ZHCSI24O September   2000  – April 2018 LMV7235 , LMV7239

PRODUCTION DATA.  

  1. 特性
  2. 应用
  3. 说明
    1.     Device Images
      1.      电源电流与电源电压间的关系
      2.      传播延迟与过驱动
  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, 2.7 V
    6. 6.6 Electrical Characteristics, 5 V
    7. 6.7 Typical Characteristics
  7. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Input Stage
      2. 7.3.2 Output Stage: LMV7239
      3. 7.3.3 Output Stage: LMV7235
    4. 7.4 Device Functional Modes
      1. 7.4.1 Capacitive and Resistive Loads
      2. 7.4.2 Noise
      3. 7.4.3 Hysteresis
        1. 7.4.3.1 Inverting Comparator With Hysteresis
        2. 7.4.3.2 Non-Inverting Comparator With Hysteresis
      4. 7.4.4 Zero Crossing Detector
        1. 7.4.4.1 Zero Crossing Detector With Hysteresis
      5. 7.4.5 Threshold Detector
  8. Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Square Wave Oscillator
        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 Crystal Oscillator
      3. 8.2.3 Infrared (IR) Receiver
      4. 8.2.4 Window Detector
  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 相关链接
    4. 11.4 接收文档更新通知
    5. 11.5 社区资源
    6. 11.6 商标
    7. 11.7 静电放电警告
    8. 11.8 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

Layout Guidelines

Proper grounding and the use of a ground plane will help to ensure the specified performance of the LMV7235 and LMV72391. Minimizing trace lengths, reducing unwanted parasitic capacitance and using surface-mount components will also help. Comparators are very sensitive to input noise.

The LMV7235 and LMV72391 require a high-speed layout. Follow these layout guidelines:

  1. Use printed-circuit board with a good, unbroken low-inductance ground plane.
  2. Place a decoupling capacitor (0.1-µF, ceramic surface-mount capacitor) as close as possible to VCC pin.
  3. On the inputs and the output, keep lead lengths as short as possible to avoid unwanted parasitic feedback around the comparator. Keep inputs away from output.
  4. Solder the device directly to the printed-circuit board rather than using a socket.
  5. For slow moving input signals, take care to prevent parasitic feedback. A small capacitor (1000 pF or less) placed between the inputs can help eliminate oscillations in the transition region. This capacitor causes some degradation to tPD when the source impedance is low.
  6. The top-side ground plane runs between the output and inputs.
  7. Ground trace from the ground pin runs under the device up to the bypass capacitor, shielding the inputs from the outputs.