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Zarlink laser driver writes 4.7GB in <6 mins

Posted: 10 Feb 2004 ?? ?Print Version ?Bookmark and Share

Keywords:zarlink semiconductor? laser diode driver? zl40510? zl40511?

Zarlink Semiconductor Inc. has disclosed that its ZL40510 and ZL40511 devices are the first commercially available laser diode drivers that support x16 DVD and x52 CD write/rewrite speeds.

Powered by the laser diode drivers, DVD/CD recorder units will be able to write a 4.7GB DVD disc in under six minutes. The products include two four-channel devices capable of driving separate 650nm DVD and 780nm CD lasers in a combination DVD/CD unit. The ZL40510 supports up to x16 capabilities for high-speed DVD recorder systems and optical disc drives, while the ZL40511 is suitable for existing slower speed x4 and x8 systems.

Both devices include three 500mA write channels with 240x current gain, and one 150mA low-noise read channel with 100x current gain. They feature fast high-current switching times, with guaranteed rise times of 1.2ns and fall times of 1.4ns, and typical performance of 0.9ns rise time and 1.1ns fall time over the full current range.

Providing stable performance at a maximum junction temperature of 150C, the high heat tolerance of the products simplifies the design of the optical pickup unit and helps ensure reliable operation. The laser diode drivers also include a high performance, low harmonic, switched oscillator with a programmable frequency range of 200MHz to 500MHz, and 20mA to 100mA peak-to-peak.

The ZL40510's read and write channels are controlled by an integrated LVDS interface, which provides low-noise, high-speed data transmission over ribbon cables between the controller chip and the optical pickup unit. The LVDS interface also allows the write strategy to be inexpensively and efficiently incorporated into the motherboard chips, reducing the overall cost of the optical pickup unit.

The ZL40511 driver includes the same performance features as the ZL40510, but with a CMOS logic-compatible control interface to cost-effectively support existing slower speed x4 and x8 DVD/CD recorder units.

Offered in a 4-by-4mm 24-pin QFN packaging, the units are priced at 65 cents in quantities of 100,000. Evaluation boards are also available.

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