1 Features

? Gain: 20 kΩ

? Performance, CPD = 1 pF:

– Bandwidth: 350 MHz

– Input-referred noise: 56 nARMS

– Rise, fall time: 1.25 ns

? Quiescent current: 28 mA/channel

? Standby mode: 10 mA/channel

? Low power mode: 2.5 mA (4 channels)

? Channel switching time: 10 ns

? Integrated ambient light cancellation

? Integrated 100-mA protection clamp

? 4 Input channels and 4 differential output channels

? Integrated multiplexer enables flexible

configurability between optical sensor and

ADC/TDC

? Multiple LMH32404s can be combined in parallel

to create a wider field-of-view (FoV)

? Package: 28-pin VQFN

– Bare die

? Temperature range: –40°C to +125°C

2 Applications

? Mechanically scanning LIDAR

? Solid-state scanning LIDAR

? Laser distance meter

? Safety area scanner

3 Description

The LMH32404 is a quad-channel, single-ended-input

to differential-output transimpedance amplifier (TIA)

for light detection and ranging (LIDAR) applications

and laser distance measurement systems.

The LMH32404 has an integrated 100-mA clamp on

each channel that protects the amplifier and allows

the device to recover rapidly from an overloaded

input condition. The LMH32404 also features an

integrated ambient light cancellation (ALC) circuit on

each channel that can be used instead of AC coupling

between the photodiode and the amplifier to save

board space and system cost. The ALC loop should

be disabled when DC and low frequency content is

measured.

Each LMH32404 channel has integrated switches

on the output to disconnect the differential output

amplifier from the output pins and put the channel

in standby mode. When switching between different

channels, the transistion time is only 10 ns. The

LMH32404 can be placed in low-power mode using

the EN pin to conserve power when the amplifier is

not being used.