Precision Voltage-to-Current Conversion: The Preferred Choice – XTR111AIDGQR

In industrial automation and process control, transmitting analog signals over long distances has always faced challenges from noise interference and signal attenuation. The current loop (4‑20 mA), with its strong anti‑interference capability and simple wiring, has become the standard signal transmission method in industrial field applications. The XTR111AIDGQR from Texas Instruments (TI) is a precision voltage‑to‑current converter/transmitter purpose‑built for such applications.

1. Product Overview

The XTR111AIDGQR is a high‑precision V‑I conversion IC that proportionally converts an input voltage signal into a standard 0‑20 mA or 4‑20 mA current output, with a maximum output current of up to 36 mA. It comes in a 10‑pin HVSSOP package (MSOP‑10‑EP) supporting surface‑mount assembly, and is compact in size. The device operates over a wide temperature range from -55°C to +125°C, making it suitable for various harsh industrial environments.

2. Key Parameters

Parameter	Specification
Supply voltage range	7 V ~ 44 V (recommended 8 V ~ 40 V)
Quiescent current	450 μA ~ 550 μA
Output current range	0‑20 mA / 4‑20 mA (max 36 mA)
Accuracy	0.015%
Non‑linearity	0.002%
Input offset voltage	1.5 mV
Input bias current	25 nA
Operating temperature	-55 °C ~ +125 °C
Package	MSOP‑10‑EP

3. Operating Principle and Applications

The core of the XTR111AIDGQR consists of a high‑precision operational amplifier and a precision current‑sense circuit. The ratio between the input voltage and the output current is set by a single external resistor (RSET), making the design extremely simple. The chip also integrates an adjustable sub‑regulator (3 V to 15 V) that can supply power to external circuits, while the external P‑channel MOSFET ensures high output impedance and a wide compliance voltage range.

Key application areas include: general‑purpose voltage‑controlled current sources, current/voltage outputs for 3‑wire sensor systems, programmable PLC output drivers, industrial process control, and factory automation.

4. Q&A Session

Q: What is the minimum operating voltage supported by the XTR111AIDGQR?
A: The chip itself supports a minimum supply of 7 V, but for industrial use, 8 V or higher is typically recommended to ensure stable operation.

Q: Can the XTR111AIDGQR be used in a 2‑wire current loop?
A: The XTR111 generally requires a 3‑wire connection (24 VDC, Iout, GND). If AC power is already available on‑site, a 2‑wire transmission can be achieved by using a local isolated power supply.
https://www.fudongic.com/
Q: How is the ratio between output current and input voltage set?
A: It is set by a single external resistor RSET, making the design very simple and flexible.

Q: Can this device output a voltage signal as well?
A: Yes, the XTR111 circuit can be modified to operate in voltage‑output mode.

5. Conclusion

With its wide supply voltage range (7‑44 V), high accuracy (0.015%), low quiescent current (450 μA), and flexible output configuration, the XTR111AIDGQR has become a classic choice for industrial current‑loop signal conversion. Whether used in PLC analog outputs, sensor signal conditioning, or remote data acquisition, the XTR111AIDGQR provides a reliable and cost‑effective solution.

Fudong Communication (Shenzhen) Group Co., Ltd., established in 2004, is a specialized global first tier semiconductor agent/distributor.

Fudong Mall is an online e-commerce platform belonging to Fudong Communication (Shenzhen) Group Co., Ltd. Fudong collaborates with global electronic component distributors and Chinese spot inventory suppliers.