Datenblatt-Suchmaschine für elektronische Bauteile |
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LF441ACN Datenblatt(PDF) 8 Page - Texas Instruments |
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LF441ACN Datenblatt(HTML) 8 Page - Texas Instruments |
8 / 12 page 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 g3V Supply voltages less than these may degrade the common-mode rejection and restrict the output voltage swing The amplifier will drive a 10 kX load resistance to g10V 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 TLH9297 – 13 7 |
Ähnliche Teilenummer - LF441ACN |
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Ähnliche Beschreibung - LF441ACN |
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