SBOS035C December   1995  – January 2026 INA2128

PRODUCTION DATA  

  1.   1
  2. 1Features
  3. 2Applications
  4. 3Description
  5. 4Pin Configuration and Functions
  6. 5Specifications
    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. 6Application and Implementation
    1. 6.1 Application Information
    2. 6.2 Typical Application
      1. 6.2.1 Setting The Gain
      2. 6.2.2 Dynamic Performance
      3. 6.2.3 Noise Performance
      4. 6.2.4 Offset Trimming
      5. 6.2.5 Input Bias Current Return Path
      6. 6.2.6 Input Common-Mode Range
      7. 6.2.7 Low-Voltage Operation
      8. 6.2.8 Input Protection
      9. 6.2.9 Channel Crosstalk
  8. 7Device and Documentation Support
    1. 7.1 Device Nomenclature
    2. 7.2 Receiving Notification of Documentation Updates
    3. 7.3 Support Resources
    4. 7.4 Trademarks
    5. 7.5 Electrostatic Discharge Caution
    6. 7.6 Glossary
  9. 8Revision History
  10. 9Mechanical, Packaging, and Orderable Information

6.2.8 Input Protection

The inputs of the INA2128 are individually protected for voltages up to ±40V. For example, a condition of –40V on one input and +40V on the other input does not cause damage. Internal circuitry on each input provides low series impedance under normal signal conditions. To provide equivalent protection, series input resistors contribute excessive noise. If the input is overloaded, the protection circuitry limits the input current to a safe value of approximately 1.5mA to 5mA. The typical performance curve “Input Bias Current vs Common-Mode Input Voltage” shows this input current limit behavior. The inputs are protected even if the power supplies are disconnected or turned off.

INA2128 Two-Axis Bridge Amplifier Figure 6-4 Two-Axis Bridge Amplifier