SBOSAN2A August   2025  – December 2025 PGA854

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Gain Control
      2. 7.3.2 Input Protection
      3. 7.3.3 Output Common-Mode Pin
      4. 7.3.4 Using the Fully Differential Output Amplifier to Shape Noise
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Linear Operating Input Range
      2. 8.1.2 Current Consumption with Differential Inputs
    2. 8.2 Typical Application
      1. 8.2.1 ADS127L11 and ADS127L21B, 24-Bit, Delta-Sigma ADC Driver Circuit
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Development Support
        1. 9.1.1.1 PSpice® for TI
        2. 9.1.1.2 TINA-TI™ Simulation Software (Free Download)
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Electrostatic Discharge Caution
    7. 9.7 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

7.3.2 Input Protection

The inputs of the PGA854 are individually protected for voltages up to ±40V beyond either supply. For example, an input common-mode voltage anywhere between –55V and +55V does not cause damage when powered from ±15V supplies. Internal circuitry on each input provides low series impedance under normal signal conditions, thus maintaining high performance under normal operating conditions. If the input is overloaded, the protection circuitry limits the input current to a value of approximately 4.8mA. Figure 7-2 shows the input protection functionality during an overvoltage condition on IN+ or IN- inputs.

PGA854 Input Current vs Input OvervoltageFigure 7-2 Input Current vs Input Overvoltage

Figure 7-3 shows that during an input overvoltage condition, current flows through the input protection diodes into the power supplies. In applications where the power supplies are unable to sink current, place Zener diode clamps (ZD1 and ZD2) on the power supplies to provide a current pathway to ground.

PGA854 Input Current Path During an Overvoltage ConditionFigure 7-3 Input Current Path During an Overvoltage Condition