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LF351-N bảng dữ liệu(PDF) 8 Page - Texas Instruments

tên linh kiện LF351-N
Giải thích chi tiết về linh kiện  LF351 Wide Bandwidth JFET Input Operational Amplifier
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Pulse Response (Continued)
Application Hints
The LF351 is an op amp with an internally trimmed input off-
set 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, 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 will 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 LF351 is biased by a zener reference which allows nor-
mal circuit operation on ±4V power supplies. Supply volt-
ages less than these may result in lower gain bandwidth and
slew rate.
The LF351 will drivea2k
Ω load resistance to ±10V over the
full temperature range of 0˚C to +70˚C. 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
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 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.
Current Limit (R
L=100Ω)
DS005648-8
7
www.national.com
PrintDate=1998/04/07 PrintTime=13:52:35 38265 ds005648 Rev. No. 3
cmserv
Proof
7


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