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參數資料
| 型號： | LF147J |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運算放大器 |
| 英文描述： | Wide Bandwidth Quad JFET Input Operational Amplifiers |
| 中文描述： | QUAD OP-AMP, 8000 uV OFFSET-MAX, 4 MHz BAND WIDTH, CDIP14 |
| 封裝： | CERAMIC, DIP-14 |
| 文件頁數： | 8/13頁 |
| 文件大小： | 406K |
| 代理商： | LF147J |
Application Hints
(Continued)
Exceeding the positive common-mode limit on a single input
will not change the phase of the output; however, if both in-
puts 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
±
4.5V power sup-
plies. Supply voltages less than these may result in lower
gain bandwidth and slew rate.
The LF147 will drive a 2 k
load resistance to
±
10V over the
full temperature range. 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 positive 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 out-
put to the input of the op amp. The value of the added ca-
pacitor should be such that the RC time constant of this ca-
pacitor and the resistance it parallels is greater than or equal
to the original feedback pole time constant.
DS005647-9
www.national.com
8
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LF147J/883 | 制造商:Texas Instruments 功能描述:OP Amp Quad GP ±22V 14-Pin CDIP Rail 制造商:Texas Instruments 功能描述:OP AMP QUAD GP 22V 14CDIP - Rail/Tube |
| LF147J/883QS | 制造商:Texas Instruments 功能描述: |
| LF147JAN | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LF147JAN Wide Bandwidth Quad JFET Input Operational Amplifier |
| LF147J-SMD | 制造商:National Semiconductor Corporation 功能描述:OP Amp Quad GP |
| LF147-LF247 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:WIDE BANDWIDTH QUAD J-FET OPERATIONAL AMPLIFIERS |
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