Texas Instruments LMP91050 Handleiding

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LMP91050

IN

10 nF

Thermopile

10 µF

160 k

160 k

6.8 nF

OUT

û ADC

10 µF10 nF

CSB

SDIO

1 kO

1 µF

SCLK

10 nF

A0A1

GND

VDD

VDD

CMOUT

CMOUT

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

LMP91050

SNAS517E–NOVEMBER2011–REVISEDSEPTEMBER2015

LMP91050ConfigurableAFEforNondispersiveInfrared(NDIR)SensingApplications

1Features3Description

TheLMP91050deviceisaprogrammableintegrated

1

•ProgrammableGainAmplifier

SensorAnalogFrontEnd(AFE)optimizedfor

•DarkSignalOffsetCancellation

thermopilesensors,astypicallyusedinNDIR

•SupportsExternalFiltering

applications.Itprovidesacompletesignalpath

solutionbetweenasensorandmicrocontrollerthat

•Common-ModeGeneratorand8-BitDAC

generatesanoutputvoltageproportionaltothe

•KeySpecifications

thermopilevoltage.Theprogrammabilityofthe

–ProgrammableGain167to7986V/V

LMP91050enablesittosupportmultiplethermopile

sensorswithasingledesignasopposedtothe

–LowNoise(0.1to10Hz)0.1μVRMS

multiplediscretesolutions.

–GainDrift100ppm/°C(Maximum)

TheLMP91050featuresaprogrammablegain

–PhaseDelayDrift500ns(Maximum)

amplifier(PGA),darkphaseoffsetcancellation,and

–PowerSupplyVoltageRange2.7to5.5V

anadjustablecommon-modegenerator(1.15Vor

2.59V)whichincreasesoutputdynamicrange.The

2Applications

PGAoffersalow-gainrangeof167V/Vto1335V/V

plusahigh-gainrangeof1002V/Vto7986V/Vwhich

•NDIRSensing

enablestheusertousethermopileswithdifferent

•DemandControlVentilation

sensitivities.ThePGAishighlightedbylow-gaindrift

•BuildingMonitoring

(100ppm/°C),outputoffsetdrift(1.2mV/°CatG=

•CO2CabinControl—Automotive

1002V/V),phasedelaydrift(500ns)andnoise

specifications(0.1μV

RMS

0.1to10Hz).

•AlcoholDetection—Automotive

•IndustrialSafetyandSecurity

DeviceInformation

(1)

•GHGandFreonsDetectionPlatforms

PARTNUMBERPACKAGEBODYSIZE(NOM)

LMP91050VSSOP(10)3.00mm×3.00mm

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

TypicalApplicationCircuit

ConfigurableAFEforNDIR

1

AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

Product specificaties