Overview
The XTR105U, produced by Texas Instruments, is a monolithic 4mA-to-20mA, 2-wire current transmitter. 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 operates within a wide supply range of 7.5V to 36V and is specified for the industrial temperature range of –40°C to +85°C. The XTR105U is available in DIP-14 and SO-14 surface-mount packages, making it versatile for various industrial applications.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | DIP-14, SO-14 |
| Pins | 14 |
| Operating Temperature Range (°C) | –40 to 85 |
| Supply Voltage Range (V) | 7.5 to 36 |
| Current Output Range (mA) | 4 to 20 |
| Precision Current Sources | 2 x 800µA |
| Low Offset Drift (µV/°C) | 0.4 |
| Output Current Noise (nAPP) | 30 |
| Power Supply Rejection Ratio (PSR) (dB) | 110 minimum |
| Common Mode Rejection Ratio (CMR) (dB) | 86 minimum |
Key Features
- Low unadjusted error
- Two precision current sources: 800µA each
- Linearization circuitry providing 2nd-order correction to RTD, achieving a 40:1 improvement in linearity
- 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
The XTR105U is suitable for a variety of industrial applications, including:
- Platinum RTD temperature sensors and bridges
- Instrumentation amplifiers
- Current output circuitry
- Temperature and pressure measurements
Q & A
- What is the operating temperature range of the XTR105U?
The XTR105U operates within a temperature range of –40°C to +85°C. - What are the available package types for the XTR105U?
The XTR105U is available in DIP-14 and SO-14 surface-mount packages. - What is the supply voltage range for the XTR105U?
The supply voltage range is from 7.5V to 36V. - What is the current output range of the XTR105U?
The current output range is from 4mA to 20mA. - How many precision current sources does the XTR105U have?
The XTR105U has two precision current sources, each providing 800µA. - What is the typical improvement in linearity provided by the linearization circuitry?
The linearization circuitry typically achieves a 40:1 improvement in linearity. - What is the low offset drift of the XTR105U?
The low offset drift is 0.4µV/°C. - What is the output current noise of the XTR105U?
The output current noise is 30nAPP. - What are the PSR and CMR values of the XTR105U?
The PSR is 110dB minimum, and the CMR is 86dB minimum. - For what types of measurements can the instrumentation amplifier gain be configured?
The instrumentation amplifier gain can be configured for a wide range of temperature or pressure measurements.
