ZHCSMO3C June   2020  – April 2021 OPA2863 , OPA863

PRODUCTION DATA  

  1. 特性
  2. 应用
  3. 说明
  4. Revision History
  5. Device Comparison Table
  6. Pin Configuration and Functions
  7. Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information: OPA863
    5. 7.5  Thermal Information: OPA2863
    6. 7.6  Electrical Characteristics: 10 V
    7. 7.7  Electrical Characteristics: 3 V
    8. 7.8  Typical Characteristics: VS = 10 V
    9. 7.9  Typical Characteristics: VS = 3 V
    10. 7.10 Typical Characteristics: VS = 3 V to 10 V
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Input Stage
      2. 8.3.2 Output Stage
        1. 8.3.2.1 Overload Power Limit
      3. 8.3.3 ESD Protection
    4. 8.4 Device Functional Modes
      1. 8.4.1 Power-Down Mode
      2. 8.4.2 Split-Supply Operation (±1.35 V to ±6.3 V)
      3. 8.4.3 Single-Supply Operation (2.7 V to 12.6 V)
  9. Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Amplifier Gain Configurations
    2. 9.2 Low-Side Current Sensing
      1. 9.2.1 Design Requirements
    3. 9.3 Transimpedance Amplifier
      1. 9.3.1 Design Requirements
      2. 9.3.2 Detailed Design Procedure
      3. 9.3.3 Application Curves
    4. 9.4 Low-Power SAR ADC Driver and Reference Buffer
    5. 9.5 Front-End Gain and Filtering
    6. 9.6 Clamp-On Ultrasonic Flow Meter
    7. 9.7 Variable Reference Generator Using MDAC
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Thermal Considerations
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 接收文档更新通知
    3. 12.3 支持资源
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

Low-Power SAR ADC Driver and Reference Buffer

Figure 9-8 shows the use of the OPAx863 devices as a SAR ADC input driver and reference buffer driving the ADS7945. Sensors, which are used for interface with the physical environment, exhibit high output impedance and cannot drive SAR ADC inputs directly. A wide-GBW amplifier like the OPAx863 devices are needed to charge the switching capacitors at the SAR ADC input and to settle fast to the required accuracy within the given acquisition time. The ADC core draws transient current from the reference input during the conversion (digitization) phase, which needs to be driven with a wide-GBW amplifier to offer fast settling and maintain a stable reference voltage for superior digitization performance. The OPAx863 devices reference buffer is used in a composite loop with the OPA378 precision amplifier due to limitations in precision performance of wide-GBW amplifiers. The precision amplifier maintains low-offset output, whereas the OPAx863 devices provide the output drive and fast-settling performance.

GUID-1ECE5478-22CE-4F7B-AFF2-B6747296C73B-low.gifFigure 9-8 OPAx863 as Low-Power SAR ADC Driver