SBOS124C January   2000  – January 2026 XTR115 , XTR116

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 Recommended Operating Conditions
    3. 6.3 Thermal Information
    4. 6.4 Electrical Characteristics
    5. 6.5 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Reverse-Voltage Protection
      2. 7.3.2 Overvoltage Surge Protection
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 External Transistor
      2. 8.1.2 Minimum Scale Current
      3. 8.1.3 Offsetting the Input
      4. 8.1.4 Maximum Output Current
      5. 8.1.5 Radio Frequency Interference
      6. 8.1.6 Circuit Stability
  10. 9 Power Supply Recommendations
  11. 10Layout
    1. 10.1 Layout Guidelines
  12. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Device Nomenclature
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Support Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  13. 12Revision History
  14. 13Mechanical, Packaging, and Orderable Information

8.1 Application Information

The XTR115 and XTR116 are identical devices except for the reference voltage output, pin 1. This voltage is available for external circuitry and is not used internally. Further discussions that apply to both devices refer to the XTR11x.

Figure 8-1 shows basic circuit connections with representative simplified input circuitry. The XTR11x is a two-wire current transmitter. The device input signal (pin 2) controls the output current. A portion of this current flows into the V+ power supply, pin 7. The remaining current flows in Q1. External input circuitry connected to the XTR11x can be powered from VREG or VREF. Current drawn from these terminals must be returned to IRET, pin 3. This IRET pin is a local ground for input circuitry driving the XTR11x.

XTR115 XTR116 Basic Circuit Connections
(1) Also see Figure 8-4.
(2) See Section 8.1.1.
Figure 8-1 Basic Circuit Connections

The XTR11x is a current-input device with a gain of 100. A current flowing into pin 2 produces IO = 100 • IIN. The input voltage at the IIN pin is zero (referred to the IRET pin). A voltage input is created with an external input resistor, as shown. Common full-scale input voltages range from 1V and upward. Full-scale inputs greater than 0.5V are recommended to minimize the effect of offset voltage and drift of A1.