LT1025 Datasheet | Linear Technology

Micropower Thermocouple Cold Junction pensator UW U Features s 80µA Supply Current s 4V to 36V Operation s 0.5°C Initial Accuracy (A Version) s patible with Standard Thermocouples (E, J, K, R, S, T) s Auxiliary 10m V/°C Output s Available in 8-Lead PDIP and SO Packages U APPLICATIO S s Thermocouple Cold Junction pensator s Centigrade Thermometer s Temperature pensation Network DESCRIPTIO The LT®1025 is a micropower thermocouple cold junction pensator for use with type E, J, K, R, S, and T thermocouples. It utilizes wafer level and post-package trimming to achieve 0.5°C initial accuracy. Special curvature correction circuitry is used to match the “bow” found in all thermocouples so that accurate cold junction pensation is maintained over a wider temperature range. The LT1025 will operate with a supply voltage from 4V to 36V. Typical supply current is 80µA, resulting in less than 0.1°C internal temperature rise for supply voltages under 10V. A 10m V/°C output is available at low impedance, in addition to the direct thermocouple voltages of 60.9µV/°C (E), 51.7µV/°C (J), 40.3µV/°C (K, T) and 5.95µV/°C (R, S). All outputs are essentially independent of power supply voltage. A special kit is available (LTK001) which contains an LT1025 and a custom tailored thermocouple amplifier. The amplifier and pensator are matched to allow a much tighter specification of temperature error than would be obtained by adding the pensator and amplifier errors on a worst-case basis. The amplifier from this kit is available separately as LTKA0x. The LT1025 is available in either an 8-pin PDIP or 8-pin SO package for temperatures between 0°C and 70°C. , LTC and LT are registered trademarks of Linear Technology Corporation. BLOCK DIAGRA BOW- CORRECTION VOLTAGE E 60.9µV/°C VIN + BUFFER - J 51.7µV/°C K,T 40.6µV/°C R, S 6µV/°C 10m V/°C TEMPERATURE SENSOR R- MON V0 10m V/°C - CORRECTS FOR BOW IN COLD JUNCTION, NOT IN PROBE (HOT JUNCTION) -...