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參數(shù)資料
| 型號(hào)： | LF441CJ |
| 英文描述： | Voltage-Feedback Operational Amplifier |
| 中文描述： | 電壓反饋運(yùn)算放大器 |
| 文件頁(yè)數(shù)： | 7/10頁(yè) |
| 文件大?。?/td> | 234K |
| 代理商： | LF441CJ |
Application Hints
This device is a low power op amp with an internally
trimmed input offset voltage and JFET input devices
(BI-FET II). These JFETs have large reverse breakdown
voltages from gate to source and drain, eliminating the need
for clamps across the inputs. Therefore, large differential
input voltages can easily be accommodated without a large
increase in input current. The maximum differential input
voltage is independent of the supply voltages. However, nei-
ther of the input voltages should be allowed to exceed the
negative supply as this will cause large currents to flow
which can result in a destroyed unit.
Exceeding the negative common-mode limit on either input
will force the output to a high state, potentially causing a
reversal of phase to the output. Exceeding the negative
common-mode limit on both inputs will force the amplifier
output to a high state. In neither case does a latch occur
since raising the input back within the common-mode range
again puts the input stage and thus the amplifier in a normal
operating mode.
Exceeding the positive common-mode limit on a single input
will not change the phase of the output; however, if both
inputs exceed the limit, the output of the amplifier will be
forced to a high state.
The amplifier will operate with a common-mode input volt-
age equal to the positive supply; however, the gain band-
width and slew rate may be decreased in this condition.
When the negative common-mode voltage swings to within
3V of the negative supply, an increase in input offset voltage
may occur.
The amplifier is biased to allow normal circuit operation with
power supplies of
g
3V. Supply voltages less than these
may degrade the common-mode rejection and restrict the
output voltage swing.
The amplifier will drive a 10 k
X
load resistance to
g
10V
over the full temperature range.
Precautions should be taken to ensure that the power sup-
ply for the integrated circuit never becomes reversed in po-
larity or that the unit is not inadvertently installed backwards
in a socket, as an unlimited current surge through the result-
ing forward diode within the IC could cause fusing of the
internal conductors and result in a destroyed unit.
As with most amplifiers, care should be taken with lead
dress, component placement and supply decoupling in or-
der to ensure stability. For example, resistors from the out-
put to an input should be placed with the body close to the
input to minimize ‘‘pick-up’’ and maximize the frequency of
the feedback pole by minimizing the capacitance from the
input to ground.
A feedback pole is created when the feedback around any
amplifier is resistive. The parallel resistance and capaci-
tance from the input of the device (usually the inverting input
to AC ground) set the frequency of this pole. In many in-
stances the frequency of this pole is much greater than the
expected 3 dB frequency, of the closed loop gain and con-
sequently there is negligible effect on stability margin. How-
ever, if the feedback pole is less than approximately 6 times
the expected 3 dB frequency, a lead capacitor should be
placed from the output to the input of the op amp. The value
of the added capacitor should be such that the RC time
constant of this capacitor and the resistance it parallels is
greater than or equal to the original feedback pole time con-
stant.
Detailed Schematic
TL/H/9297–13
7
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| LF441CD | LOW POWER JFET INPUT OPERATIONAL AMPLIFIERS |
| LF441CN | LOW POWER JFET INPUT OPERATIONAL AMPLIFIERS |
| LF457CIH | Voltage-Feedback Operational Amplifier |
| LF457H | Voltage-Feedback Operational Amplifier |
| LF457N | Voltage-Feedback Operational Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LF441CJ/A+ | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:Voltage-Feedback Operational Amplifier |
| LF441CM | 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:LF441 Low Power JFET Input Operational Amplifier |
| LF441CN | 制造商:ONSEMI 制造商全稱(chēng):ON Semiconductor 功能描述:LOW POWER JFET INPUT OPERATIONAL AMPLIFIERS |
| LF441CN/A+ | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:Voltage-Feedback Operational Amplifier |
| LF441CN/B+ | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:Voltage-Feedback Operational Amplifier |
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