Overview
The XTR117AIDGKT, 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 a fundamental building block of smart sensors and is widely used in various industrial and process control applications. It features a low quiescent current, a built-in 5-V regulator for powering external circuitry, and high accuracy in current scaling and output current limit functions.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Quiescent Current | 130 | µA |
| Regulator Voltage | 5 | V |
| Span Error | 0.05% | |
| Nonlinearity Error | 0.003% | |
| Loop Supply Range | 7.5 V to 36 V | |
| Operating Temperature Range | –40°C to +125°C | |
| Packages | VSON-8, VSSOP-8 | |
| Current Gain | 100 | |
| Small-signal Bandwidth | 380 kHz | |
| Slew Rate | 3.2 mA/µs |
Key Features
- Low quiescent current of 130 µA, minimizing power consumption.
- Built-in 5-V regulator to power external circuitry.
- High accuracy with low span error (0.05%) and nonlinearity error (0.003%).
- Wide-loop supply range from 7.5 V to 36 V, ensuring flexibility in various applications.
- Operating temperature range of –40°C to +125°C, suitable for harsh environments.
- Available in VSON-8 and VSSOP-8 packages, offering compact and thermally efficient designs.
- Current gain of 100, allowing precise control over output current.
- Reverse-voltage protection and overvoltage surge protection capabilities.
- External transistor support to handle high loop voltages and currents.
Applications
- Two-wire, 4-20 mA current-loop transmitter.
- Smart transmitter in industrial process control systems.
- Test systems requiring precise current output.
- Current amplifier and voltage-to-current amplifier applications.
- Industrial process control and automation systems.
Q & A
- What is the primary function of the XTR117AIDGKT?
The XTR117AIDGKT 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 quiescent current of the XTR117AIDGKT?
The quiescent current is 130 µA.
- What is the voltage output of the built-in regulator?
The built-in regulator provides a 5-V output.
- What are the typical applications of the XTR117AIDGKT?
Typical applications include two-wire current-loop transmitters, smart transmitters, industrial process control, test systems, current amplifiers, and voltage-to-current amplifiers.
- What is the operating temperature range of the XTR117AIDGKT?
The operating temperature range is –40°C to +125°C.
- What packages are available for the XTR117AIDGKT?
The device is available in VSON-8 and VSSOP-8 packages.
- How does the XTR117AIDGKT protect against overvoltage surges?
The device can be protected using Zener diodes or surge clamping diodes, and it is recommended to limit the maximum surge voltage to as low as practical.
- Can the XTR117AIDGKT be used without an external transistor?
While it is possible, using an external transistor is recommended to avoid self-heating concerns, especially at higher loop voltages and currents.
- What is the maximum output current limit of the XTR117AIDGKT?
The internal circuitry limits the output current to approximately 32 mA to protect the transmitter and loop power or measurement circuitry.
- How can the output current range be extended?
The output current range can be extended by connecting an external resistor from pin 3 to pin 5 to change the current limit value.
