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參數(shù)資料
| 型號： | LF253N |
| 元件分類： | 運算放大器 |
| 英文描述： | Voltage-Feedback Operational Amplifier |
| 中文描述： | 電壓反饋運算放大器 |
| 文件頁數(shù)： | 8/14頁 |
| 文件大小： | 597K |
| 代理商： | LF253N |
Application Hints
(Continued)
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 amplifiers 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.
Each amplifier is individually biased by a zener reference
which allows normal circuit operation on
±
6V power sup-
plies. Supply voltages less than these may result in lower
gain bandwidth and slew rate.
The amplifiers will drive a 2 k
load resistance to
±
10V over
the full temperature range of 0C to +70C. If the amplifier is
forced to drive heavier load currents, however, an increase
in input offset voltage may occur on the negative voltage
swing and finally reach an active current limit on both posi-
tive and negative swings.
Precautions should be taken to ensure that the power supply
for the integrated circuit never becomes reversed in polarity
Detailed Schematic
or that the unit is not inadvertently installed backwards in a
socket as an unlimited current surge through the resulting
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 order
to ensure stability. For example, resistors from the output to
an input should be placed with the body close to the input to
minimize “pick-up” and maximize the frequency of the feed-
back 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 capacitance
from the input of the device (usually the inverting input) toAC
ground set the frequency of the pole. In many instances the
frequency of this pole is much greater than the expected 3
dB frequency of the closed loop gain and consequently there
is negligible effect on stability margin. However, if the feed-
back 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 constant.
00564909
L
www.national.com
8
相關PDF資料 |
PDF描述 |
|---|---|
| LF353DT | Voltage-Feedback Operational Amplifier |
| LF353D-TR | Voltage-Feedback Operational Amplifier |
| LF353J | Voltage-Feedback Operational Amplifier |
| LF353JG | Voltage-Feedback Operational Amplifier |
| LF353ND | Voltage-Feedback Operational Amplifier |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LF255 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:WIDE BANDWIDTH SINGLE J-FET OPERATIONAL AMPLIFIERS |
| LF255D | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:WIDE BANDWIDTH SINGLE J-FET OPERATIONAL AMPLIFIERS |
| LF255H | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Series Monolithic JFET Input Operational Amplifiers |
| LF255M | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
| LF255N | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:WIDE BANDWIDTH SINGLE J-FET OPERATIONAL AMPLIFIERS |
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