ZHCSHU3A March   2018  – January 2021 OPA197-Q1 , OPA2197-Q1 , OPA4197-Q1

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information: OPA197-Q1
    5. 6.5 Thermal Information: OPA2197-Q1
    6. 6.6 Thermal Information: OPA4197-Q1
    7. 6.7 Electrical Characteristics: VS = ±4 V to ±18 V (VS = 8 V to 36 V)
    8. 6.8 Electrical Characteristics: VS = ±2.25 V to ±4 V (VS = 4.5 V to 8 V)
    9. 6.9 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Input Protection Circuitry
      2. 7.3.2 EMI Rejection
      3. 7.3.3 Phase Reversal Protection
      4. 7.3.4 Thermal Protection
      5. 7.3.5 Capacitive Load and Stability
      6. 7.3.6 Common-Mode Voltage Range
      7. 7.3.7 Electrical Overstress
      8. 7.3.8 Overload Recovery
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 16-Bit Precision Multiplexed Data-Acquisition System
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curve
      2. 8.2.2 Slew-Rate Limit for Input Protection
      3. 8.2.3 Precision Reference Buffer
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Development Support
        1. 11.1.1.1 TINA-TI™ Simulation Software (Free Download)
        2. 11.1.1.2 TI Precision Designs
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 接收文档更新通知
    4. 11.4 支持资源
    5. 11.5 Trademarks
    6. 11.6 静电放电警告
    7. 11.7 术语表
  12. 12Mechanical, Packaging, and Orderable Information

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7.3.1 Input Protection Circuitry

The OPAx197-Q1 use a unique input architecture to eliminate the need for input protection diodes but still provide robust input protection under transient conditions. Conventional input diode protection schemes shown in Figure 7-1 can be activated by fast transient step responses, and can introduce signal distortion and settling-time delays because of alternate current paths, as shown in Figure 7-2. For low-gain circuits, these fast-ramping input signals forward-bias back-to-back diodes, causing an increase in input current, and resulting in extended settling time, as shown in Figure 7-3.

GUID-8DD5A7D4-DFDC-4D06-9C82-24481FF9315F-low.gifFigure 7-1 OPAx197-Q1 Input Protection Does Not Limit Differential Input Capability
GUID-7DA8E536-E5FE-4EF6-80A6-C6FBE8485111-low.gifFigure 7-2 Back-to-Back Diodes Create Settling Issues
GUID-9F53FDD7-D6DB-4B8C-9DCC-C9223175D88D-low.gifFigure 7-3 OPAx197-Q1 Protection Circuit Maintains Fast-Settling Transient Response

The OPAx197-Q1 family of operational amplifiers provides a true high-impedance differential input capability for high-voltage applications. This patented input protection architecture does not introduce additional signal distortion or delayed settling time, making these devices the optimal op amps for multichannel, high-switched, input applications. The OPAx197-Q1 tolerate a maximum differential swing (voltage between inverting and noninverting pins of the op amp) of up to 36 V, making these devices an excellent choice for use as comparators or in applications with fast-ramping input signals, such as multiplexed data-acquisition systems; see Figure 8-1.