4-Channel, LVDS, Dual-Output,
Laser Diode Driver with Oscillator
AD9665
FUNCTIONAL BLOCK DIAGRAM
FEATURES
W3SET
W3DIS
W3DISN
Dual, current-controlled output current sources with 4 input
channels
WRITE
CHANNEL 3
TTL-selectable output
W2SET
W2DIS
W2DISN
Stable on-chip oscillators with independent frequency and
amplitude control
WRITE
OUTPUT A
OUTPUT B
ENABLE
LD1
LD2
CHANNEL 2
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
W1SET
W1DIS
W1DISN
WRITE
CHANNEL 1
RSET
RDIS
READ CHANNEL
OSCILLATOR
Typical rise time/fall time of 0.8 ns
Low power consumption
OSCEN
Single 5 V power supply ( 10%)
INS OUTSEL
F
F
A
A
ADJ2
ADJ1
ADJ2
ADJ1
Figure 1. 4-Channel, LVDS, Laser Driver Block Diagram
APPLICATIONS
DVD-R, DVD+R, DVD-RW, DVD+RW, DVD-RAM
supercombo drives
Magneto-optical (MO) drives
Laser diode current switching
1
2
3
4
5
6
7
8
24
23
W3DISN
W3DIS*
GND
INS
V
DD
22
21
GENERAL DESCRIPTION
LD1
LD1
GND
LD2
LD2
AD9665
GND
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
LFCSP
20
19
18
17
W2DISN
W2DIS*
W1DISN
W1DIS*
5mm
(Not to Scale)
× 5mm
V
DD
RDIS
pins are active low logic. The OSCEN pin is controlled by
*TTL ACTIVE LOW
NOTES
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. The level of the output current is set by an
external resistor, which converts this voltage into a current
at the WxSET pin.
1. THE EXPOSED PAD SHOULD BE CONNECTED TO GROUND.
Figure 2. 4-Channel, LVDS, Laser Driver Pin Configuration
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. E
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 registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
© 2010 Analog Devices, Inc. All rights reserved.
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