LMH32401IRGTT

Overview

The LMH32401IRGTT is a programmable-gain, single-ended input to differential output transimpedance amplifier from Texas Instruments. It features integrated ambient light cancellation and a 100-mA protection clamp for rapid recovery from overload. The device operates on a 3V to 3.45V supply with a quiescent current of 30mA. It supports gain configurations of 2kΩ or 20kΩ, offering bandwidths of 450MHz and 275MHz respectively. Designed for LIDAR and laser distance measurement systems, it includes an integrated output multiplexer and low-power shutdown mode.

Feature Summary

• Integrated programmable gain selectable between 2kΩ and 20kΩ
• Built-in ambient light cancellation circuit to replace AC coupling
• Integrated 100-mA protection clamp for overload recovery
• Low-power shutdown mode via EN pin

Applications

• Mechanically scanning LIDAR
• Solid-state scanning LIDAR
• Laser distance meter
• Optical ToF position sensor

Procurement Notes

Verify the specific ordering suffix IRGTT against the manufacturer's official package option addendum to confirm the exact physical package type and tape-and-reel specifications. Ensure that the component matches the intended application requirements regarding gain settings and power supply voltage ranges before finalizing procurement decisions.

Selection Notes

Select this component when designing optical front-ends requiring high-speed signal processing with minimal board space. The integrated ambient light cancellation simplifies design by removing external AC coupling components. Consider the trade-off between the 2kΩ and 20kΩ gain settings based on required bandwidth and noise performance for the specific photodiode configuration.

Part Context

This device belongs to the LMH32401 family of high-speed transimpedance amplifiers. It is designed specifically for light detection and ranging (LIDAR) applications and laser distance measurement systems. The family offers programmable gain and integrated features to optimize system performance in compact form factors.

Replacement Considerations

LMH32401-Q1

FAQ

How does the device handle ambient light interference?

The LMH32401 includes an integrated ambient light cancellation circuit that can be used instead of AC coupling between the photodiode and the amplifier, saving board space and reducing system cost.

What happens when the amplifier is placed in low-power mode?

When the EN pin is driven high, the device enters a low-power mode where the output pins are placed in a high-impedance state, allowing multiple amplifiers to be multiplexed to a single ADC.