Product Selector Card Datasheet by Analog Devices Inc.

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Temperature Sensor In. Benchtop Accuracy Error Contribution NDW pm ur ANALOG DEVICES LTLJflNfl
The LTC
®
2983, LTC2984, and LTC2986 are high accuracy digital temperature measurement systems that integrate all of the necessary
components to excite, calibrate, measure and digitize diodes, thermistors, thermocouples and RTDs (resistance temperature detectors).
Any combination of sensors connect directly to the ICs, with no other active components required. An SPI interface provides readout
of temperature in °C or °F and simple configuration of features such as automatic cold junction compensation, linearization coefficients
and fault detection. The LTC2984 and LTC2986-1 include EEPROM for storing channel configuration data and custom coefficients.
Features
n
Directly Digitizes 2-, 3-, 4-Wire RTDs, Thermocouples,
Thermistors and Diodes
n
On-Chip EEPROM Stores Channel Configuration Data
and Custom Coefficients (LTC2984 and LTC2986-1)
n
3V to 5V Supply Range
n
Up to 20 Flexible Inputs Allow Interchanging Sensors
without Hardware Modifications
n
Measures Negative Voltages and Ground-Referenced
Sensors without the Need of an Extra Supply or Level
Shift Circuitry
n
Buffered Inputs Allow External Protection and Filtering
without Droop Errors
n
Includes 15ppm/°C (Max) Reference, Switching
Networks, Current Sources, Three 24-Bit Δ∑ADCs,
RAM, ROM, and Sensor Linearization Circuitry
n
Built-In Standard or Programmable Coefficients
n
Simultaneous 50Hz/60Hz Rejection
n
Sleep Mode to Reduce Current Consumption to 25µA
n
Automatic Burn Out, Short-Circuit and Fault Detection
Any Temperature Sensor In. Benchtop Accuracy Out.
Multi-Sensor High Accuracy Digital
Temperature Measurement Systems
Error Contribution
Product Selection
LTC2983 LTC2984 LTC2986 LTC2986-1
Channel Count 20 20 10 10
EEPROM • •
Package 7mm x 7mm LQFP-48
Digitized
Temperature
Measurement
C or °F)
Thermocouple
RTD
Thermistor
Diode
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
0
0.4
0400 1000 14001200
THERMISTOR
THERMOCOUPLE
RTD
3904 DIODE
L, LT, LTC, LTM, µModule, Linduino, Linear Technology and the Linear logo are registered trademarks and
QuikEval is trademark of Analog Devices, Inc. All other trademarks are the property of their respective owners.
SINGLEENDED THERMocDuPLE SHARED caLD In. DIFFERENTIAL THERMocDuPLE SHARED R STANDARD R SHARED R erIRE RTD SVWIRE RTD CUSTDM R SINGLEENDED DIoDE DIFFERENTIAL DIoDE
SINGLE-ENDED
DIODE
DIFFERENTIAL
DIODE
SHARED RSENSE
4-WIRE RTD
3-WIRE RTD
SHARED RSENSE
STANDARD
THERMISTOR
CUSTOM
THERMISTOR
SINGLE-ENDED
THERMOCOUPLE
SHARED COLD
JUNCTION SENSOR
DIFFERENTIAL
THERMOCOUPLE
n
Single-Ended or Differential Measurements
n
Built-In Linearization NIST Coefficients for
Types J, K, E, N, R, S, T and B
n
Programmable Custom Coefficients Support
n
Automatic Cold Junction Compensation (CJC)
Using Shareable Diode, RTD or Thermistor
n
2-Wire Support for Simple Setups
n
3-Wire Support for Balanced Lead Resistance
Error Cancellation
n
4-Wire Support for Unbalanced Lead
Resistance Error Cancellation; Automatic
Rotation of RTD for Removal of Thermocouple
Effects
n
Shareable Sense Resistor for Multiple RTDs
or Thermistors
n
Built-In Linearization Coefficients for Types
PT-10, PT-50, PT-100, PT-200, PT-500,
PT-1000 and NI-120 with Selectable Common
Standards (385, 392, etc.)
