Texas Instruments LF156 Handleiding

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SNOSBH0D–MAY2000–REVISEDNOVEMBER2015

LFx5xJFETInputOperationalAmplifiers

1Features2Applications

1

•Advantages

•PrecisionHigh-SpeedIntegrators

•FastD/AandA/DConverters

–ReplaceExpensiveHybridandModuleFET

OpAmps

•HighImpedanceBuffers

–RuggedJFETsAllowBlow-OutFreeHandling

•Wideband,LowNoise,LowDriftAmplifiers

ComparedWithMOSFETInputDevices

•LogarithmicAmplifiers

–ExcellentforLowNoiseApplicationsUsing

•PhotocellAmplifiers

EitherHighorLowSourceImpedance—Very

•SampleandHoldCircuits

Low1/fCorner

–OffsetAdjustDoesNotDegradeDriftor

3Description

Common-ModeRejectionasinMost

TheLFx5xdevicesarethefirstmonolithicJFETinput

MonolithicAmplifiers

operationalamplifierstoincorporatewell-matched,

–NewOutputStageAllowsUseofLarge

high-voltageJFETsonthesamechipwithstandard

bipolartransistors(BI-FET™Technology).These

CapacitiveLoads(5,000pF)WithoutStability

amplifiersfeaturelowinputbiasandoffset

Problems

currents/lowoffsetvoltageandoffsetvoltagedrift,

–InternalCompensationandLargeDifferential

coupledwithoffsetadjust,whichdoesnotdegrade

InputVoltageCapability

driftorcommon-moderejection.Thedevicesarealso

•CommonFeatures

designedforhighslewrate,widebandwidth,

extremelyfastsettlingtime,lowvoltageandcurrent

–LowInputBiasCurrent:30pA

noiseandalow1/fnoisecorner.

–LowInputOffsetCurrent:3pA

–HighInputImpedance:10

12

Ω

DeviceInformation

(1)

–LowInputNoiseCurrent:0.01pA/√Hz

PARTNUMBERPACKAGEBODYSIZE(NOM)

–HighCommon-ModeRejectionRatio:100dBSOIC(8)4.90mm×3.91mm

LFx5xTO-CAN(8)9.08mm×9.08mm

–LargeDCVoltageGain:106dB

PDIP(8)9.81mm×6.35mm

•UncommonFeatures

(1)Forallavailablepackages,seetheorderableaddendumat

–ExtremelyFastSettlingTimeto0.01%:

theendofthedatasheet.

–4μsfortheLFx55devices

–1.5μsfortheLFx56

SimplifiedSchematic

–1.5μsfortheLFx57(A

V

=5)

–FastSlewRate:

–5V/µsfortheLFx55

–12V/µsfortheLFx56

–50V/µsfortheLFx57(A

V

=5)

–WideGainBandwidth:

–2.5MHzfortheLFx55devices

–5MHzfortheLFx56

–20MHzfortheLFx57(A

V

=5)

–LowInputNoiseVoltage:

–20nV/√HzfortheLFx55

3pFinLF357series

–12nV/√HzfortheLFx56

–12nV/√HzfortheLFx57(A

V

=5)

1

AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

Product specificaties