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Universal Temperature Sensor IC Linearizes Temperature Sensors with 0.1°C AccuracyMILPITAS, CA - November 24, 2014 - Linear Technology Corporation introduces the LTC2983 high performance digital temperature measurement IC which directly digitizes RTDs, thermocouples, thermistors and external diodes with 0.1°C accuracy and 0.001°C resolution. A high performance analog front end combines low noise and low offset buffered ADCs with all the necessary excitation and control circuits for each sensor. Measurements are performed under the control of a digital engine combining all the algorithms and linearization required for each. The LTC2983 provides a multiplexed high precision interface to virtually any sensor. It precisely measures absolute microvolt level signals from thermocouples and ratiometric resistance measurements from RTDs and thermistors, linearizes the results and outputs the results in °C or °F. Up to twenty analog inputs are available and digitized measurements can be output in Centigrade or Fahrenheit. The SPI interface works with virtually any digital system and a comprehensive software support system with drop-down menus allows easy customizing of the LTC2983.
Complete 20-Channel Digital Temperature Measurement SoC Click Photo for High-Res Image
The simple, yet feature-rich, LTC2983 interfaces with a wide variety of temperature sensors, including type B, E, J, K, N, S, R, T thermocouples, 2,3, or 4-wire RTDs,
2.25kΩ to 30kΩ thermistors and temperature sensing diodes. The LTC2983 works with ground referenced sensors without the need for amplifiers, negative supplies, or level shift circuitry. Signals are simultaneously digitized with three, high accuracy, 24- bit ΔΣ ADCs using an internal 10ppm/°C reference. Automatic thermocouple cold junction compensation
can be done using any type of external sensor. Included on the chip are linearization algorithms for all common sensor types. Custom sensors can be linearized with custom coefficients programmed into the chip. Dual programmable excitation current sources feature current reversal and current ranging to improve accuracy and reduce noise. To ensure resistive measurements are accurate, current reversal eliminates thermocouple effects in the resistive sensor. Sensor specific fault detection alerts the user of short circuits, open circuits, over temperature, under temperature, and ADC overranging.
The LTC2983 is offered in commercial and industrial versions, supporting operating temperature ranges from 0°C to
70°C and -40°C to 85°C respectively. The LTC2983 is available today in a RoHS compliant, 7mm x 7mm LQFP-48 package. Pricing starts at $19.49 each in 1,000 piece quantities. For more information, visit www.linear.com/product/LTC2983.
Directly Digitize RTDs, Thermocouples, Thermistors & Diodes
Single 2.85V to 5.25V Supply
20 Flexible Inputs Allow Multiple Sensor
Types
Automatic Thermocouple Cold Junction
Compensation
Standard & User-Programmable Coefficients for Linearizing Thermocouples, RTDs & Thermistors Configurable 2-, 3-, 4-Wire RTD Configurations
Measures Negative Thermocouple
LTC2983Voltages Without a Negative Supply Automatic Burn Out, Short-Circuit & Fault Detection
Buffered Inputs Allow External Protection
& Direct Interface to Resistive Sensors Simultaneous 50Hz/60Hz Rejection Includes 10ppm/°C (Max) Reference
48-Lead 7mm x 7mm LQFP Package
Click Photo for High-Res ImageThe USA list pricing shown is for budgetary use only. International prices may differ due to local duties, taxes, fees and exchange rates.
About Linear Technology
Linear Technology Corporation, a member of the S&P 500, has been designing, manufacturing and marketing a broad line of high performance analog integrated circuits for major companies worldwide for over three decades. The Company's products provide an essential bridge between our analog world and the digital electronics in communications, networking, industrial, automotive, computer, medical, instrumentation, consumer, and military and aerospace systems. Linear Technology produces power management, data conversion, signal conditioning, RF and
interface ICs, µModule® subsystems, and wireless sensor network products. For more information, visit
www.linear.com.
, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks of Linear
Technology Corp. All other trademarks are the property of their respective owners.
John Hamburger
Tel: (408) 432-1900 ext. 2419 jhamburger@linear.com
Doug Dickinson
Tel: (408) 432 1900 ext. 2233 ddickinson@linear.com
Fanny Lau
Tel: 852-2428-0303 flau@linear.com
Angela Ao
Tel: (8610)6522 8081 angela.ao@ebacomms.com
Yoshikazu Funasaki Tel: 81-3-5226-7291 yfunasaki@linear.com
Takashi Matsuda
Tel: +81-3-3255-8411 linear@chugai-ad.co.jp
Ralf Stegmann
Tel: +49 (0) 7131 9234-11 ralf@ezwire.com
Clotilde Zeller
Tel: +33 1 4614 87 09 clotilde@ezwire.com
Desiree Park
Tel: +82-2-565-6625 desiree@ezwire.com
Alan Timmins
Tel: +44-1252-629937 alan@ezwire.com
Simona Labianca
Tel: +39 340 0571697 simona@ezwire.com
Alice Wang
Tel: + 886-2-28974705 alice@ezwire.com
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