Linear Technology LTC2983 - Page 13

LTC2983
13
2983fc
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OVERVIEW
Table 1. LTC2983 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 • 0.10% + 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, R
SENSE
= 1kΩ
Platinum RTD - PT-100, R
SENSE
= 2kΩ
Platinum RTD - PT-500, R
SENSE
= 2kΩ
Platinum RTD - PT-1000, R
SENSE
= 2kΩ
–200°C to 800°C
–200°C to 800°C
–200°C to 800°C
–200°C to 800°C
±0.1°C
±0.1°C
±0.1°C
±0.1°C
±0.05°C
±0.05°C
±0.02°C
±0.01°C
Thermistor, R
SENSE
= 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 for I-grade parts. 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 be combined with the errors for a
given thermocouple for total temperature measurement
accuracy.