Overview
The XTR105PAG4, 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, bridges, instrumentation amplifiers, and current output circuitry on a single integrated circuit. It features a differential voltage input and operates on loop power-supply voltages down to 7.5V, making it versatile for various industrial applications. The XTR105PAG4 is available in DIP-14 and SO-14 surface-mount packages and is specified for the industrial temperature range of –40°C to +85°C.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Power Supply (V+) | 7.5 | 24 | 36 | V |
| Operating Temperature (TA) | –40 | 85 | °C | |
| Output Current Range | 4 | 20 | mA | |
| Output Current Noise (0.1Hz to 10Hz) | 0.03 | μAPP | ||
| Current Sources Accuracy | ±0.05% | ±0.2% | ||
| VREG Output Voltage | 5.1V | |||
| Common-Mode Input Range | 1.25 | 3.5 | V |
Key Features
- Low unadjusted error and high accuracy in current transmission.
- Two precision current sources, each providing 800µA.
- Linearization circuitry for 2nd-order correction to RTD, achieving a 40:1 improvement in linearity.
- Support for 2-wire or 3-wire RTD operation.
- Low offset drift (0.4µV/°C) and low output current noise (30nAPP).
- High power supply rejection ratio (PSR) of 110dB minimum and high common-mode rejection ratio (CMR) of 86dB minimum.
- 5.1V voltage regulator output for powering external circuitry.
- Available in DIP-14 and SO-14 surface-mount packages.
Applications
- Field transmitter and sensor applications.
- Factory automation and industrial process control.
- Compatible with HART modem for enhanced communication.
- Temperature and pressure transducers.
- SCADA remote data acquisition systems.
- Voltage-to-current amplifier applications.
Q & A
- What is the operating temperature range of the XTR105PAG4?
The XTR105PAG4 operates within the industrial temperature range of –40°C to +85°C.
- What is the power supply range for the XTR105PAG4?
The device operates on loop power-supply voltages from 7.5V to 36V.
- What is the output current range of the XTR105PAG4?
The output current range is from 4mA to 20mA.
- Does the XTR105PAG4 support linearization for RTD sensors?
Yes, it features versatile linearization circuitry that provides a 2nd-order correction to the RTD, achieving a 40:1 improvement in linearity.
- What are the package options for the XTR105PAG4?
The device is available in DIP-14 and SO-14 surface-mount packages.
- What is the purpose of the 5.1V voltage regulator output?
The 5.1V voltage regulator output is provided to power external circuitry such as buffer amplifiers.
- Can the XTR105PAG4 be used with HART modems?
Yes, it is compatible with HART modems for enhanced communication in industrial applications.
- What are the typical applications of the XTR105PAG4?
Typical applications include field transmitters, factory automation, temperature and pressure transducers, and SCADA remote data acquisition systems.
- How does the XTR105PAG4 handle common-mode noise?
The device has a high common-mode rejection ratio (CMR) of 86dB minimum and can be bypassed with a capacitor to minimize common-mode noise.
- What is the accuracy of the current sources in the XTR105PAG4?
The current sources have an accuracy of ±0.05% to ±0.2% depending on the device variant.
