Overview
The XTR105PA, 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 two precision current sources, each capable of delivering 800µA, and includes versatile linearization circuitry that can achieve a 40:1 improvement in linearity for RTD measurements. The XTR105PA 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. It is available in DIP-14 and SO-14 surface-mount packages.
Key Specifications
| Parameter | Minimum | Typical | Maximum | 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 | ||
| Power Supply Rejection Ratio (PSR) | 110 | dB | ||
| Common Mode Rejection Ratio (CMR) | 86 | dB | ||
| Current Sources Accuracy | ±0.05% | ±0.4% | ||
| Offset Drift | ±0.4 | ±1.5 | µV/°C |
Key Features
- Low unadjusted error
- Two precision current sources: 800µA each
- Linearization for RTD measurements, 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 Power Supply Rejection Ratio (PSR): 110dB minimum
- High Common Mode Rejection Ratio (CMR): 86dB minimum
- Wide supply range: 7.5V to 36V
- Packages: DIP-14 and SO-14
Applications
- Field transmitter and sensor
- Factory automation
- Compatible with HART modem
- Temperature and pressure transducers
- Industrial process control
- SCADA remote data acquisition
- 2-wire, 4-20mA current loop
- Voltage-to-current amplifier
Q & A
- What is the operating temperature range of the XTR105PA?
The XTR105PA operates within the industrial temperature range of –40°C to +85°C.
- What are the package options for the XTR105PA?
The XTR105PA is available in DIP-14 and SO-14 surface-mount packages.
- What is the power supply range for the XTR105PA?
The XTR105PA operates on loop power-supply voltages ranging from 7.5V to 36V.
- What is the output current range of the XTR105PA?
The output current range is from 4mA to 20mA.
- Does the XTR105PA support linearization for RTD measurements?
- What are the key applications of the XTR105PA?
The XTR105PA is used in field transmitters, factory automation, temperature and pressure transducers, industrial process control, and SCADA remote data acquisition.
- How accurate are the current sources in the XTR105PA?
The current sources have an accuracy of ±0.05% to ±0.4% depending on the temperature and supply voltage.
- What is the common-mode rejection ratio (CMR) of the XTR105PA?
The CMR is 86dB minimum.
- How does the XTR105PA handle noise?
The XTR105PA has low output current noise of 30nAPP and high PSR and CMR to minimize noise effects.
- Can the XTR105PA be used without adjustment in many applications?
