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MAX31855TASA+ Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX31855TASA+ Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 13 page ���������������������������������������������������������������� Maxim Integrated Products 11 MAX31855 Cold-Junction Compensated Thermocouple-to-Digital Converter Applications Information Noise Considerations Because of the small signal levels involved, thermocou- ple temperature measurement is susceptible to power- supply coupled noise. The effects of power-supply noise can be minimized by placing a 0.1FF ceramic bypass capacitor close to the VCC pin of the device and to GND. The input amplifier is a low-noise amplifier designed to enable high-precision input sensing. Keep the thermo- couple and connecting wires away from electrical noise sources. It is strongly recommended to add a 10nF ceramic surface-mount differential capacitor, placed across the T+ and T- pins, in order to filter noise on the thermocouple lines. Thermal Considerations Self-heating degrades the device’s temperature measure- ment accuracy in some applications. The magnitude of the temperature errors depends on the thermal conductivity of the device package, the mounting technique, and the effects of airflow. Use a large ground plane to improve the device’s temperature measurement accuracy. The thermocouple system’s accuracy can also be improved by following these precautions: • Usethelargestwirepossiblethatdoesnotshuntheat away from the measurement area. • If a small wire is required, use it only in the region of the measurement, and use extension wire for the region with no temperature gradient. • Avoid mechanical stress and vibration, which could strain the wires. • When using long thermocouple wires, use a twisted pair extension wire. • Avoidsteeptemperaturegradients. • Trytousethethermocouplewirewellwithinitstem- perature rating. • Usethepropersheathingmaterialinhostileenviron- ments to protect the thermocouple wire. • Useextensionwireonlyatlowtemperaturesandonly in regions of small gradients. • Keepaneventlogandacontinuousrecordofthermo- couple resistance. |
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