LTC2984 datasheet(14/78 Pages) AD

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LTC2984

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OVERVIEW

Table 1. LTC2984 Error Contribution and Peak Noise Errors

SENSOR TYPE

TEMPERATURE RANGE

ERROR CONTRIBUTION

PEAK-TO-PEAK NOISE

Type K Thermocouple

–200°C to 0°C

0°C to 1372°C

±(Temperature • 0.23% + 0.05)°C

±(Temperature • 0.12% + 0.05)°C

±0.08°C

Type J Thermocouple

–210°C to 0°C

0°C to 1200°C

±(Temperature • 0.23% + 0.05)°C

±(Temperature • 0.12% + 0.05)°C

±0.07°C

Type E Thermocouple

–200°C to 0°C

0°C to 1000°C

±(Temperature • 0.18% + 0.05)°C

±(Temperature • 0.10% + 0.05)°C

±0.06°C

Type N Thermocouple

–200°C to 0°C

0°C to 1300°C

±(Temperature • 0.27% + 0.08)°C

±(Temperature • 0.10% + 0.08)°C

±0.13°C

Type R Thermocouple

0°C to 1768°C

±(Temperature • 0.10% + 0.4)°C

±0.62°C

Type S Thermocouple

0°C to 1768°C

±(Temperature • 0.10% + 0.4)°C

±0.62°C

Type B Thermocouple

400°C to 1820°C

±(Temperature • 0.10%)°C

±0.83°C

Type T Thermocouple

–250°C to 0°C

0°C to 400°C

±(Temperature • 0.15% + 0.05)°C

±(Temperature • 0.10% + 0.05)°C

±0.09°C

External Diode (2 Reading)

–40°C to 85°C

±0.25°C

±0.05°C

External Diode (3 Reading)

–40°C to 85°C

±0.25°C

±0.2°C

Platinum RTD – PT-10, RSENSE = 1kΩ

Platinum RTD – PT-100, RSENSE = 2kΩ

Platinum RTD – PT-500, RSENSE = 2kΩ

Platinum RTD – PT-1000, RSENSE = 2kΩ

–200°C to 800°C

±0.1°C

±0.05°C

±0.02°C

±0.01°C

Thermistor, RSENSE = 10kΩ

–40°C to 85°C

±0.1°C

±0.01°C

Table 1 shows the estimated system accuracy and noise

associated with specific temperature sensing devices.

System accuracy and peak-to-peak noise include the

effects of the ADC, internal amplifiers, excitation current

sources, and integrated reference. Accuracy and noise

are the worst-case errors calculated from the guaranteed

maximum ADC and reference specifications. Peak-to-

peak noise values are calculated at 0°C (except type B

was calculated at 400°C) and diode measurements use

AVG = ON mode.

Thermocouple errors do not include the errors associated

with the cold junction measurement. Errors associated

with a specific cold junction sensor within the operating

temperature range can combined with the errors for a

given thermocouple for total temperature measurement

accuracy.

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