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LT1025ACN8 Datasheet(PDF) 9 Page - Linear Technology |
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LT1025ACN8 Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page 9 LT1025 1025fb TYPICAL APPLICATIO S Type S Thermocouple Amplifier with Ultralow Offset and Drift † + – * TRIM R5 FOR VOUT = 1.669V AT VIN = 0.000mV (+INPUT OF AMPLIFIER GROUNDED) ** TRIM R2 FOR VOUT = 9.998V AT T = 1000°C, OR FOR VIN AT +INPUT OF AMPLIFIER = 9.585mV † THIS AMPLIFIER HAS A DELIBERATE OFFSET TO ALLOW OUTPUT SLOPE (10mV/ °C) TO BE SET INDEPENDENTLY FROM AN ARBITRARY HIGH TEMPERATURE CENTER POINT (1000 °C). THIS IS REQUIRED BECAUSE THE SLOPE OF TYPE “S” THERMOCOUPLES VARIES RAPIDLY WITH TEMPERATURE, INCREASING FROM 6 µV/°C AT 25°C to 11µV/°C AT 1000°C. NONLINEARITY LIMITS ACCURACY TO ≈3°C OVER THE 800°C TO 1200°C RANGE EVEN WITH OFFSET CORRECTION V + V + V – TYPE S R7 750k R6 12k –15V LT1009 2.5V R4 1.37M 1% R1 1k 1% R2** 100 Ω FULL-SCALE TRIM R3 909k 1% 0.1 µF 0.1 µF 1 4 8 6 7 3 5 2 R5* 10k OFFSET TRIM R4 2.7k 1 µF 0.1 µF 15V VOUT 10mV/ °C 800 °C TO 1200°C VIN VO LT1025 LT1052 GND R – R,S –+ LT1025 • TA06 |
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