SBOSAL6A June   2025  – September 2025 XTR200

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configurations and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Explanation of Pin Functions
      2. 6.3.2 Using an External Transistor
      3. 6.3.3 Error Flag
    4. 6.4 Device Functional Modes
      1. 6.4.1 Current-Output Mode
      2. 6.4.2 Voltage-Output Mode
      3. 6.4.3 Output Disabled
      4. 6.4.4 Thermal Shutdown
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Input Voltage
      2. 7.1.2 Miswiring Protection
      3. 7.1.3 Power Dissipation in Current Output Mode
      4. 7.1.4 Estimating Junction Temperature
    2. 7.2 Typical Applications
      1. 7.2.1 Analog Output Circuit for Field Transmitters
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
        3. 7.2.1.3 Application Curves
      2. 7.2.2 Additional Applications
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Third-Party Products Disclaimer
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 Receiving Notification of Documentation Updates
    4. 8.4 Support Resources
    5. 8.5 Trademarks
    6. 8.6 Electrostatic Discharge Caution
    7. 8.7 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information
    1.     53
    2. 10.1 Tape and Reel Information

7.1.1 Input Voltage

The linear input voltage range extends from 0V to 5V. The input voltage is referenced to the grounding point of RSET. Verify that RSET is not distorted from other currents. Assuming a 3V full-scale input signal for a 20mA output current, RSET is 1.5kΩ. A resistance uncertainty of just 1.5Ω already degrades the accuracy to below 0.1%. Select a precision, low-drift resistor for best performance because resistor drift directly converts into drift of the output current. Design the layout carefully to minimize any series resistance with RSET and the input reference point.

Do not drive the input negative (referred to GND) greater than 500mV. Higher negative voltages turn on the internal protection diodes. Insert a resistor in series with the input if negative signals can occur during power on, power off, or other transient conditions.

Use a voltage divider to add an offset voltage to the input voltage for a 4mA to 20mA signaling range as shown in Figure 7-1. In this approach, an offset voltage is derived from a voltage reference and voltage divider, such that the XTR200 delivers 4mA to the load when the DAC output voltage is 0V, preserving DAC resolution.

XTR200 Adding an Offset Voltage to the XTR200 Input for 4mA to 20mA SignalingFigure 7-1 Adding an Offset Voltage to the XTR200 Input for 4mA to 20mA Signaling

Use Equation 5 to calculate the offset voltage, VOS, required for a 4mA output.

Equation 5. VOS=4mA×RSET10

When the necessary offset voltage is calculated, calculate the values of R1 and R2 using the equation:

Equation 6. VOS=VREF×R2R1+R2

Consider the minimum output voltage of the DAC when designing this circuit. Some DACs do not reach all the way to 0V.