Electronic Design

Low-Power Laser Drivers Feature Multiple Channels For DVD, CD, And Other Applications

Designed for rewritable DVD and CD, copiers, laser printers, and fax machines, the T0800 and T0810 laser-diode drivers consume less than 2 mA from a single 5-V supply. The T0800's current-controlled output-current source has five input channels, while the T0810's current-controller current source has three input channels.

The T0800's on-chip RF oscillator (100 to 600 MHz) swings within 100 mA. It drives two different grounded laser diodes for DVD-RAM (650 nm) and CD-RW (780 nm) products. Also, its five channels target five different optical-power levels, which are controlled by a separate IC. The read channel generates a continuous output power level at up to 150 mA per channel.

The T0800 has two selectable outputs for grounded laser diodes, with a total output current of up to 150 mA. Rise and fall times are specified at 1.0 and 1.1 ns, respectively. Users control two different frequencies and swings through four external resistors. A common enable/disable input is included as well. The T0800 works with TTL/CMOS signals, and it's available in a small SS0P24 package.

Similarly, the T0810 features an on-chip RF oscillator (100 to 500 MHz) that swings within 100 mA. Its fast-settling adaptive power-control transimpedance amplifier interfaces between the front-end photodiode and the power-controller circuit. The device itself drives a single laser diode for CD-RW drives. It includes three channels for three different optical-power levels, controlled by a separate IC. Like the T0800, its read channel generates a continuous output power level at up to 150 mA per channel.

The T0810's output current reaches up to 150 mA per channel and 200 mA total. Rise and fall times are specified at 1.0 and 1.1 ns, respectively. Users can control a different frequency and swing through two external resistors. The T0810 also has a common enable/disable input. Like the T0800, this driver works with TTL/CMOS signals. It comes in a small SS0P16 package.

Samples of both devices as well as evaluation boards are available now. Pricing starts at $2.80 each for the T0800 and $2.35 each for the T0810, both in 10,000-unit quantities.

Temic Semiconductor GmbH, P.O. Box 3535, D-74025, Heilbronn, Germany; +49 (0)7131 67 2594; fax +49 (0)7131 67 2423; www.temic-semi.com.

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