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Laser diode drivers provide 700mA output current

Posted: 29 Mar 2005 ?? ?Print Version ?Bookmark and Share

Keywords:atmel? laser diode driver? atr0839? atr0849?

The two new laser diode drivers from Atmel Corp. support DVDRW/CD-RW combo drives with up to 16x writing speed for DVDRW and 52x for CD-RW.

Providing a maximum output current of more than 700mA, the ATR0839 and ATR0849 extend the company's existing family of laser diode drivers with Low Voltage Differential Signals (LVDS) for enhanced write speed.

Since these new products are provided in small packages, they are designed for use in small SLIM drives in notebooks, as well for half-height drives used in desktop PCs and consumer DVD recorders.

Both the ATR0839 and ATR0849 provide four-channels, one read channel and three write, with the write channels controlled by LVDS signals. Since the LVDS termination is on-chip, system designers can save three resistors in their BoMs, which helps reduce space and cost, added Atmel. The two outputs can be used either for DVD laser diodes with a wavelength of 650nm or for CD laser diodes with a wavelength of 780nm.

Additionally, an integrated oscillator reduces laser mode hopping during read mode. With four resistors, the oscillator's frequency and swing can be set for each output separately. The ATR0839 enables the oscillator by LVDS signals, while the ATR0849 performs this function by CMOS-compatible single-ended signals.

Samples of the new laser diode drivers are available in Pb-free and green QFN24 packages with a measurement of 4-by-4-by-0.9mm. Both devices will also be soon available in pin-compatible QFN packages with the exposed pad on top. Pricing starts at $2.60 each in quantities of 10,000.

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