SLVSL42B January   2026  – May 2026 OPA2486 , OPA486

PRODMIX  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration 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 for OPA486
    5. 5.5 Thermal Information for OPA2486
    6. 5.6 Thermal Information for OPA4486
    7. 5.7 Electrical Characteristics
    8. 5.8 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 Input Common-Mode Range
      2. 6.3.2 Phase-Reversal Protection
      3. 6.3.3 Chopping Transients
      4. 6.3.4 EMI Rejection
      5. 6.3.5 Electrical Overstress
      6. 6.3.6 MUX-Friendly Inputs
    4. 6.4 Device Functional Modes
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Basic Noise Calculations
    2. 7.2 Typical Applications
      1. 7.2.1 Instrumentation Amplifier
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
        3. 7.2.1.3 Application Curve
      2. 7.2.2 Low Power Instrumentation Amplifier
      3. 7.2.3 Difference Amplifier
      4. 7.2.4 Resistance Temperature Detector (RTD)
    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 Development Support
        1. 8.1.1.1 PSpice® for TI
        2. 8.1.1.2 TINA-TI™ Simulation Software (Free Download)
    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

7.2.4 Resistance Temperature Detector (RTD)

The OPAx486 is an excellent choice in a high precision RTD designs. RTDs are popular for high accuracy and wide temperature range applications. Unfortunately, the RTD resistance change with temperature is not totally linear and some kind of compensation is necessary to get the best results. Figure 7-8 shows a circuit that provides analog compensation for RTDs. Resistors R2, R4, and R3 set the noise gain of the circuit, while the ratio of R3 and R2 set the dc offset for the circuit. Resistor R1 sets the current excitation of the Pt100 RTD, and R5 provides the compensation. The choice of resistors depends on various variables that are discussed in detail in the Analog Linearization of Resistance Temperature Detectors report.

OPA2486 OPA486 OPA4486 RTD Configuration With Linearization Figure 7-8 RTD Configuration With Linearization