Programmable-gain differential-output high-speed transimpedance amplifier

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.