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

3 Description

The LMH34400 is the industries' smallest, fixed-gain, single-ended transimpedance amplifier for light detection and ranging (LIDAR) applications and laser distance measurement systems. The LMH34400 produces 1.0 VPP of output swing and has an input-referred noise of 50 nARMS.

The LMH34400 has an integrated 100‑mA clamp that protects the amplifier and allows the device to recover rapidly from an overloaded input condition. The LMH34400 also features an integrated ambient light cancellation (ALC) circuit that can be used instead of ac coupling between the photodiode and the amplifier to save board space and system cost. Disable the ALC loop in cases where the frequency signal content to be measured is less than 400 kHz.

When the amplifier is not being used, the LMH34400 can be placed in low-power mode using the EN pin to conserve power. This feature allows several LMH34400 amplifiers to be multiplexed to the input of the next stage of the receive signal chain with the EN control pin serving as the multiplexer select function. The LMH34400 offers a single-ended output and is optimized for use with time-to-digital converter (TDC) based LIDAR systems.

Package Information
PART NUMBER PACKAGE(1) PACKAGE SIZE(2)
LMH34400 DRL (SOT5X3, 6) 1.6 mm × 1.6 mm
(1) For more information, see Section 10.
(2) The package size (length × width) is a nominal value and includes pins, where applicable.

 

GUID-20230925-SS0I-WX03-5FQW-DMPQ50XGNVNW-low.svgSimplified Block Diagram
GUID-20220122-SS0I-Z8NH-QVPQ-2X1NRRFW0QXJ-low.svgTransimpedance Bandwidth vs Frequency