AN-225IC Temperature Sensor Provides …
ApplicationReportSNOA663B April1979 ,thesecircuitsareaccurateto C overa 0 C to70 C temperaturerangeusingJ orK ,a thermocoupleamplifierusinganLM335forcold -junctioncompensationhasbeendescribedfor whichworstcaseerrorcanbeaslowas1 Cper40 Cchangein (a) (b) Thermocouple( C/ V)....................72LinearApproximat ionstoTypeS April1979 RevisedApril2013AN-225ICTemperatureSenso rProvidesThermocoupleCold-JunctionCompen sationSubmitDocumentationFeedbackCopyrig ht 1979 2013, ,thermocouplesarestilla thermocoupleis madebyjoiningwiresoftwodifferentmetalsas shownin Figure1. Theoutputvoltageis knownastheSeebeckcoefficientandrangesfro m5 V/ C to50 V/ C (TM TREF) thermocoupleis sensitivetoa temperaturedifference, thetemperatureatthereferencejunctionmust beknownin ordertomakea tokeepthereferencejunctionin C, moreconvenientapproach,knownascold-junct ioncompensation,is toadda compensatingvoltagetothethermocoupleoutp utsothatthereferencejunctionappearstobea t0 thisvoltageis madeproportionaltotemperaturewi
Circuit Description www.ti.com Standard metal-filmresistors cost substantially less than precision types and may be substituted with a reduction in accuracy or …
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