ZHCSMO3D June   2020  – July 2021 OPA2863 , OPA4863 , 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  热性能信息:OPA4863
    7. 7.7  Electrical Characteristics: 10 V
    8. 7.8  Electrical Characteristics: 3 V
    9. 7.9  Typical Characteristics: VS = 10 V
    10. 7.10 Typical Characteristics: VS = 3 V
    11. 7.11 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 术语表
  13. 13Mechanical, Packaging, and Orderable Information

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机械数据 (封装 | 引脚)
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订购信息

Clamp-On Ultrasonic Flow Meter

Figure 9-10 shows how ultrasonic flow meters measure the rate of flow of a liquid using transit-time difference (t12–t21), which depends on the flow rate. Figure 9-10 shows a representative schematic for a non-intrusive ultrasonic flow meter using the OPAx863 devices and 12-V transducer excitation. The OPAx863 devices are used for the forward path as a unity-gain buffer for 12-V pulsed transducer excitation at Node 1. At the same time, the receiver circuit at Node 2, also using the OPAx863 devices, first provides an AC-gain followed by a DC-level shift to lead to the PGA, ADC and processing within the MSP430 microcontroller.

Node 2 and Node 1 use similar transmit and receive circuits (discussed above) for the reverse path. The OPAx863 devices wide GBW of 50 MHz introduces minimal phase-delay and low-noise for superior flow rate measurement. The amplifier stays in power-down mode for a majority of the time in battery powered systems, resulting in very small average system-level power consumption and prolonged battery lifetime with its 1.4 µA (maximum) power-down mode quiescent current. Since the transmit and receive signal chains are connected to the same point at the respective node transducers, the OPAx863's 12.6-V supply voltage capability enables 12-V transducer excitation without any damage to the front-end or need for external switches which makes a compact solution. This makes the OPAx863 devices suitable for flow measurements in large diameter pipes and non-intrusive flow meters.

GUID-76FEEB03-A2DE-455F-A925-B66249FDBF0B-low.gifFigure 9-10 Non-Intrusive Ultrasonic Flow Meter