n
Programmable Custom Coefficients Support
n
Programmable Excitation Current: 5µA – 1mA
n
Hi-Z Sensor and Sense Resistor Input
n
Single-Ended or Differential Measurements
n
Series Resistance Error Cancellation
n
Noise Reduction When Used as CJC Sensor
n
Programmable Excitation Current:
10µA – 640µA
n
Programmable Ideality Factor (η)
n
Single-Ended or Differential Measurements
n
Shareable Sense Resistor for Multiple
Thermistors or RTDs
n
Automatic Rotation of Thermistor for Removal
of Thermocouple Effects
n
Built-In Linearization Coefficients for Types
44004/44033, 44005/44030, 44006/44031,
44007/44034, 44008/44032, and YSI-400
n
Programmable Custom Steinhart-Hart or
Custom Coefficients Support
n
Auto Range Current Sources for High
Accuracy
n
Thermistor Resistance Can Be Orders of
Magnitude Larger Than Sense Resistor
n
Hi-Z Sensor and Sense Resistor Input
Thermocouples
Thermistors
RTDs
Diodes
Sensor Specific Features
System Benefits UP TO 20 UNIVERSAL mum/'0 REFERENCE STANDARD COEEETCTENTS KEVVPRDTECTED EEPRDM RE'WNS RA LEAST mv LTCZEEEVT) CHI TO cHzn EuEEEREO TNPUTS ALLOW 21-5 MLIX CUSTOM SOEEEICTENTS STORED IN RAM ACCOMMODATE CUSTOM SENSORS COM 2475K XMDCSAND BUTLHN LTNEARTZATTON PROCESSOR SPT INTERFACE RDTATABLE CURRENT EXOTTATTON
Error Contribution and Peak Noise Errors
System Benefits
SENSOR TYPE TEMPERATURE RANGE SYSTEM ACCURACY 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 RTDPT-10, R
SENSE
= 1kΩ
Platinum RTDPT-100, R
SENSE
= 2kΩ
Platinum RTDPT-500, R
SENSE
= 2kΩ
Platinum RTDPT-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
CH1 TO CH20
UP TO 20 UNIVERSAL
INPUTS ALLOW COMMON
H/W SHARING FOR
DIFFERENT SENSOR
TYPES
STANDARD COEFFICIENTS
STORED IN ROM ELIMINATE
LOOKUP TABLES
KEY-PROTECTED EEPROM
RETAINS RAM DATA FOR AT
LEAST 10 YEARS (LTC2984,
LTC2986-1)
CUSTOM COEFFICIENTS
STORED IN RAM
ACCOMMODATE
CUSTOM SENSORS
BUILT-IN LINEARIZATION
AND FAULTS ALLEVIATE
CODING AND HOST
PROCESSOR RESOURCES
SPI INTERFACE
PROVIDES CONVENIENT
DEVICE CONFIGURATION
AND SENSOR READOUT
IN °C OR °F
BUFFERED INPUTS ALLOW
EXTERNAL PROTECTION
AND FILTERING
WITHOUT DROOP ERRORS
24-BIT ∑∆ADCs AND
15PPM REFERENCE ENABLE
BENCHTOP ACCURACY
MEASUREMENTS
ROTATABLE CURRENT
SOURCES ELIMINATE
THERMOCOUPLE EFFECTS IN
RESISTIVE MEASUREMENTS
LTC298X
ADC1
ADC2
ADC3
15ppm/°C REFERENCE
21:6 MUX
ROM
EEPROM
EXCITATION
CURRENT SOURCES
PROCESSOR
Evaluatinn Cane Develnpmem .5 mg uczsas [‘ ’. m mm ‘ an my Wm . L7,”; LIMWERSAL PRUTECTED BOARD 0432507 (LTCZEEEI ‘ Lmdumu ONE 0432025 mun Mama rm: Ammo man man mu «mama 3 THERM‘STDR BEARD uczzm L7 LJIJW NDW pm ur ANALOG DEVICES
Hardware and Software Development
UNIVERSAL 4-INPUT BOARD DC2211
UNIVERSAL PROTECTED BOARD DC2507 (LTC2986)
20-INPUT BREAKOUT BOARD
DC2296 (LTC2983), DC2420 (LTC2984), DC2531 (LTC2986)
OR DC2608 (LTC2986-1) DEMO KIT
RTD BOARD DC2213
MOTHERBOARD
Linduino® ONE DC2026
THERMOCOUPLE BOARD DC2212
THERMISTOR BOARD DC2214
Evaluation
QuikEval GUI
Software
Code Development
Arduino IDE
(C Coding Environment with
Libraries & Examples)
1016D
www.linear.com/2983 n 1-800-4-LINEAR

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