Product details


Number of channels (#) 1 GBW (Typ) (MHz) 450 Total supply voltage (Max) (+5V=5, +/-5V=10) 3.45 Total supply voltage (Min) (+5V=5, +/-5V=10) 3 Vos (offset voltage @ 25 C) (Max) (mV) 20 Rail-to-rail No Features Integrated TIA BW @ Acl (MHz) 450 Operating temperature range (C) -40 to 125 open-in-new Find other Transimpedance amplifiers

Package | Pins | Size

VQFN (RGT) 16 9 mm² 3 x 3 open-in-new Find other Transimpedance amplifiers


  • Integrated Programmable Gain: 2 kΩ or 20 kΩ
  • Performance, Gain = 2 kΩ, CPD = 1 pF:
    • Bandwidth: 450 MHz
    • Input-Referred Noise: 250 nARMS
    • Rise, Fall Time: 0.8 ns
  • Performance, Gain = 20 kΩ, CPD = 1 pF:
    • Bandwidth: 275 MHz
    • Input-Referred Noise: 49 nARMS
    • Rise, Fall Time: 1.3 ns
  • Integrated Ambient Light Cancellation
  • Integrated 100-mA Protection Clamp
  • Integrated Output Multiplexer
  • Wide Output Swing: 1.5 VPP
  • Quiescent Current: 30 mA
  • Temperature Range: –40 to +125°C
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The LMH32401 device is a programmable-gain, single-ended, input-to-differential output transimpedance amplifier for light detection and ranging (LIDAR) applications and laser distance measurement systems. The LMH32401 device can be configured in a gain of 2 kΩ or 20 kΩ. The LMH32401 device has 1.5 VPP of output swing and is designed to drive a 100-Ω load.

The LMH32401 device has an integrated 100-mA clamp that protects the amplifier and allows the device to recover rapidly from an overloaded input condition. The LMH32401 device also features an integrated ambient light cancellation circuit that can be used instead of AC coupling between the photodiode and the amplifier to save board space in addition to reducing system cost. The ambient light cancellation circuit can be disabled in cases where DC coupling is required.

The LMH32401 device can be placed in low-power mode using the EN pin to conserve power when the amplifier is not being used. Putting the amplifier in low-power mode places its output pins in a high-impedance state. This feature allows several LMH32401 amplifiers to be multiplexed to a single ADC with the EN control pin serving as the multiplexer select function.

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Technical documentation

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Type Title Date
* Data sheet LMH32401 450-MHz, Programmable Gain, Differential Output Transimpedance Amplifier datasheet (Rev. A) Jun. 25, 2020
Application note Time of Flight and LIDAR - Optical Front End Design Feb. 04, 2020
User guide LMH32401IRGT Evaluation Module Oct. 13, 2019
Technical article What you need to know about transimpedance amplifiers – part 1 May 06, 2016

Design & development

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Hardware development

document-generic User guide
The LMH32401RGTEVM is an evaluation module (EVM) for the LMH32401IRGT differential output transimpedance ampifier. The EVM features a transformer to convert the output to a 50-Ohm single ended connection for easy measurement with standard test equipement, and the option to convert to fully (...)
  • Configured for single-ended voltage input and output with 50-Ohm matched SMA connections
  • Includes options to connect a current input source with bias connections for edge mounting photodiodes
  • Optional DC-coupled differential output configuration
  • Jumpers included for easy control of gain, bias current (...)
document-generic User guide

The TSW12QJ1600 evaluation module (EVM) is used to evaluate the ADC12QJ1600-Q1 analog-to-digital converter (ADC) with different front-end options. ADC12QJ1600-Q1 is a 12-bit ADC capable of operating at sampling rates up to 1.6 gigasample per second (GSPS) with four analog input channels.

This design (...)

  • Flexible transformer-coupled analog input to allow for a variety of sources and frequencies
  • Easy-to-use software GUI to configure two ADC12QJ1600-Q1 parts for a variety of configurations through a USB interface
  • Quickly evaluate ADC performance through high-speed data converter pro software (...)

Design tools & simulation

SBOMB18B.TSC (50 KB) - TINA-TI Reference Design
SBOMB23.TSM (19 KB) - TINA-TI Spice Model
SBOMB24A.ZIP (29 KB) - PSpice Model
SBOMB64B.ZIP (39 KB) - PSpice Model
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  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
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CAD/CAE symbols

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VQFN (RGT) 16 View options

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