LMH32401-Q1

Overview

The LMH32401-Q1 is an automotive-grade, single-ended-input to differential-output transimpedance amplifier. It features programmable gain of 2 kΩ or 20 kΩ and operates within a supply voltage range of 3 V to 3.45 V. At the 2 kΩ gain setting, it provides a bandwidth of 450 MHz with a slew rate of 1100 V/µs and input-referred noise of 250 nARMS. The 20 kΩ gain configuration offers a bandwidth of 275 MHz, a slew rate of 700 V/µs, and input-referred noise of 49 nARMS. The device includes integrated ambient light cancellation, a 100-mA protection clamp, and an output multiplexer.

Feature Summary

• Integrated ambient light cancellation circuit for direct photodiode coupling
• Built-in 100-mA protection clamp for rapid recovery from overload conditions
• Configurable low-power shutdown mode via EN pin

Applications

• Mechanically scanning LIDAR
• Solid-state scanning LIDAR
• Industrial robot LIDAR
• Smart munitions

Procurement Notes

Verify that the component carries the Q1 suffix to confirm AEC-Q100 qualification for automotive environments. Ensure the package matches the specified 16-pin wettable-flank VQFN (RGT) form factor. Confirm that the operating temperature range meets the required –40°C to +125°C specification for your application.

Selection Notes

Select this device when high-speed signal processing is required for LiDAR systems. The choice between 2 kΩ and 20 kΩ gain depends on the specific photodiode capacitance and desired bandwidth. Consider the integrated ambient light cancellation if board space constraints prevent the use of external AC coupling components.

Part Context

This part belongs to the LMH32401 family of high-speed transimpedance amplifiers. The LMH32401-Q1 variant is specifically qualified for automotive applications under AEC-Q100 standards. It serves as a specialized solution for converting optical signals into electrical data in demanding sensing environments.

Replacement Considerations

LMH32401YR

FAQ

How does the device handle ambient light interference?

The LMH32401-Q1 includes an integrated ambient light cancellation loop that can be enabled via the IDC_EN pin. This allows the system to cancel DC current from ambient light without requiring external AC coupling.

What happens when the amplifier is disabled?

When the EN pin is driven high, the device enters a low-power mode. In this state, the quiescent current drops significantly, and the output pins enter a high-impedance state.