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Lowest noise laser diode driver

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article image The LMH6533 laser diode driver.

NATIONAL Semiconductor, represented by Arrow Electronics , has launched its newest laser diode driver (LDD) for use in optical pickup units (OPUs).

The LMH6533 has extremely fast switching rates and very low output current noise with low power consumption.

The reduced power consumption provides better heat dissipation in the system, while the low noise allows the fastest read times for optical disk drives.

The LMH6533 is designed for combination DVD/CD recorder optical storage devices used in desktop, notebook and consumer DVD video recorders.

National Semiconductor's latest laser diode driver allows OPU manufacturers to provide consumers with the highest-performance DVD/CD recorders on the market.

By integrating the LVDS interface into the driver, National addresses the high speed requirements of driving the signal from the controller chip to the OPU.

The LVDS interface also reduces overall system costs for optical storage device manufacturers by keeping the write strategy digital circuitry on the controller chipset rather than integrating it into the laser diode driver.

National's VIP10C process technology provides a very fast switching rate of 0.5ns and noise levels of 0.5nA per square root Hertz, enabling the fastest read, write and rewrite times for optical recording.

National's LMH6533 laser diode driver contains two high-current outputs for reading and writing DVD (650nm) or CD (780nm) lasers. It achieves read, write and erase functions through four separate switched current channels.

The LVDS interface delivers DVD write speeds of 16x and higher while minimising noise and cross-talk. The device provides one 300mA and two 150mA write channels, plus a 150mA read channel.

Additionally, it minimizes electromagnetic interference (EMI), allowing disk drive manufacturers to develop devices without the extra cost of shielding.

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