The XTR105 is a monolithic 4mA to 20mA, 2-wire current transmitter with two precision current sources. This device provides complete current excitation for platinum RTD temperature sensors and bridges, instrumentation amplifiers, and current output circuitry on a single integrated circuit.
Versatile linearization circuitry provides a 2nd-order correction to the RTD, typically achieving a 40:1 improvement in linearity.
Instrumentation amplifier gain can be configured for a wide range of temperature or pressure measurements. Total unadjusted error of the complete current transmitter is low enough to permit use without adjustment in many applications. This includes zero output current drift, span drift, and nonlinearity. The XTR105 operates on loop power-supply voltages down to 7.5V.
The XTR105 is available in DIP-14 and SOIC-14 surface-mount packages and is specified for the industrial temperature range of –40°C to +85°C.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | XTR105 4-20mA Current Transmitter With Sensor Excitation and Linearization datasheet (Rev. D) | PDF | HTML | Dec 12, 2025 |
| Analog design Journal | 4Q 2011 Issue Analog Applications Journal | Nov 9, 2011 | ||
| Analog design Journal | Analog linearization of resistance temperature detectors | Nov 9, 2011 | ||
| Application note | 20mA to 0-20mA Converter & Current Summing Current-to-Current Converters | Oct 2, 2000 | ||
| Application note | FOUR-WIRE RTD CURRENT-LOOP TRANSMITTER | Sep 27, 2000 | ||
| Application note | IC Building Blocks Form Complete Isolated 4-20mA Current-Loop | Sep 27, 2000 |
For additional terms or required resources, click any title below to view the detail page where available.
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This spreadsheet calculates error for Current Transmitter (XTR) devices and external components.
This design features a single-chip solution to linearize and transmit a 3-wire PT100 RTD over the industry standard 2-wire 4-20mA current loop. The design was configured for a -200°C to 800°C temperature range, but other temperature ranges can be achieved by adjusting the (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SOIC (D) | 14 | Ultra Librarian |
| PDIP (N) | 14 | Ultra Librarian |
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