SBOS936E November   2019  – August 2022 OPA182 , OPA2182 , OPA4182

PRODMIX  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information: OPA182
    5. 7.5 Thermal Information: OPA2182
    6. 7.6 Thermal Information: OPA4182
    7. 7.7 Electrical Characteristics
    8. 7.8 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Phase-Reversal Protection
      2. 8.3.2 Input Bias Current Clock Feedthrough
      3. 8.3.3 EMI Rejection
      4. 8.3.4 Electrical Overstress
      5. 8.3.5 MUX-Friendly Inputs
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Strain Gauge Analog Linearization
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Rogowski Coil Integrator
      3. 9.2.3 System Examples
        1. 9.2.3.1 24-Bit, Delta-Sigma, Differential Load Cell or Strain Gauge Sensor Signal Conditioning
      4. 9.2.4 Programmable Power Supply
      5. 9.2.5 RTD Amplifier With Linearization
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
  10. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 Development Support
        1. 10.1.1.1 PSpice® for TI
        2. 10.1.1.2 TINA-TI™ Simulation Software (Free Download)
        3. 10.1.1.3 TI Reference Designs
    2. 10.2 Documentation Support
      1. 10.2.1 Related Documentation
    3. 10.3 Receiving Notification of Documentation Updates
    4. 10.4 Support Resources
    5. 10.5 Trademarks
    6. 10.6 Electrostatic Discharge Caution
    7. 10.7 Glossary
  11. 11Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

9.2.2 Rogowski Coil Integrator

Figure 9-6 shows the OPA2182 configured as an active integrator, level shifter and precision voltage reference buffer for a Rogowski coil used to indirectly measure the current of a protection relay with high accuracy. This design has two main signal paths: the first path is used to accurately measure the current flowing through the Rogowski coil, and a second high-speed path is used to detect a fast transient such as a short circuit. The OPA2182 is selected for this application thanks to the low offset voltage (0.45 µV) and offset drift (0.003 µV/°C) that minimize calibration requirements and maintain higher accuracy across the full temperature range. This device also features flat noise across a wide frequency range which includes dc which improves accuracy and repeatability across a wide range of input currents from the Rogowski coil. Additional information on this design can be found in the Active Integrator for Rogowski Coil Reference Design with Improved Accuracy for Relay and Breaker.

GUID-AD9F9DA7-4EFD-467E-AB07-5A834E143728-low.gifFigure 9-6 Programmable Power Supply