ANALOG DEVICES AD9665 handbook
Contents
1. GND 4 H LFCSP H 21 LD1 W2DISN 5 i mm x 5mm H 20 GND irae y Not to Scale H 49 pe W1DISN 7 H H 18 LD2 W1DIS 8 17 Vpop NS o Ea W l a lt x z wW TTL ACTIVE LOW SEE TABLE 3 05269 050 Figure 2 4 Channel LVDS Laser Driver Pin Configuration For more information on the AD9665 email Analog Devices Inc at high_current_drivers com analog com One Technology Way P O Box 9106 Norwood MA 02062 9106 U S A Tel 781 329 4700 www analog com Fax 781 461 3113 2005 Analog Devices Inc All rights reserved AD9665 2005 Analog Devices Inc All rights reserved Trademarks and ANALOG registered trademarks are the property of their respective owners D05269F 0 12 05 SpD DEVICES www analog com Rev SpD Page 2 of 22. ANALOG DEVICES 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 negative logic Independent TTL oscillator enables positive logic 170 mA minimum output current for the read channel 510 mA minimum output current for Write Channel 1 330 mA minimum output current for Write Channel 2 165 mA minimum output current for Write Channel 3 950 mA typical total output current Typical rise time fall time of 0 8 ns Low power consumption Single 5 V power supply 10 APPLICATIONS DVD R DVD R DVD RW DVD RW DVD RAM supercombo drives Magneto optical MO drives Laser diode current switching GENERAL DESCRIPTION The AD9665 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 WxDIS and RDIS pins are active low logic The OSCEN pin is controlled by an active high TTL signal All active channels are summed at the output where Write Channel 1 can contribute at least 325 mA output current and Write Channel 2 and Write Channel 3 can contribute at least 250 mA and 150 mA respectively Th
3. e level of the output current is set by an external resistor which converts this voltage into a current at the WxSET 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 Rev SpD 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 4 Channel LVDS Dual Output Laser Diode Driver with Oscillator AD9665 FUNCTIONAL BLOCK DIAGRAM Ws WRITE _W3DIS CHANNEL 3 W3DISN W2SET W2DIS W2DISN OUTPUT A LD1 WRITE CHANNEL 2 WRITE CHANNEL 1 READ CHANNEL a OSCILLATOR INS OUTSEL W1SET W1DIS W1DISN OUTPUT B LD2 OSCEN ENABLE 05269 001 Fapu1 Faps2 Aaps1 Aapu2 Figure 1 4 Channel LVDS Laser Driver Block Diagram 29 OUTSEL WSDISN 1 H 24 INS W3DIS 2 H 23 Vpp GND 3 f AD9665 H 22 LD1
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