MAX31855RASA+T Maxim Integrated, MAX31855RASA+T Datasheet - Page 11

• Manufacturer Part Number: MAX31855RASA+T
• Description: Data Conversion ICs - Various Thermocouple To Digital Converter
• Manufacturer: Maxim Integrated
• Series: MAX31855r

Specifications of MAX31855RASA+T

• Part # Aliases: 90-31855+RTR

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 V
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.
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.
Maxim Integrated
Applications Information
CC
Thermal Considerations
pin of the device and to GND.
Noise Considerations
Thermocouple-to-Digital Converter
Cold-Junction Compensated
The thermocouple system’s accuracy can also be
improved by following these precautions:
• Use the largest wire possible that does not shunt heat
• If a small wire is required, use it only in the region
• Avoid mechanical stress and vibration, which could
• When using long thermocouple wires, use a twisted
• Avoid steep temperature gradients.
• Try to use the thermocouple wire well within its tem-
• Use the proper sheathing material in hostile environ-
• Use extension wire only at low temperatures and only
• Keep an event log and a continuous record of thermo-
away from the measurement area.
of the measurement, and use extension wire for the
region with no temperature gradient.
strain the wires.
pair extension wire.
perature rating.
ments to protect the thermocouple wire.
in regions of small gradients.
couple resistance.
MAX31855
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