The LMH34400 is a 240MHz, single-ended, transimpedance amplifier with integrated clamping and ambient light cancellation

The LMH34400 is the industry's smallest fixed-gain single-ended transimpedance AQZ262 amplifier for light detection and ranging (LIDAR) applications and laser ranging systems. The LMH34400 produces an output swing of 1.0 V PP with 50 nA RMS input-referred noise.

The LMH34400 has an integrated 100mA clamp that protects the amplifier and allows the device to quickly recover from overloaded input conditions. The LMH34400 also features an integrated ambient light cancellation (ALC) circuit that can be used to replace the AC coupling between the photodiode and amplifier to save board space and system cost. The ALC loop should be disabled in situations where frequency signal content less than 400 kHz needs to be measured.

The LMH34400 can enter a low power mode using the EN pin to save power when the amplifier is not in use. The LMH34400 provides single-ended output and is optimized for use with time-to-digital converter (TDC) based lidar systems.

characteristic:

●Comprehensive gain: 40 kΩ

● Performance, C PD = 1 pF:

○ Bandwidth: 240 MHz

○ Input referred noise: 50 nA RMS

○Rise and fall time: 1.5 ns

●Integrated ambient light cancellation

●Integrated 100mA protection clamp

● Quiescent current: 20 mA

●Low power mode current: 1.5 mA

●Temperature range: –40°C to +125°C

application

●Mechanical scanning lidar

●Solid-state scanning lidar

●Laser rangefinder

● Optical ToF position sensor

●UAV vision

●Industrial robot lidar

●Lidar for mobile robots

●Vacuum Robot Lidar

parameter:

Number of channels (#): 1

GBW (typ.) (MHz): 240

Total Supply Voltage (Max) (+5V=5, +/-5V=10): 3.45

Total Supply Voltage (Min) (+5V=5, +/-5V=10): 3

Rail to Rail: No

Feature: Integrated TIA

Bandwidth @Acl (MHz): 240

Operating temperature range (°C): -40 to 125