125A–JUNE 2000–REVISED MAY 2006
This
specified maximum junction temperature. Actual P
will almost always be less than that considered here.
Carefully consider maximum T
J
in your application.
absolute
worst-case
condition
meets
the
performance
with
a
a) Minimize parasitic capacitance
to any AC
ground for all of the signal I/O pins. Parasitic
capacitance on the output and inverting input pins
can cause instability: on the noninverting input, it can
react
with
the
source
unintentional
bandlimiting.
capacitance, a window around the signal I/O pins
should be opened in all of the ground and power
planes around those pins. Otherwise, ground and
power planes should be unbroken elsewhere on the
board.
impedance
To
reduce
to
unwanted
cause
Figure 36. DC-Coupled, Inverting Gain of –2, with
Offset Adjustment
b) Minimize the distance
(< 0.25") from the
power-supply
pins
to
decoupling capacitors. At the device pins, the ground
and power plane layout should not be in close
proximity to the signal I/O pins. Avoid narrow power
and ground traces to minimize inductance between
the
pins
and
the
decoupling
power-supply
connections
decoupled with these capacitors. An optional supply
decoupling capacitor (0.1
μ
F) across the two power
supplies (for bipolar operation) will improve 2nd
harmonic distortion performance. Larger (2.2
μ
F to
6.8
μ
F) decoupling capacitors, effective at lower
frequency, should also be used on the main supply
pins. These capacitors may be placed somewhat
farther from the device and may be shared among
several devices in the same area of the PCB.
Heatsinking or forced airflow may be required under
extreme operating conditions. Maximum desired
junction temperature will set the maximum allowed
internal power dissipation as described below. In no
case should the maximum junction temperature be
allowed to exceed 175
°
C.
Operating junction temperature (T
J
) is given by T
A
+
P
θ
. The total internal power dissipation (P
) is
the sum of quiescent power (P
DQ
) and additional
power dissipated in the output stage (P
DL
) to deliver
load power. Quiescent power is simply the specified
no-load supply current times the total supply voltage
across the part. P
DL
depends on the required output
signal and load; for a grounded resistive load, P
is
at a maximum when the output is fixed at a voltage
equal to 1/2 of either supply voltage (for equal
bipolar
supplies).
Under
V
S2
/(4
R
L
) where R
L
includes feedback network
loading.
high-frequency
0.1
μ
F
capacitors.
should
The
be
always
this
condition,
P
=
c) Careful selection and placement of external
components will preserve the high frequency
performance of the OPA2652.
Resistors should be
a very low reactance type. Surface-mount resistors
work best and allow a tighter overall layout. Metal
film or carbon composition axiallyleaded resistors
can also provide good high frequency performance.
Again, keep resistor leads and PCB traces as short
as possible. Never use wirewound 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
Note that it is the power in the output stage, and not
into
the
load,
that
determines
dissipation.
internal
power
As an example, compute the maximum T
using an
OPA2652E (SOT23-8 package) in the circuit of
Figure 28
operating at the maximum specified
ambient temperature of +85
°
C and with both outputs
driving 2.5V
DC
into a grounded 100
load.
P
D
= 10V
15.5mA + 2 [5
2
/(4
[100
804
])] =
296mW
Maximum T
J
= +85
°
C + (0.30W
150
°
C/W) = 130
°
C
16
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相關代理商/技術參數(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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
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