Product details

Vs (Min) (V) 4.5 Vs (Max) (V) 5.5 Offset voltage drift (+/-) (Max) (uV/degrees celsius) 0.1 Offset voltage (+/-) (Max) (uV) 50 Product type 2-wire RTD conditioner
Vs (Min) (V) 4.5 Vs (Max) (V) 5.5 Offset voltage drift (+/-) (Max) (uV/degrees celsius) 0.1 Offset voltage (+/-) (Max) (uV) 50 Product type 2-wire RTD conditioner
SSOP (DBQ) 24 52 mm² 8.65 x 6
  • COMPLETE TRANSMITTER +RTD LINEARIZATION
  • TWO-WIRE, 4-20mA OUTPUT
  • VOLTAGE OUTPUT (0.5V to 4.5V)
  • ELIMINATES POTENTIOMETERS AND TRIMMING
  • DIGITALLY CALIBRATED
  • 5V SUB-REGULATOR OUTPUT
  • SERIAL SPI™ BUS INTERFACE
  • SSOP-24 PACKAGE
  • APPLICATIONS
    • REMOTE RTD TRANSMITTERS
    • PRESSURE BRIDGE TRANSMITTERS
    • STRAIN GAGE TRANSMITTERS
    • SCADA REMOTE DATA ACQUISITION
    • WEIGHING SYSTEMS
    • INDUSTRIAL PROCESS CONTROL

SPI is a trademark of Motorola, Inc. All other trademarks are the property of their respective owners.

  • COMPLETE TRANSMITTER +RTD LINEARIZATION
  • TWO-WIRE, 4-20mA OUTPUT
  • VOLTAGE OUTPUT (0.5V to 4.5V)
  • ELIMINATES POTENTIOMETERS AND TRIMMING
  • DIGITALLY CALIBRATED
  • 5V SUB-REGULATOR OUTPUT
  • SERIAL SPI™ BUS INTERFACE
  • SSOP-24 PACKAGE
  • APPLICATIONS
    • REMOTE RTD TRANSMITTERS
    • PRESSURE BRIDGE TRANSMITTERS
    • STRAIN GAGE TRANSMITTERS
    • SCADA REMOTE DATA ACQUISITION
    • WEIGHING SYSTEMS
    • INDUSTRIAL PROCESS CONTROL

SPI is a trademark of Motorola, Inc. All other trademarks are the property of their respective owners.

The XTR108 is a "smart", programmable, 4-20mA, two-wire transmitter designed for temperature and bridge sensors. Zero, span, and linearization errors in the analog signal path can be calibrated via a standard digital serial interface, eliminating manual trimming. Non-volatile ex-ternal EEPROM stores calibration settings.

The all-analog signal path contains an input multiplexer, autozeroed programmable-gain instrumentation amplifier, dual programmable current sources, linearization circuit, voltage reference, sub-regulator, internal oscillator, control logic, and an output current amplifier. Programmable level shifting compensates for sensor DC offsets. Selectable up- and down-scale output indicates out-of-range and burn-out per NAMUR NE43. Automatic reset is initiated when supply is lost.

The XTR108 is a "smart", programmable, 4-20mA, two-wire transmitter designed for temperature and bridge sensors. Zero, span, and linearization errors in the analog signal path can be calibrated via a standard digital serial interface, eliminating manual trimming. Non-volatile ex-ternal EEPROM stores calibration settings.

The all-analog signal path contains an input multiplexer, autozeroed programmable-gain instrumentation amplifier, dual programmable current sources, linearization circuit, voltage reference, sub-regulator, internal oscillator, control logic, and an output current amplifier. Programmable level shifting compensates for sensor DC offsets. Selectable up- and down-scale output indicates out-of-range and burn-out per NAMUR NE43. Automatic reset is initiated when supply is lost.

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XTR105 ACTIVE 4-20mA Current Transmitter with Sensor Excitation and Linearization Non-programmable. Does not include 5V regulator. 2 matched 800uA current sources instead of 500uA sources.
XTR106 ACTIVE 4-20-mA current transmitter with bridge excitation (2.5-V or 5-V reference) and linearization Non-programmable. 5.1V regulator instead of 5V. Includes 2.5V and 5V voltage references. Does not include matched current sources.
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Technical documentation

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Type Title Date
* Data sheet 4-20mA, Two-Wire Transmitter, 'Smart' Programmable with Signal Conditioning datasheet (Rev. C) 12 Jul 2005
User guide XTR108EVM-USB Evaluation Board and Software Tutorial (Rev. A) 15 Sep 2016
Analog design journal 4Q 2011 Issue Analog Applications Journal 09 Nov 2011
Analog design journal Analog linearization of resistance temperature detectors 09 Nov 2011
User guide XTR108EVM User's Guide (Rev. A) 27 Oct 2005

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

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Evaluation board

XTR108EVM-USB — XTR108 Evaluation Module USB Version

Getting started with the XTR108 is made easy with this Evaluation Module. This kit provides the capability of calibrating the XTR108 system with high accuracy and interfacing with multiple types of RTDs or a built-in RTD Emulator circuit.

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Support software

XTR108EVM-USB Source Code

SBOC422.ZIP (6452 KB)
Support software

XTR108EVM-USB Software

SBOC423.ZIP (337477 KB)
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Simulation tool

TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
Schematic

Multi-Cal-Slave Schematic

SBOR015.PDF (535 KB)
Package Pins Download
SSOP (DBQ) 24 View options

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