ET75116 3A 3D iTOF Laser Driver: Enabling Accurate and Reliable Depth Sensing

As 3D sensing applications continue to expand, Indirect Time-of-Flight (iTOF) technology has become a key solution for smartphones, AR/VR devices, robotics, and industrial vision systems. At the core of every iTOF module is a high-performance Laser Driver, which controls the VCSEL to deliver high speed modulation, stable optical output and high-precision depth accuracy.

To meet the growing demand for compact, reliable, and highly integrated optical systems, ETEK introduces the ET75116 Laser Driver. Designed specifically for 3D iTOF applications, the ET75116 combines intelligent laser control, comprehensive protection features, and up to 3A drive capability in a compact WLCSP25 package, helping engineers simplify system design while improving overall performance.

Why a High-Performance Laser Driver Is Critical for 3D iTOF Systems

An iTOF system measures distance by emitting infrared laser pulses and calculating the time required for the reflected light to return to the sensor. While the iTOF image sensor receives much of the attention, the quality of the emitted laser signal largely determines the accuracy of the entire system.

A high-performance Laser Driver ensures that the VCSEL operates with stable optical power, precise current control, and consistent performance throughout changing temperatures and operating environments.

Stable VCSEL Drive Improves Measurement Accuracy

Even slight fluctuations in VCSEL optical power directly degrade ranging accuracy and spatial depth resolution. As ambient temperature changes or the VCSEL ages over time, maintaining consistent optical power becomes increasingly challenging.

The ET75116 addresses this issue through integrated Automatic Power Control (APC), which continuously monitors laser output and automatically adjusts drive current to maintain stable optical performance. This intelligent feedback mechanism helps ensure reliable depth sensing throughout the product’s lifecycle.

Intelligent Current Control Optimizes System Performance

Besides optical power stability, precise current regulation is equally important.

The ET75116 integrates Automatic Current Control (ACC) to accurately regulate the VCSEL driving current. This minimizes output variations, improves repeatability, and allows the laser to operate efficiently under different application conditions.

By combining integrated APC and ACC closed-loop control, the ET75116 mitigates temperature-induced drift and diode aging, delivering highly stable laser performance for demanding 3D sensing applications.

Key Features and Specifications of the ET75116 Laser Driver

Designed for high-performance 3D iTOF systems, the ET75116 Laser Driver combines flexible power architecture, powerful driving capability, intelligent control functions, and comprehensive protection features into a compact WLCSP25 package. Its specifications are optimized for VCSEL-based depth sensing applications while simplifying overall hardware design.

1.Power Supply Range

The ET75116 supports multiple supply rails to accommodate various system architectures:

– AVCC33 = DVCC33: 3.0V–3.6V

– LDVCC: 3.0V–5.5V

– VCC18: 1.2V / 1.8V

This flexible power configuration enables easy integration into modern smartphones, AR/VR devices, and other compact optical systems.

2.Flexible Laser Driving Capability

To support different VCSEL configurations, the ET75116 Laser Driver provides universal driving capability with support for:

– Common-anode laser driving

– Floating laser driving

This flexibility allows engineers to optimize circuit design based on different optical module architectures.

3.LED Infrared Remote Control Mode

Beyond 3D iTOF applications, the ET75116 also supports an LED infrared remote control mode. By sharing the VCSEL, driver, and SPI interface, manufacturers can reduce BOM cost and PCB space while enabling infrared control functions in consumer electronics.

4.High Output Drive Current

The ET75116 delivers a maximum output current of 3A, providing sufficient driving capability for demanding VCSEL applications that require stable, high-power infrared emission.

5.Integrated LVDS Input Fail-Safe Function

To improve communication reliability between the image sensor and the driver, the device integrates an LVDS input fail-safe function, helping maintain stable operation even under abnormal signal conditions.

6.Intelligent APC and ACC Control

The ET75116 integrates both:

– Automatic Power Control (APC)

– Automatic Current Control (ACC)

These intelligent control mechanisms continuously regulate laser output, helping maintain consistent optical performance under changing temperatures and operating conditions.

7.Comprehensive Protection Functions

To improve system reliability, the ET75116 integrates multiple protection mechanisms, including:

– Overcurrent Detection (OCP)

– APC Error Detection

– Diffuser Removal Detection

These features help protect both the VCSEL and the overall optical module during operation.

8.Built-in Temperature Monitoring

The device includes a 10-bit ADC temperature monitor, enabling continuous thermal monitoring for improved laser stability and system reliability.

9.SPI Interface

The ET75116 communicates through an SPI interface that is fully compatible with both 1.2V and 1.8V logic levels, simplifying integration with today’s mainstream processors and sensor platforms.

Beyond 3D Sensing: Expanding Application Possibilities

Although the ET75116 is primarily designed for 3D iTOF systems, its capabilities extend well beyond traditional depth sensing applications.

– Mobile & Biometrics: Enable high-precision secure facial and 3D portrait bokeh in smartphones.

– AR/VR & Spatial Computing: Powers responsive gesture recognition and real-time environment mapping.

– Industrial Automation & Robotics: Ideal for AGV/AMR navigation,obstacle detection and machine vision.

– One particularly innovative feature is its support for Infrared Remote Control Mode.

Traditional consumer electronics often require separate hardware for ToF sensing and infrared remote control. The ET75116 allows both functions to share a single VCSEL, one Laser Driver, and a common SPI interface. This integrated architecture reduces BOM cost, saves PCB space, and simplifies hardware development.

In addition, the solution supports 360-degree omnidirectional infrared control, providing a wider field of view compared with conventional remote-control implementations.

Conclusion

The ET75116 Laser Driver combines intelligent laser control, up to 3A drive capability, comprehensive protection features, and a compact WLCSP25 package to help engineers build reliable, high-performance 3D iTOF systems. Whether you’re developing smartphones, AR/VR devices, industrial vision equipment, or other VCSEL-based applications, the ET75116 offers an efficient and highly integrated solution.

Ready to optimize your next optical sensing design? Visit the ET75116 product page, request a sample, or contact the ETEK technical team to learn how the ET75116 Laser Driver can support your next project.

Website: https://www.etekmicro.com/products/driver/tof-driver/itof-driver/et75116/

Request Sample: https://www.etekmicro.com/sample/

Frequently Asked Questions

What is a Laser Driver used for in an iTOF system?

A Laser Driver controls the VCSEL’s output current and optical power, ensuring stable infrared illumination for accurate depth sensing.

What is the maximum output current of ET75116 Laser Driver?

The ET75116 supports a maximum laser drive current of 3A, making it suitable for demanding VCSEL applications.

Which applications can benefit from the ET75116 Laser Driver?

The ET75116 is designed for smartphones, facial recognition, AR/VR devices, robotics, industrial vision systems, 3D scanning, gesture recognition, and infrared remote control.