LTK001 Datasheet | Linear Technology

Thermocouple Cold Junction pensator and Matched Amplifier Features - 0.75°C Initial Accuracy (A Version) - Extremely Low Warmup Drift - Preset Outputs for Type E, J, K, R, S, T - Single 5V to ±20V Operation - 480µA Typical Supply Current - Available in 8-Pin DIP Package U APPLICATIO S - Thermocouple Cold Junction pensation DESCRIPTIO The LTK001 is a thermocouple amplifier supplied with a matched cold junction pensator. By separating the amplifier and pensator functions, the problem of pensator temperature rise is virtually eliminated. The pensator is a selected version of the LT®1025 cold junction pensator. The amplifier, which is also available separately as LTKA0x has been specially selected for thermocouple applications. It has low supply current to minimize warmup drift, very low offset voltage (<35µV), high gain, and extremely low input bias currents (<600p A) to allow high impedance input filters to be used without degrading offset voltage or drift. Matching of the kits is acplished by separating the pensators and amplifiers according to the polarity of their initial (room temperature) errors. This eliminates the need to sum the errors of the two ponents to find the worst-case error. The LTK001 has direct thermocouple outputs of 60.9µV/°C (E), 51.7µV/°C (J), 40.6µV/°C (K, T), and 5.95µV/°C (R, S). It also has a 10m V/°C output which can be scaled to match any arbitrary thermocouple. For multiple thermocouple applications using one pensator, amplifiers may be ordered separately (LTKA0x), still matched to the pensator. , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. For typical performance curves and applications circuits consult the LT1025 data sheet. TYPICAL APPLICATIO Type K 10m V/°C Thermometer R2 R3- - 100Ω 255k FULL-SCALE TRIM 1% V+ VIN K LT1025 GND R- V0 R1 1k 1% - + - C1 0.1µF TYPE K C2...