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 Rating Catalog
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 Rating Catalog
VQFN (RGT) 16 9 mm² 3 x 3
  • 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
  • Packages: 16-pin VQFN and bare die
  • Temperature range: –40 to +125°C
  • 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
  • Packages: 16-pin VQFN and bare die
  • Temperature range: –40 to +125°C

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.

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. C) PDF | HTML 08 Aug 2022
Application note Time of Flight and LIDAR - Optical Front End Design (Rev. A) PDF | HTML 29 Apr 2022
User guide LMH32401IRGT Evaluation Module 13 Oct 2019
Technical article What you need to know about transimpedance amplifiers – part 1 06 May 2016

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LMH32401RGTEVM — LMH32401 transimpedance amplifier evaluation module

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 (...)
User guide: PDF
Not available on TI.com
Evaluation board

TSW12QJ1600EVM — ADC12QJ1600-Q1 8-ch (two synchronized 4-ch) 12-bit 1.6-GSPS JESD204C interface ADC evaluation module

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 (...)

Not available on TI.com
Simulation model

LMH32401 TINA-TI Model (Rev. C)

SBOMB18C.TSC (9729 KB) - TINA-TI Reference Design
Simulation model

LMH32401 TINA-TI SPICE Model

SBOMB23.TSM (19 KB) - TINA-TI Spice Model
Simulation model

LMH32401 P-SPICE Model (Rev. A)

SBOMB24A.ZIP (29 KB) - PSpice Model
Simulation model

LMH32401 for PSpice Library (Rev. B)

SBOMB64B.ZIP (39 KB) - PSpice Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Simulation tool

TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
User guide: PDF
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