Overview
The XTR105P, produced by Texas Instruments, is a monolithic 4mA-to-20mA, 2-wire current transmitter designed for precision applications. This device integrates two precision current sources and provides complete current excitation for platinum RTD temperature sensors, bridges, instrumentation amplifiers, and current output circuitry on a single integrated circuit. It is particularly notable for its versatile linearization circuitry, which achieves a 2nd-order correction to the RTD, resulting in a 40:1 improvement in linearity. The XTR105P operates on loop power-supply voltages down to 7.5V and is available in DIP-14 and SO-14 surface-mount packages, specified for the industrial temperature range of –40°C to +85°C.
Key Specifications
| Parameter | Min | 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) | 30 | nAPP | ||
| PSR (Power Supply Rejection Ratio) | 110 | dB | ||
| CMR (Common Mode Rejection Ratio) | 86 | dB | ||
| Current Sources Accuracy | ±0.05% | ±0.2% | ||
| Linearity Correction Accuracy | ±0.2% | ±1% | ||
| Package Types | DIP-14, SO-14 |
Key Features
- Monolithic 4mA-to-20mA, 2-wire current transmitter with two precision current sources.
- Complete current excitation for platinum RTD temperature sensors, bridges, instrumentation amplifiers, and current output circuitry.
- Versatile linearization circuitry providing a 2nd-order correction to the RTD, achieving a 40:1 improvement in linearity.
- Low unadjusted error, including zero output current drift, span drift, and nonlinearity.
- Low offset drift and output current noise.
- High PSR and CMR.
- Wide supply range: 7.5V to 36V.
- Available in DIP-14 and SO-14 surface-mount packages.
- Specified for the industrial temperature range of –40°C to +85°C.
Applications
- Field transmitter and sensor applications.
- Factory automation and industrial process control.
- Temperature and pressure transducers.
- SCADA remote data acquisition.
- Compatible with HART modem.
- Voltage-to-current amplifier applications.
Q & A
- What is the XTR105P used for?
The XTR105P is a 4mA-to-20mA, 2-wire current transmitter used for precision applications such as temperature and pressure measurements, field transmitters, and industrial process control.
- What are the key features of the XTR105P?
The XTR105P features two precision current sources, versatile linearization circuitry, low unadjusted error, high PSR and CMR, and a wide supply range.
- What is the operating temperature range of the XTR105P?
The XTR105P operates within the industrial temperature range of –40°C to +85°C.
- What are the available package types for the XTR105P?
The XTR105P is available in DIP-14 and SO-14 surface-mount packages.
- How does the linearization circuitry improve the RTD response?
The linearization circuitry provides a 2nd-order correction to the RTD, achieving a 40:1 improvement in linearity.
- What is the power supply range for the XTR105P?
The XTR105P operates on loop power-supply voltages from 7.5V to 36V.
- Is the XTR105P compatible with HART modems?
Yes, the XTR105P is compatible with HART modems.
- What are some common applications of the XTR105P?
Common applications include field transmitters, factory automation, temperature and pressure transducers, and SCADA remote data acquisition.
- How accurate are the current sources in the XTR105P?
The current sources have an accuracy of ±0.05% to ±0.2% depending on the specific model.
- What is the significance of the 5.1V regulator output in the XTR105P?
The 5.1V regulator output is provided to power external circuitry such as buffer amplifiers.
