SBOSA56C March   2022  – October 2023 LMH34400

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Electrical Characteristics: Logic Threshold and Switching Characteristics
    7. 5.7 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Clamping and Input Protection
      2. 6.3.2 ESD Protection
      3. 6.3.3 Single-Ended Output Stage
    4. 6.4 Device Functional Modes
      1. 6.4.1 Ambient Light Cancellation Mode
      2. 6.4.2 Power-Down Mode (Multiplexer Mode)
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Applications
      1. 7.2.1 LMH34400 Test Circuit
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
        3. 7.2.1.3 Application Curves
      2. 7.2.2 LMH34400 Signal Chain With Comparator
        1. 7.2.2.1 Design Requirements
        2. 7.2.2.2 Detailed Design Procedure
        3. 7.2.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Development Support
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 Receiving Notification of Documentation Updates
    4. 8.4 Support Resources
    5. 8.5 Trademarks
    6. 8.6 Electrostatic Discharge Caution
    7. 8.7 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • DRL|6
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.2.2 LMH34400 Signal Chain With Comparator

A common application for the LMH34400 is as a transimpedance front-end driving a comparator that can connect to a time-to-digital converter to calculate distances from pulse-based time-of-flight (ToF) measurements. Figure 7-6 shows the test circuit using a commercially available photodiode with 1 pF of pin capacitance and a 2‑GHz cutoff frequency. Select a photodiode with a cutoff frequency far greater than the LMH34400 bandwidth. The photodiode is connected to the LMH34400, which then drives the TLV3601 comparator. Choose a comparator with low input overdrive dispersion to reduce walk error.

GUID-20230208-SS0I-QBN3-SVLV-SQZ15GSJFGB3-low.svgFigure 7-6 LMH34400 Signal Chain With Comparator