LTK001 Thermocouple Cold Junction Compensator and Matched Amplifier thermocouple applications. It has low supply current to FEATURES minimize warmup drift, very low offset voltage (<35V), 0.75C Initial Accuracy (A Version) high gain, and extremely low input bias currents (< 600pA) Extremely Low Warmup Drift to allow high impedance input filters to be used without Preset Outputs for Type E, J, K, R, S, T degrading offset voltage or drift. Single 5V to 20V Operation Matching of the kits is accomplished by separating the 480A Typical Supply Current compensators and amplifiers according to the polarity of Available in 8-Pin DIP Package their initial (room temperature) errors. This eliminates the need to sum the errors of the two components to find the U APPLICATIO S worst-case error. The LTK001 has direct thermocouple outputs of Thermocouple Cold Junction Compensation 60.9V/C (E), 51.7V/C (J), 40.6V/C (K, T), and 5.95V/C (R, S). It also has a 10mV/C output which can DESCRIPTIO be scaled to match any arbitrary thermocouple. The LTK001 is a thermocouple amplifier supplied with a For multiple thermocouple applications using one com- matched cold junction compensator. By separating the pensator, amplifiers may be ordered separately (LTKA0x), amplifier and compensator functions, the problem of still matched to the compensator. compensator temperature rise is virtually eliminated. The , 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 compensator is a selected version of the LT 1025 cold applications circuits consult the LT1025 data sheet. junction compensator. The amplifier, which is also avail- able separately as LTKA0x has been specially selected for TYPICAL APPLICATIO Type K 10mV/C Thermometer R2 R3** 100 255k FULL-SCALE TRIM 1% C2 R1 0.1F 1k 1% + V + V V OUT LTKA0x V 10mV/C IN K + + * C1 LT1025 V 0.1F TYPE K V 0 GND R V R4* * , R4 IS NOT REQUIRED (OPEN) FOR R4 30A LT1025 TEMPERATURES 0C. **SELECTED FOR 0C100C RANGE LTK001 TA01 V 001fa 1 U ULTK001 ABSOLUTE AXI U RATI GS (Note 1) Both Devices Amplifier (LTKA0x) + Operating Temperature Range Supply Voltage (Total V to V ) ............................... 40V LTK001AMJ8, LTK001MJ8 (OBSOLETE) Differential Input Current (Note 2) ...................... 10mA ......................................................... 55C to 125C Common Mode Input Voltage ............. Equal to Supplies LTK001ACN8, LTK001CN8 ...................... 0C to 70C Output Short-Circuit Duration .......................... Indefinite Storage Temperature Range ................. 65C to 150C Compensator (LT1025) Lead Temperature Range (Soldering, 10 sec.)...... 300C Supply Voltage (V to Ground Pin) ......................... 36V IN Output Voltage (Forced) ............................................ 5V Output Short-Circuit Duration .......................... Indefinite UUW PACKAGE/ORDER I FOR ATIO TOP VIEW TOP VIEW V TRIM OS TOP VIEW J E V 8 OS 1 8 51.7V/C + 60.9V/C V TRIM 1 8 V TRIM V OS OS TRIM 1 7 K,T V IN 2 7 + 40.6V/C IN 2 V 7 V O + IN 2 6 OUT R,S 3 6 10mV/C +IN 3 6 OUT 6V/C R GND 4 5 5 OVER COMP +IN 3 V OVER COMP 4 5 COMMON 4 N8 PACKAGE V N8 PACKAGE 8-LEAD PDIP 8-LEAD PDIP AMPLIFIER H PACKAGE COMPENSATOR (LTKA0x) 8-LEAD TO-5 METAL CAN (LT1025) AMPLIFIER (LTKA0x) T = 100C, = 130C/W JMAX JA T = 100C, = 130C/W (N8) JMAX JA T = 150C, = 150C/W, = 45C/W JMAX JA JC ORDER PART NUMBER ORDER PART NUMBER ORDER PART NUMBER AMPLIFIER ONLY KIT AMPLIFIER ONLY (Note A) LTK001CN8 (Note A) LTKA00MH LTK001ACN8 LTKA00CN8 LTKA01MH LTKA01CN8 J8 PACKAGE 8-LEAD CERDIP COMPENSATOR (LT1025) T = 150C, = 100C/W (J8) JMAX JA LTK001MJ8 LTK001AMJ8 OBSOLETE PACKAGE OBSOLETE PACKAGE Consider the N8 Package for Alternate Source Note A: The polarity of the amplifier is indicated by the 0 or 1 in the part number. An LT1025 with a 0 identifier is properly matched with an LTKA00, while an LT1025 with a 1 identifier should be used with an LTKA01. Consult factory for parts specified with wider operating temperature ranges. 001fa 2 U WWW