LTC2983
1
2983fc
For more information www.linear.com/LTC2983
TYPICAL APPLICATION
FEATURES DESCRIPTION
Multi-Sensor High Accuracy
Digital Temperature
Measurement System
The LTC
®
2983 measures a wide variety of temperature
sensors and digitally outputs the result, in °C or °F, with
0.1°C accuracy and 0.001°C resolution. The LTC2983 can
measure the temperature of virtually all standard (type B,
E, J, K, N, S, R, T) or custom thermocouples, automatically
compensate for cold junction temperatures and linearize
the results. The device can also measure temperature with
standard 2-, 3- or 4-wire RTDs, thermistors and diodes. It
has 20 reconfigurable analog inputs enabling many sen-
sor connections and configuration options. The LTC2983
includes excitation current sources and fault detection
circuitry appropriate for each type of temperature sensor.
The LTC2983 allows direct interfacing to ground referenced
sensors without the need for level shifters, negative supply
voltages, or external amplifiers. All signals are buffered and
simultaneously digitized with three high accuracy, 24-bit ∆∑
ADCs, driven by an internal 15ppm/°C (maximum) reference.
Thermocouple Measurement with Automatic Cold Junction Compensation
Typical Temperature Error Contribution
APPLICATIONS
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Patents Pending
n
Directly Digitize RTDs, Thermocouples, Thermistors
and Diodes
n
Single 2.85V to 5.25V Supply
n
Results Reported in °C or °F
n
20 Flexible Inputs Allow Interchanging Sensors
n
Automatic Thermocouple Cold Junction Compensation
n
Built-In Standard and User-Programmable Coefficients
for Thermocouples, RTDs and Thermistors
n
Configurable 2-, 3- or 4-Wire RTD Configurations
n
Measures Negative Thermocouple Voltages
n
Automatic Burn Out, Short-Circuit and Fault Detection
n
Buffered Inputs Allow External Protection
n
Simultaneous 50Hz/60Hz Rejection
n
Includes 15ppm/°C (Max) Reference (I-Grade)
n
Direct Thermocouple Measurements
n
Direct RTD Measurements
n
Direct Thermistor Measurements
n
Custom Sensor Applications
2983 TA01a
°C/°F
V
REF
(10ppm/°C)
LTC2983
24-BIT
∆∑ ADC
24-BIT
∆∑ ADC
24-BIT
∆∑ ADC
R
SENSE
2k
1
4
2
3
0.1µF
2.85V TO 5.25V
1k
1k
PT-100
RTD
LINEARIZATION/
FAULT DETECTION
SPI
INTERFACE
TEMPERATURE (°C)
–200
–0.5
ERROR (°C)
0.3
0.2
0.1
–0.1
–0.2
–0.3
–0.4
0.5
200
600
800
2983 TA01b
0
0.4
0
400
1000
14001200
THERMISTOR
THERMOCOUPLE
RTD
3904 DIODE
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