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| 4-Channel LVDS Dual-Output Laser Diode Driver with Oscillator AD9664 FEATURES Dual-current controlled output current sources with 4 input channels TTL selectable output Stable on-chip oscillators with independent frequency and amplitude control TTL or LVDS selectable write channel enables Independent TTL oscillator enable 150 mA minimum output current for Read Channel 325 mA minimum output current for Write Channel 1 250 mA minimum output current for Write Channel 2 150 mA minimum output current for Write Channel 3 Rise time/fall time of 0.8 ns Low output overshoot Low power consumption Single 5 V power supply (10%) W3SET W3DIS W3DISN FUNCTIONAL BLOCK DIAGRAM WRITE CHANNEL 3 W2SET W2DIS W2DISN WRITE CHANNEL 2 OUTPUT A LD1 W1SET W1DIS W1DISN WRITE CHANNEL 1 OUTPUT B LD2 RSET RDIS READ CHANNEL INS FADJ1 FADJ2 AADJ1 AADJ2 OUTSEL APPLICATIONS DVD-R, DVD+R, DVD-RW, DVD+RW, DVD-RAM supercombo drives MO drives Laser diode current switching Figure 1. 4-Channel LVDS Laser Driver Block Diagram GENERAL DESCRIPTION The AD9664 is a laser diode driver for high performance CD-RW and DVD recordable drives. It includes four channels for four different optical power levels: the Read Channel generates a continuous output power level, whereas Channel 1, Channel 2, and Channel 3 can be used as write channels that can be controlled with an LVDS or TTL interface. The OSCEN pin is controlled by a TTL signal. All channels are summed at the selected LD output pin where Write Channel 1 can contribute a minimum 325 mA maximum output current, and Write Channel 2 and Write Channel 3 can contribute a minimum of 250 mA and 150 mA, respectively. The level of the output current is set by an external resistor, which converts this voltage into a current at the xSET pin. An on-chip oscillator is provided to allow output current modulation and to reduce laser mode hopping. Four external resistors permit the setting of two distinct values for the frequency and swing of the oscillator. The oscillator can output up to 100 mA p-p of current (push-pull oscillator) with a frequency range of 200 MHz to 500 MHz. W3DISN 1 W3DIS 2 GND 3 GND 4 W2DISN 5 W2DIS 6 W1DISN 7 W1DIS 8 32 31 30 29 28 27 26 25 HVDD N/C OSCEN OUTSEL FADJ1 FADJ2 AADJ1 AADJ2 LFCSP 5mm x 5mm (Not to Scale) AD9664 24 23 22 21 20 19 18 17 INS LVDD LD1 LD1 GND LD2 LD2 LVDD RDIS 9 AVDD 10 AVDD 11 W3SET 12 W2SET 13 W1SET 14 RSET 15 ENABLE 16 Figure 2. 4-Channel LVDS Laser Driver Pin Configuration For more information about the AD9664, contact Analog Devices at high_current_drivers.com@analog.com. Rev. SpA Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.326.8703 (c) 2004 Analog Devices, Inc. All rights reserved. 04597-Sp0-002 04597-Sp0-001 OSCEN OSCILLATOR ENABLE AD9664 (c) 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D04597-0-4/04(SpA) Rev. SpA | Page 2 of 2 |
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