Overview
The XTR106U, produced by Texas Instruments, is a monolithic 4mA to 20mA, two-wire current transmitter specifically designed for cost-optimized bridge sensor applications. This device integrates complete bridge excitation (with 2.5V or 5V reference), an instrumentation amplifier, sensor linearization, and current output circuitry. It is particularly useful in applications where high accuracy and low drift are critical. The XTR106U operates on loop power supply voltages as low as 7.5V and is available in 14-pin plastic DIP and SOIC surface-mount packages, with an operating temperature range of –40°C to +85°C and an extended temperature range of –40°C to +125°C.
Key Specifications
| Parameter | Test Conditions | Min | Max | Units | |
|---|---|---|---|---|---|
| Output Current Range | 4 | 20 | mA | ||
| Overscale Limit | 24 | 30 | mA | ||
| Underscale Limit | IREG = 0, IREF = 0 | 1 | 2.2 | mA | |
| Zero Output Current | VIN = 0V, RG = ∞ | 4 | mA | ||
| Initial Error | ±5 | ±25 | μA | ||
| Temperature Drift | TA = –40°C to +85°C | ±0.07 | ±0.9 | μA/°C | |
| Supply Voltage Range | 7.5 | 36 | V | ||
| PSR (Power Supply Rejection) | 110 | dB | |||
| CMR (Common Mode Rejection) | 86 | dB |
Key Features
- Low total unadjusted error, allowing for use without adjustment in many applications.
- 2.5V and 5V bridge excitation references.
- 5.1V regulator output for powering additional external circuitry.
- Low span drift: ±25ppm/°C maximum.
- Low offset drift: 0.25μV/°C.
- High PSR: 110dB minimum.
- High CMR: 86dB minimum.
- Wide supply range: 7.5V to 36V.
- Available in 14-pin DIP and SOIC package options.
- Linearization circuitry providing up to a 20:1 improvement in nonlinearity.
Applications
- Field transmitter and sensor applications.
- Factory automation.
- Compatible with HART modem.
- Pressure and temperature bridge transmitters.
- Industrial process control.
- SCADA remote data acquisition.
- Weighing systems.
- Strain gauge transmitters.
- Accelerometers.
Q & A
- What is the primary function of the XTR106U?
The XTR106U is a 4mA to 20mA, two-wire current transmitter designed for cost-optimized bridge sensor applications.
- What are the available bridge excitation references for the XTR106U?
The XTR106U provides 2.5V and 5V bridge excitation references.
- What is the operating temperature range of the XTR106U?
The device operates within a temperature range of –40°C to +85°C, with an extended range of –40°C to +125°C.
- What is the minimum supply voltage required for the XTR106U?
The minimum supply voltage is 7.5V.
- What are the package options for the XTR106U?
The device is available in 14-pin plastic DIP and SOIC surface-mount packages.
- How does the linearization circuitry improve the performance of the XTR106U?
The linearization circuitry provides up to a 20:1 improvement in nonlinearity by controlling the bridge excitation voltage.
- What are some common applications of the XTR106U?
Common applications include field transmitter and sensor applications, factory automation, pressure and temperature bridge transmitters, and industrial process control.
- What is the significance of the 5.1V regulator output in the XTR106U?
The 5.1V regulator output provides current for powering additional external input circuitry.
- How does the XTR106U handle common-mode rejection?
The device has a high CMR of 86dB minimum, ensuring good common-mode rejection.
- Is the XTR106U compatible with HART modems?
Yes, the XTR106U is compatible with HART modems.
