ZHCSIQ4B September   2018  – December 2018 OPA828

PRODUCTION DATA.  

  1. 特性
  2. 应用
  3. 说明
    1.     Device Images
      1.      开环增益和相位与频率间的关系
      2.      失调电压漂移
  4. 修订历史记录
  5. Pin Configuration and Functions
    1.     Pin Functions
  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
  7. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Operating Characteristics
      2. 7.3.2  Phase-Reversal Protection
      3. 7.3.3  Electrical Overstress
      4. 7.3.4  MUX Friendly Inputs
      5. 7.3.5  Overload Power Limiter
      6. 7.3.6  Capacitive Load and Stability
      7. 7.3.7  Capacitive Load and Stability
      8. 7.3.8  Settling Time
      9. 7.3.9  Slew Rate
      10. 7.3.10 Full Power Bandwidth
      11. 7.3.11 Small Signal Response
      12. 7.3.12 Thermal Considerations
      13. 7.3.13 Thermal Shutdown
      14. 7.3.14 Low Noise
      15. 7.3.15 Low Offset Voltage Drift
      16. 7.3.16 Overload Recovery
    4. 7.4 Device Functional Modes
      1. 7.4.1 Functional Modes
  8. Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Typical Application: SAR ADC Driver
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Typical Application: Low-Pass Filter
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Application Curve
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    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
    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 术语表
  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

Electrical Overstress

The OPA828 is internally protected against ESD events which can occur during manufacturing, handling, or printed-circuit-board assembly. The internal ESD protection diodes are not intended to protect the OPA828 during normal operation when the device is operating under power. The ESD protection circuitry involves several current-steering diodes connected from the input and output pins and routed back to the internal power-supply lines, where the diodes meet at the power-supply ESD cell, an absorption device, internal to the operational amplifier. This protection circuitry is intended to remain inactive during normal circuit operation. In cases where the inputs or output can be driven above the positive power supply or below the negative power supply care must be taken to limit the current through the internal diodes to 10 mA or less. In harsh electrical environments external protection circuitry may be required and is dependant upon the application requirements and environmental conditions.

OPA828 OPA828_ESD_Protection.gifFigure 43. Equivalent Internal ESD Circuitry

One example of protecting the OPA828 inputs against an input over-voltage condition is illustrated in Figure 44. In this example the non-inverting input to the OPA828 is protected with the addition of an external resistor. If the input voltage, VIN, exceeds either power supply voltage, the input ESD diodes become forward biased at approximately 0.5 V. It is recommended to limit the current through the forward-biased internal ESD diodes under such conditions; see Absolute Maximum Ratings. In this specific example illustrated in Figure 44, the addition of the input resistor provides the necessary current limiting and allows for input voltages at VIN up to ±25.5 V. Assuming a symmetrical, dual power supply configuration, the maximum input voltage for this circuit configuration can be determined from Equation 1:

Equation 1. OPA828 Input_Limiting_Equation.gif
OPA828 Input_Currrent_Limiting.gifFigure 44. Limiting the Input Current

Adding the series input protection resistor as described above will add an additional source of noise to the circuit. Resistance values below 250 Ω contribute less than 10% of additional noise. A resistance value of 1 kΩ increases the noise by approximately by 40%. The OPA828 has an equivalent input noise resistance of approximately 1 kΩ.