SBOU034B February   2006  – October 2025 XTR300

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 XTR300EVM Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 Evaluation Setup
    2. 2.2 Jumper Configuration Settings
    3. 2.3 Features
      1. 2.3.1 Input Signal
      2. 2.3.2 Reference Voltage
      3. 2.3.3 XTR300EVM Output
      4. 2.3.4 Error Flags
      5. 2.3.5 IMON: Current Monitor Output
      6. 2.3.6 IAOUT: Voltage Monitor
      7. 2.3.7 Other Test Points
    4. 2.4 Output Mode Configurations
      1. 2.4.1 Current Mode Configurations
        1. 2.4.1.1 Single-Ended Current Output
        2. 2.4.1.2 Bidirectional Current Output
        3. 2.4.1.3 Verifying Acceptable Load in Current Mode
      2. 2.4.2 Voltage Mode Configurations
        1. 2.4.2.1 Single-Ended Voltage Output
        2. 2.4.2.2 Bidirectional Voltage Output
        3. 2.4.2.3 Verifying Acceptable Load in Voltage Mode
    5. 2.5 Power Requirements
  8. 3Hardware Design Files
    1. 3.1 Schematic
    2. 3.2 XTR300EVM Top Layer Silkscreen
    3. 3.3 Bill of Materials
  9. 4Additional Information
    1. 4.1 Trademarks
  10. 5Related Documentation
  11. 6Revision History

2.3.6 IAOUT: Voltage Monitor

The XTR300 has an internal instrumentation amplifier that can be used to monitor the output voltage when in current mode operation by looking at the IAOUT pin. The IAOUT pin has a transfer function as shown in Equation 3.

Equation 3. IA O U T = 2 × ( I A I N + - I A I N - ) RG

By default, the RG resistor is set to 10kΩ.

To convert IAOUT to a voltage, a resistor (R14) is used as seen in Equation 4. By default R14 is 750Ω.

Equation 4. V IAOUT = IAOUT × R14

The test point labeled IAOUT allows for easy to read monitoring of the IAOUT pin.