Overview
The XTR105U/2K5 from Texas Instruments is a monolithic 4-20 mA, 2-wire current transmitter designed to provide complete current excitation for platinum RTD temperature sensors, bridges, instrumentation amplifiers, and current output circuitry on a single integrated circuit. This device features two precision current sources, each delivering 800 µA, and includes versatile linearization circuitry that achieves a significant improvement in linearity, typically a 40:1 reduction in nonlinearity for RTD measurements. The XTR105U/2K5 operates over a wide supply range of 7.5 V to 36 V and is available in a SOIC-14 surface-mount package, suitable for industrial temperature ranges from –40°C to +85°C.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Package | SOIC-14 | |
| Supply Voltage Range | 7.5 V to 36 V | V |
| Output Current Range | 4 mA to 20 mA | mA |
| Current Sources | 2 x 800 µA | µA |
| Operating Temperature Range | –40°C to +85°C | °C |
| Offset Drift | 0.4 µV/°C | µV/°C |
| Output Current Noise | 30 nA PP | nA PP |
| Power Supply Rejection Ratio (PSR) | 110 dB minimum | dB |
| Common Mode Rejection Ratio (CMR) | 86 dB minimum | dB |
Key Features
- Low unadjusted error
- Two precision current sources: 800 µA each
- Linearization for RTD measurements, achieving a 40:1 improvement in linearity
- 2-wire or 3-wire RTD operation
- Low offset drift: 0.4 µV/°C
- Low output current noise: 30 nA PP
- High PSR: 110 dB minimum
- High CMR: 86 dB minimum
- Wide supply range: 7.5 V to 36 V
Applications
- Industrial process control
- Factory automation
- SCADA remote data acquisition
- Remote temperature and pressure transducers
- Field transmitter and sensor applications
- Compatible with HART modem
Q & A
- What is the primary function of the XTR105U/2K5?
The XTR105U/2K5 is a 4-20 mA, 2-wire current transmitter that provides complete current excitation for platinum RTD temperature sensors, bridges, instrumentation amplifiers, and current output circuitry.
- What are the key features of the XTR105U/2K5?
Key features include low unadjusted error, two precision current sources, linearization for RTD measurements, 2-wire or 3-wire RTD operation, low offset drift, low output current noise, high PSR, and high CMR.
- What is the operating temperature range of the XTR105U/2K5?
The operating temperature range is from –40°C to +85°C.
- What is the supply voltage range for the XTR105U/2K5?
The supply voltage range is from 7.5 V to 36 V.
- What types of applications is the XTR105U/2K5 suitable for?
Suitable applications include industrial process control, factory automation, SCADA remote data acquisition, and remote temperature and pressure transducers.
- What is the package type of the XTR105U/2K5?
The XTR105U/2K5 is available in a SOIC-14 surface-mount package.
- How does the XTR105U/2K5 improve RTD measurement linearity?
The device includes versatile linearization circuitry that achieves a 40:1 improvement in linearity for RTD measurements.
- What is the output current range of the XTR105U/2K5?
The output current range is from 4 mA to 20 mA.
- Does the XTR105U/2K5 support HART modem compatibility?
Yes, the XTR105U/2K5 is compatible with HART modem applications.
- What are the typical current sources provided by the XTR105U/2K5?
The device provides two precision current sources, each delivering 800 µA.
