SBOSA63A December   2020  – November 2021 LMH32404-Q1

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and 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
    5. 6.5 Electrical Characteristics
    6. 6.6 Electrical Characteristics: Logic Threshold and Switching Characteristics
    7. 6.7 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 Clamping and Input Protection
      2. 7.3.2 ESD Protection
      3. 7.3.3 Differential Output Stage
    4. 7.4 Device Functional Modes
      1. 7.4.1 Ambient Light Cancellation (ALC) Mode
      2. 7.4.2 Channel Multiplexer Mode
      3. 7.4.3 Low-Power Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Standard TIA Application
        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 Increase Channel Density for Optical Front-End Systems
        1. 8.2.2.1 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Development Support
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Support Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.1 Overview

The LMH32404-Q1 is a quad-channel, differential output, high-speed transimpedance amplifier (TIA) geared towards light detection and ranging (LIDAR) and laser distance measurement systems. Each LMH32404-Q1 channel has integrated switches on the output to disconnect the differential output amplifier from the output pins. This enables the LMH32404-Q1 to be highly configurable in a multi-channel LIDAR system. The LMH32404-Q1 device is designed to work with photodiodes (PDs), for example avalanche photodiodes (APDs), connected in configurations that can source or sink the current. When the photodiode sinks the photocurrent (anode is biased to a negative voltage and cathode is tied to the amplifier input) the fast recovery clamp activates when the amplifier input is overloaded. When the photodiode sources the photocurrent (cathode is biased to a positive voltage and anode is tied to the amplifier input) a soft clamp activates when the amplifier input is overloaded. When the soft clamp activates the amplifier takes longer to recover. The recovery time depends on the level of input overload. The LMH32404-Q1 is offered in a space-saving 5-mm × 4-mm, 28-pin VQFN package and is rated over a temperature range from –40°C to +125°C.