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 gener-
ates 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 contrib-
ute a minimum 325 mA maximum output current, and
Write Channel 2 and Write Channel 3 can contribute a mini-
mum of 250 mA and 150 mA, respectively. The level of the out-
put 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 × 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
© 2004 Analog Devices, Inc. All rights reserved.
04597-Sp0-002
04597-Sp0-001
OSCEN
OSCILLATOR
ENABLE
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