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AMS285-1.2CN Datasheet(PDF) 5 Page - Advanced Monolithic Systems |
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AMS285-1.2CN Datasheet(HTML) 5 Page - Advanced Monolithic Systems |
5 / 8 page Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS285-1.2/AMS385-1.2 TYPICAL APPLICATIONS (Continued) Micropower Thermocouple Cold Junction Compensator + LM334 AMS385-1.2 R1 R2 ZERO ADJ 100k 1M 1% 5.1k 2k 1% TC ADJ 500 METER MERCURY CELL 1.345V + - V+ V- R THERMOCOUPLE + - COLD JUNCTION ISO THERMAL WITH LM334 Adjustment Procedure 1. Adjust TC ADJ pot until voltage across R1 equals Kelvin temperature multiplied by the thermocouple Seebeck coefficient. 2. Adjust ZERO ADJ pot until voltage across R2 equals the thermocouple Seebeck coefficient multiplied by 273.2. Thermocouple Seebeck R1 R2 Voltage Voltage Type Coefficient ( Ω Ω) ( Ω Ω) Across R1 Across R2 (mV/ °°C) @ 25 °°C (mV) (mV) J 52.3 523 1.24k 15.60 14.32 T 42.8 432 1k 12.77 11.78 K 40.8 408 953 Ω 12.17 11.17 S 6.4 63.4 150 Ω 1.908 1.766 Typical supply current 50 µA Precision 1 µµA to 1mA Current Sources 7 4 3 2 + - LM312 6 AMS385-1.2 R2 R1 100k -30V -1.5V TO -27V C1 150pF I OUT* *IOUT =1.23V/R2 7 4 3 2 + - LM312 6 R2 R1 100k 30V 1.5V TO 27V C1 150pF I OUT* AMS385-1.2 |
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