ONET4211LDRGET Integrated Circuits (ICs)

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PMIC - Laser Drivers

ONET4211LDR is a four-string linear laser driver from ON Semiconductor, which is a power management integrated circuit (PMIC) that is designed for driving laser devices such as VCSEL and edge-emitting LED lasers in optical power systems. This driver uses a low voltage differential signaling (LVDS) interface at data rates up to 26 Gbps which can be used to provide up to four laser driver signals.

Application Field

Onet4211LDR offers a wide range of applications in 3D sensing, optical communication, and optical data storage. It is designed to operate in high-speed, high-amplitude laser signal environment and thus provides a great deal of flexibility and performance capabilities. The device offers four channels with low voltage differential signalling (LVDS) interface at data rates up to 26 Gbps. It has a current drive capability of up to 1000mA (outputs 1 & 2) and up to 400mA (outputs 3 & 4). This makes it suitable for driving high-power laser diodes as well as edge-emitting lasers. Additionally, it has an adjustable voltage swing (Vset) range of 1 V to 4 V. It also have pre-drive adjustment, pulse-width modulation (PWM) mode, and real-time laser diode current foldback.

Working Principle

The ONET4211LDR is a PMIC that can be used to drive laser devices such as VCSEL and edge-emitting LED lasers in optical power systems. It operates by converting low voltage differential signaling (LVDS) data bits fed to it into four pulses with adjustable amplitudes for each string of the connected laser device(s).

ONET4211LDR consists of four laser driver strings, each driven by a separate full-bridge with adjustable pulse width. An internal oscillator generates the pulse train necessary to modulate the laser output, and the power and modulation control voltage (Vset) is adjustable. The device is designed to operate in high-speed, high-amplitude laser signal environment and thus offers a wide range of performance and flexibility. Additionally, the device employs pre-drive adjustment and data rate alignment, as well as real-time laser diode current foldback.

Figure 1 shows a block diagram of the ONET4211LDR. The input interface of the device receives the LVDS data bits and the power and modulation control inputs. This data is analyzed by the control logic and the laser drivers. Finally, the drivers create the laser pulse at the integrated or external output corresponding to the LVDS data bit.

The device features four outputs which can be operated independently, that is, each output can be programmed to drive a different voltage. The device also has a wide operating range from 1V to 4V, with adjustable voltage swing and adjustable pulse width. This makes it suitable for driving laser diodes in both high and low power applications. The high-speed, low-voltage differential signaling (LVDS) interface of the device makes it suitable for applications such as 3D sensing, optical communication, and optical data storage.

Conclusion

The ONET4211LDR is a PMIC designed for driving laser devices such as VCSEL and edge-emitting LED lasers in optical power systems. It offers four channels with low voltage differential signaling (LVDS) interface at data rates up to 26 Gbps and is capable of driving up to 1000mA (outputs 1 & 2) and up to 400mA (outputs 3 & 4). This makes it suitable for driving both high and low power applications. Additionally, it has pre-drive adjustment, pulse-width modulation (PWM) mode, and real-time laser diode current foldback. This provides great flexibility and performance capabilities for the applications it is intended for such as 3D sensing, optical communication, and optical data storage.

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