The XTR115 and XTR116 are precision current output converters designed to transmit analog 4-to-20mA signals over an industry standard current loop. They provide accurate current scaling and output current limit functions. The on-chip voltage regulator (5V) can be used to power external circuitry. A precision on-chip VREF (2.5V for XTR115 and 4.096V for XTR116) can be used for offsetting or to excite transducers. A current return pin (IRET) senses any current used in external circuitry to assure an accurate control of the output current. The XTR115 is a fundamental building block of smart sensors using 4-to-20mA current transmission. The XTR115 and XTR116 are specified for operation over the extended industrial temperature range, –40°C to +85°C.
The XTR115 and XTR116 are precision current‑output converters that generate a 4‑20 mA loop signal for industrial process control, smart transmitters, and test systems. They include an on‑chip 5 V regulator for external circuitry and provide reference voltages of 2.5 V (XTR115) and 4.096 V (XTR116). The devices feature low span error (0.05 %), low non‑linearity (0.003 %), and a wide loop supply range of 7.5 V to 36 V.
Typical applications include two‑wire current loops, HART‑compatible smart sensors, voltage‑to‑current conversion, and current amplification. The datasheet details specifications, pin configuration, absolute maximum ratings, performance curves, protection methods, and mechanical dimensions for the SO‑8 package.
| Quiescent current | 200 µA |
|---|---|
| Reference voltage (XTR115) | 2.5 V |
| Reference voltage (XTR116) | 4.096 V |
| Low span error | 0.05 % |
| Low non‑linearity error | 0.003 % |
| Loop supply voltage range | 7.5 V to 36 V |
| Package type | SO‑8 |
| Operating temperature range | –40 °C to +85 °C |
| Linear output current range | 0.25 mA to 25 mA |
| Slew rate | 3.2 mA/µs |
The quiescent current is 200 µA.
The XTR115 provides a 2.5 V reference and the XTR116 provides a 4.096 V reference.
They operate with a supply voltage from 7.5 V up to 36 V.
The devices provide accurate linear output up to 25 mA, with an internal limit around 32 mA.