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Atmel laser diode driver includes LVDS

Posted: 22 Dec 2004 ?? ?Print Version ?Bookmark and Share

Keywords:atmel? laser diode driver? low voltage differential signals? lvds? atr084x?

Atmel Corp.'s new laser diode driver family with low voltage differential signals (LVDS) for enhanced write speed is designed for DVD1RW / CD-RW combo drives and enables read/write speeds of up to 16 times (DVD+RW) and 52 times (CD-RW).

The new ATR084x family includes five products with different features so that engineers can create their dedicated pick up design. All members of this family are four-channel devices with two selectable outputs. Both outputs can be used either for DVD laser diodes with a wavelength of 650nm or for CD-RW laser diodes with a wavelength of 780nm. The LVDS inputs for the three write channels allow fast and reliable output current control, added Atmel. The two identical outputs support currents of up to 500mA, and rise and fall time is less than 0.8ns. An on-chip RF oscillator reduces laser mode hopping noise during read mode.

The ATR0840 can be used either in legacy singled-ended enable mode or in LVDS enable mode without changing the board design. Both enable inputs can be used for single-ended mode without any additional components. The ATR0841 is pin- and functionally compatible with the ATR0840, but includes an internal, integrated LVDS termination resistor that is necessary for LVDS operation. Designs using competing devices that do not have this resistor integrated need to apply it externally.

According to the company, the most innovative new ATR084x family member is the ATR0842, which enables the design of next-generation blue laser drives. The ATR0842 can be powered with up to 8V, allowing the use of high-voltage laser diodes with up to 6V, as necessary for blue lasers.

The ATR0843 is functionally compatible with the ATR0840 and has, in addition, a separate enable function for the read channel. Meanwhile, the ATR0844 is a pin-compatible version with integrated LVDS termination resistor.

All ATR084x devices are available in Pb-free QFN24 packages, with dimensions of 4-by-4-by-0.9mm. All products will also be available soon in pin-compatible QFN packages with the exposed pad on top. Samples of new laser diode drivers in QFN24 packages are already available. Pricing starts at $3.60 each.

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