Texas Instruments LMH32401/LMH32401-Q1 Transimpedance Amplifier
Texas Instruments LMH32401/LMH32401-Q1 High-Speed Transimpedance Amplifier is a programmable-gain, single-ended, input-to-differential output transimpedance amplifier. The device is ideal for light detection and ranging (LIDAR) applications and laser distance measurement systems. The Texas Instruments LMH32401/LMH32401-Q1 device can be configured in a gain of 2kΩ or 20kΩ. The LMH32401/LMH32401-Q1 device has 1.5VPP of output swing and is designed to drive a 100Ω load.
The LMH32401/LMH32401-Q1 device has an integrated 100mA clamp that protects the amplifier and allows it to recover rapidly from an overloaded input condition. It 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 and reduce system costs. The ambient light cancellation circuit can be disabled in cases where DC coupling is required.
The LMH32401/LMH32401-Q1 device can be placed in low-power mode using the EN pin to conserve power when the amplifier is unused. Putting the amplifier in low-power mode places its output pins in a high-impedance state. This feature allows several LMH32401/LMH32401-Q1 amplifiers to be multiplexed to a single ADC, with the EN control pin serving as the multiplexer select function. The LMH32401-Q1 devices are AEC-Q100 qualified for automotive applications.
Features
- 2kΩ or 20kΩ integrated programmable gain
- Performance (Gain = 2kΩ, CPD = 1pF)
- 450MHz bandwidth
- 250nARMS input-referred noise
- 0.8ns rise, fall time
- Performance (Gain = 20kΩ, CPD = 1pF)
- 275MHz bandwidth
- 49nARMS input-referred noise
- 1.3ns rise, fall time
- Integrated ambient light cancellation
- Integrated 100mA protection clamp
- Integrated output multiplexer
- 1.5VPP wide output swing
- 30mA quiescent current
- –40 to +125°C temperature range
Applications
- Mechanically scanning LIDAR
- Solid-State scanning LIDAR
- Laser distance meter
- Optical ToF position sensor
- Drone vision
- Industrial robot LIDAR
- Mobile robot LIDAR
- Vacuum robot LIDAR
Datasheets
Functional Block Diagram
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