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Lflflf lflflf lflflf - Datasheet Notes : 1. Unless otherwise specified the absolute maximum negative input voltage is equal to the negative power supply voltage. The temperature coefficient of the adjusted input offset voltage changes only a small amount 0.
Common-mode rejection and open loop voltage gain are alsounaffected by. The input bias currents are junction leakage currents which approximately double for every 10 o C increase in the junction. Due to limited production test time, the input bias current measured is correlated to junction temperature.
In a normal operation the junction temperature rises above the ambient temperature as a result of internal power dissipation,. Use of a heatsink is recommended.
Supply voltage rejection is measured for both supply magnitudes increasing or decreasing simultaneously, in accordance with. It is the time. Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the.
No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. This publication supersedes and replaces all information. STMicroelectronics products are not authorized for use as critical components in life support. This amplifiers feature low input bias and offset currents, low input offset voltage and input offset voltage drift,coupledwith offsetadjustwhich doesnotdegrade drift or common-mode rejection.
Common-mode rejection and open loop voltage gain are alsounaffected by offset adjustment. The input bias currents are junction leakage currents which approximately double for every 10 o C increase in the junction temperature T amb. Use of a heatsink is recommended f input currents are to be kept to a minimum. Supply voltage rejection is measured for both supply magnitudes increasing or decreasing simultaneously, in accordance with common practise. It is the time required for the error voltage the voltage at the inverting input pin on the amplifier to settle to within 0.
TheseJFETs havelarge reverse breakdown voltagesfromgatetosource or drain eliminatingtheneed of clamps acrossthe inputs. Therefore large differential input voltages can easily be accommodatedwithoutalarge increaseof inputcurrents. The maximum differential input voltage is independent of the supplyvoltage. However, neitherof thenegativeinput voltagesshouldbe allowed to exceedthe negative supply as this will cause large currents to flow which can result in a destroyed unit.
Exceeding the negative common-modelimit on either inputwill causeareversal of thephasetotheoutputandforce the amplifier output to the correspondinghigh or lowstate. Exceedingthe negativecommon-mode limit on bothinputs will force the amplifier outputto a highstate. In neithercasedoes a latch occur since raising the input back within the common-mode range again puts the input stage and thustheamplifierin a normal operatingmode.
Exceedingthepositive common-modelimit on asingle inputwill not changethephase of the output however, if bothinputsexceedthe limit, theoutput of theamplifier will be forcedto ahighstate. Theseamplifierswill operatewith the common-mode input voltage equal to the positive supply. In fact, the common-modevoltagecanexceedthepositivesupplyby approximatelymV independentof supply volt-age and over thefull operatingtemperaturerange. Precautionsshouldbe taken to ensurethat thepowersupplyforthe integrated circuit never becomes re-versed in polarity or that the unit is not inadvertentlyin-stalledbackwards in a socket as an unilimited current surge throughthe resulting forward diode within the IC couldcausefusingoftheinternalconductorsandresultin a destroyedunit.
Allof thebiascurrentsintheseamplifiersareset byFET current sources. The drain currents for the amplifiers are therefore essentially independent of supply voltages. As with most amplifiers, care should betakenwith lead dress, componentsplacement and supply decoupling in order to ensure stability. A feedback pole is createdwhen the feedbackaround any amplifier is resistive. The parallel resistance and capacitancefromthe input of thedevice usuallythe invertinginput toacgroundsetthefrequencyofthepole.
In many instances the frequency of this pole is much greaterthanthe expected3 dBfrequencyof the closed loopgain and consequentlythereisnegligible effect on stability margin. However, if the feedback pole is less than approximately six time the expected 3 dB frequencyaleadcapacitor should be placed from the outputto the inputof the op amp.
The value of that added capacitorshould 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. TBL Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use.
Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. Datasheet Catalog. Short-link Link Embed.
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Lf155-lf255-lf355 lf156-lf256-lf356 lf157-lf257-lf357 - Datasheet ...
LF357 AMPLIFIERS. Datasheet pdf. Equivalent