4-Channel LVDS Dual-Output
Laser Diode Driver with Oscillator
AD9664
Rev. SpA
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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
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Tel: 781.329.4700
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Fax: 781.326.8703
© 2004 Analog Devices, Inc. All rights reserved.
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%)
APPLICATIONS
DVD-R, DVD+R, DVD-RW, DVD+RW, DVD-RAM
supercombo drives
MO drives
Laser diode current switching
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.
FUNCTIONAL BLOCK DIAGRAM
WRITE
CHANNEL 3
WRITE
CHANNEL 2
WRITE
CHANNEL 1
READ CHANNEL
OSCILLATOR
OUTPUT A
OSCEN
RDIS
W1DISN
W1DIS
W1SET
W2DISN
W2DIS
W2SET
W3DISN
W3DIS
W3SET
RSET
04597-S
p0-001
OUTPUT B
LD1
LD2
FADJ1 FADJ2 AADJ1 AADJ2
INS
OUTSEL
ENABLE
Figure 1. 4-Channel LVDS Laser Driver Block Diagram
24
INS
23
LVDD
22
LD1
21
LD1
W3DISN
1
W3DIS
2
GND
3
32
HV
DD
20
GND
19
LD2
18
LD2
17
LVDD
RDIS
9
AV
DD
10
AV
DD
11
W3
S
E
T
12
W2
S
E
T
13
W1
S
E
T
14
RS
E
T
15
E
N
ABLE
16
GND
4
W2DISN
5
W2DIS
6
W1DISN
7
W1DIS
8
31
N/C
30
OSCEN
29
OUTSE
L
28
FADJ
1
27
FADJ
2
26
AADJ
1
25
AADJ
2
AD9664
LFCSP
5mm × 5mm
(Not to Scale)
04597-S
p0-002
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.
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