Overview
The XTR115U, produced by Texas Instruments, is a precision current output converter designed to transmit analog 4-mA-to-20-mA signals over an industry standard current loop. This device is part of the XTR11x series, which includes the XTR115 and XTR116, differing primarily in their reference voltage outputs. The XTR115U provides accurate current scaling and output current limit functions, making it a fundamental building block for smart sensors and industrial process control systems.
The device features an on-chip 5-V regulator for powering external circuitry and a precision on-chip reference voltage (VREF) of 2.5 V for the XTR115U, which can be used for offsetting or exciting transducers. It operates over an extended industrial temperature range of –40°C to +85°C.
Key Specifications
| Parameter | Condition | Min | Max | Units | |
|---|---|---|---|---|---|
| Output Current Equation | IO = IIN × 100 | ||||
| Output Current, Linear Range | 0.25 | 25 | mA | ||
| Overscale Limit | 32 | mA | |||
| Underscale Limit | IREG = 0, IREF = 0 | 0.2 | 0.25 | mA | |
| Span (Current Gain) | 100 | A/A | |||
| Quiescent Current | 200 | 250 | µA | ||
| Operating Temperature Range | –40 | +85 | °C | ||
| VREF | 2.5 | V | |||
| Voltage Regulator (VREG) | 5 | V | |||
| Loop Supply Range | 7.5 | 36 | V |
Key Features
- Low quiescent current: 200 µA
- 5-V regulator for external circuits
- Precision on-chip VREF (2.5 V for XTR115U) for sensor excitation
- Low span error: 0.05%
- Low nonlinearity error: 0.003%
- Wide loop supply range: 7.5 V to 36 V
- SO-8 package
- Current return pin (IRET) for accurate control of output current
Applications
- 2-wire, 4-20-mA current loop transmitter
- Smart transmitter
- Industrial process control
- Test systems
- Compatible with HART modem
- Current amplifier
- Voltage-to-current amplifier
Q & A
- What is the primary function of the XTR115U?
The XTR115U is a precision current output converter designed to transmit analog 4-mA-to-20-mA signals over an industry standard current loop.
- What is the reference voltage output of the XTR115U?
The reference voltage output (VREF) of the XTR115U is 2.5 V.
- What is the operating temperature range of the XTR115U?
The XTR115U operates over an extended industrial temperature range of –40°C to +85°C.
- What is the quiescent current of the XTR115U?
The quiescent current of the XTR115U is 200 µA.
- What is the loop supply range for the XTR115U?
The loop supply range for the XTR115U is 7.5 V to 36 V.
- What package type is the XTR115U available in?
The XTR115U is available in an SO-8 package.
- Can the XTR115U be used in smart transmitter applications?
Yes, the XTR115U can be used in smart transmitter applications.
- Is the XTR115U compatible with HART modems?
Yes, the XTR115U is compatible with HART modems.
- What is the span error of the XTR115U?
The span error of the XTR115U is 0.05%.
- What is the nonlinearity error of the XTR115U?
The nonlinearity error of the XTR115U is 0.003%.
