XTR114U

Sensor And Detector Interfaces Overview

The XTR114U is a monolithic two-wire 4-20mA current transmitter manufactured by Burr-Brown. It integrates precision instrumentation amplifiers, sensor excitation sources, and linearization circuitry on a single chip. The device provides two matched 100µA current sources for RTD or bridge excitation. It features second-order linearization to correct platinum RTD nonlinearity, achieving a 40:1 improvement in linearity. The unit operates from a loop supply voltage range of 7.5V to 36V and supports both two-wire and three-wire RTD connections. It is housed in an SO-14 surface-mount package.

Sensor And Detector Interfaces Feature Summary

• Integrated second-order linearization circuitry compensates for inherent RTD nonlinearity.
• Dual precision current sources provide stable excitation for high impedance sensors.
• Low offset drift and low output noise ensure high measurement accuracy without adjustment.
• Supports versatile instrumentation amplifier gain configuration for various temperature ranges.

Sensor And Detector Interfaces Applications

• Industrial process control systems
• Factory automation monitoring
• SCADA remote data acquisition networks
• Remote temperature and pressure transducers

Sensor And Detector Interfaces Procurement Notes

Verify the specific ordering suffix when purchasing. The 'U' designation indicates the standard SO-14 surface-mount package. Confirm availability of tape and reel options if required for automated assembly processes. Ensure compatibility with the specified industrial temperature range for the target environment.

Sensor And Detector Interfaces Selection Notes

Select the XTR114U over the XTR112 when lower excitation currents are required for the connected sensor. The 100µA sources are suitable for specific resistance values where higher currents might cause self-heating errors. Verify that the external gain-setting resistor network matches the desired full-scale input range for accurate transconductance.

Sensor And Detector Interfaces Part Context

Burr-Brown was acquired by Texas Instruments in 2000. The XTR114U belongs to the legacy Burr-Brown product line now managed under TI's High Performance Analog division. This component represents the company's expertise in precision analog signal conditioning and industrial interface solutions.

Sensor And Detector Interfaces Replacement Considerations

The XTR112 serves as the primary functional counterpart within the same series, differing only in excitation current magnitude. Direct pin-compatible replacements should be verified against updated datasheets to ensure identical pinout and electrical characteristics.

Sensor And Detector Interfaces FAQ

How does the XTR114U handle RTD nonlinearity?

It utilizes internal linearization circuitry combined with external resistors (RLIN1 and RLIN2) to provide second-order correction, typically improving linearity by a factor of 40 compared to uncompensated outputs.

What is the function of the IRET pin?

The IRET pin serves as the return path for all current from the internal current sources and VREG. It allows external circuit currents to be sensed and included in the output current calculation without introducing error.

Can the device operate without an external transistor?

Yes, but it is not recommended for extended temperature ranges. Operation without an external transistor may degrade accuracy due to internal power dissipation, and a resistor between IRET and Emitter pins may be needed below 0°C.