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LF411ACH 数据表(PDF) 7 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部件名 LF411ACH
功能描述  Low Offset, Low Drift JFET Input Operational Amplifier
Download  12 Pages
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

LF411ACH 数据表(HTML) 7 Page - National Semiconductor (TI)

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Pulse Response R
L=2kΩ,CL10 pF (Continued)
Application Hints
The LF411 series of internally trimmed JFET input op amps
( BI-FET II) provide very low input offset voltage and guar-
anteed input offset voltage drift. These JFETs have large re-
verse 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 dif-
ferential input voltage is independent of the supply voltages.
However, neither 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 re-
versal 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 in-
puts exceed the limit, the output of the amplifier may be
forced to a high state.
The amplifier will operate with a common-mode input voltage
equal to the positive supply; however, the gain bandwidth
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 oc-
cur.
The LF411 is biased by a zener reference which allows nor-
mal circuit operation on ±4.5V power supplies. Supply volt-
ages less than these may result in lower gain bandwidth and
slew rate.
The LF411 will drivea2k
Ω 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
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) to AC
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
feedback pole is less than approximately 6 times the ex-
pected 3 dB frequency, a lead capacitor should be placed
Large Signal Inverting
DS005655-41
Large Signal Non-Inverting
DS005655-42
Current Limit (R
L=100Ω)
DS005655-43
www.national.com
7


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