ZHCSIQ3B September   2018  – June 2019 OPA2156

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Device Images
      1.      低输入电压噪声频谱密度
      2.      OPA2156 跨阻配置
  4. 4 修订历史记录
  5. 5 Pin Configuration and Functions
    1.     Pin 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: OPA2156
    5. 6.5 Electrical Characteristics
    6. 6.6 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 Phase Reversal Protection
      2. 7.3.2 Electrical Overstress
      3. 7.3.3 Thermal Considerations
      4. 7.3.4 Thermal Shutdown
      5. 7.3.5 Common-Mode Voltage Range
      6. 7.3.6 Overload Recovery
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Slew Rate Limit for Input Protection
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Power Dissipation
    2. 10.2 Layout Example
  11. 11器件和文档支持
    1. 11.1 器件支持
      1. 11.1.1 开发支持
        1. 11.1.1.1 TINA-TI（免费软件下载）
        2. 11.1.1.2 TI 高精度设计
    2. 11.2 文档支持
      1. 11.2.1 相关文档
    3. 11.3 接收文档更新通知
    4. 11.4 社区资源
    5. 11.5 商标
    6. 11.6 静电放电警告
    7. 11.7 Glossary
  12. 12机械、封装和可订购信息

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

8.2.2 Detailed Design Procedure

In this example the OPA2156 serves as a transimpedance amplifier for a differential photodiode. The differential configuration allows for a wider output range (0 to 10-V differential) compared to a single-ended configuration (0 V to 5 V). This output can be connected to a differential successive approximation register (SAR) analog-to-digital converter (ADC). The basic equation for a differential transimpedance amplifier output voltage is shown in Equation 3.

Equation 3. OPA2156 Eq3-Transimpedance.gif

Equation 3 can be rearranged to calculate the value of the feedback resistors as shown in Equation 4.

Equation 4. OPA2156 Eq4-Feedback_Resistor.gif

Adding a capacitor to the feedback loop creates a filter which will remove undesired noise beyond its cutoff frequency. For this application a 1-MHz cutoff frequency was selected. The equation for an RC filter is provided in Equation 5.

Equation 5. OPA2156 Eq5-Cutoff_Frequency.gif

Rearranging this equation to solve for the capacitor value is show in Equation 6.

Equation 6. OPA2156 Eq6-Feedback_Capacitor.gif

For more information on photodiode transimpedance amplifier system design and for a single-ended example, see TIDU535: 1 MHz, Single-Supply, Photodiode Amplifier Reference Design.