Overview
The XTR105UA is a monolithic 4mA-to-20mA, 2-wire current transmitter produced by Texas Instruments. This device is designed to provide complete current excitation for platinum RTD temperature sensors and bridges, instrumentation amplifiers, and current output circuitry on a single integrated circuit. It features versatile linearization circuitry that achieves a 2nd-order correction to the RTD, significantly improving linearity. The XTR105UA operates on loop power-supply voltages ranging from 7.5V to 36V and is specified for the industrial temperature range of –40°C to +85°C.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage Range | 7.5 | 36 | V | |
| Operating Temperature Range | –40 | +85 | °C | |
| Output Current Range | 4 | 20 | mA | |
| Precision Current Sources | 800 | 800 | µA | |
| Offset Drift | 0.4 | µV/°C | ||
| Output Current Noise | 30 | nAPP | ||
| PSR (Power Supply Rejection) | 110 | dB | ||
| CMR (Common Mode Rejection) | 86 | dB | ||
| Package Types | DIP-14, SO-14 |
Key Features
- Low unadjusted error
- Two precision current sources: 800µA each
- Linearization for RTD sensors
- 2-wire or 3-wire RTD operation
- Low offset drift: 0.4µV/°C
- Low output current noise: 30nAPP
- High PSR: 110dB minimum
- High CMR: 86dB minimum
- Wide supply range: 7.5V to 36V
Applications
- Field transmitter and sensor
- Factory automation
- Industrial process control
- SCADA remote data acquisition
- Temperature and pressure transducers
- Compatible with HART modem
Q & A
- What is the XTR105UA used for? The XTR105UA is used as a 4mA-to-20mA current transmitter for applications involving platinum RTD temperature sensors, instrumentation amplifiers, and current output circuitry.
- What is the operating temperature range of the XTR105UA? The operating temperature range is –40°C to +85°C.
- What are the precision current sources of the XTR105UA? The device has two precision current sources, each providing 800µA.
- What is the supply voltage range for the XTR105UA? The supply voltage range is from 7.5V to 36V.
- What types of packages are available for the XTR105UA? The XTR105UA is available in DIP-14 and SO-14 packages.
- What is the typical application of the XTR105UA in industrial settings? It is commonly used in industrial process control, factory automation, and SCADA remote data acquisition.
- Does the XTR105UA support HART modem compatibility? Yes, it is compatible with HART modems.
- What is the significance of linearization in the XTR105UA? The linearization circuitry provides a 2nd-order correction to the RTD, achieving a 40:1 improvement in linearity.
- How does the XTR105UA handle noise and drift? It features low output current noise (30nAPP) and low offset drift (0.4µV/°C).
- What are the key electrical characteristics of the XTR105UA? It includes high PSR (110dB) and high CMR (86dB), ensuring robust performance against power supply and common-mode noise.
