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

6.2.6 Input Common-Mode Range

The linear input voltage range of the input circuitry of the INA2128 is from approximately 1.4V less than the positive supply voltage to 1.7V greater than the negative supply. As a differential input voltage causes the output voltage increase, the linear input range is limited by the output voltage swing of amplifiers A1 and A2. Therefore, the linear common-mode input range is related to the output voltage of the complete amplifier. This behavior also depends on supply voltage—see performance curves Figure 5-10 and Figure 5-9.

Input-overload can produce an output voltage that appears normal. For example, if an input overload condition drives both input amplifiers to the positive output swing limit, the difference voltage measured by the output amplifier is near zero. The output of the INA2128 is near 0V even though both inputs are overloaded.

INA2128 Providing an Input Common-Mode Current Path Figure 6-3 Providing an Input Common-Mode Current Path