1 Features

• 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

2 Applications

• Mechanically scanning LIDAR

• Solid-state scanning LIDAR

• Laser distance meter

• Optical ToF position sensor

• Drone vision

• Industrial robot LIDAR

• Mobile robot LIDAR

• Vacuum robot LIDAR

3 Description

The LMH32401 device is a programmablegain,

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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