AD9668 Analog Devices, Inc., AD9668 Datasheet
AD9668
Manufacturer Part Number
AD9668
Description
4-channel Lvds, Dual-output, Laser Diode Driver With Oscillator
Manufacturer
Analog Devices, Inc.
Datasheet
1.AD9668.pdf
(2 pages)
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FEATURES
Dual current-controlled output current sources
TTL-selectable output
Stable on-chip oscillators with independent frequency
TTL- or LVDS-selectable write channel enables
TTL- or LVDS-selectable oscillator enable
150 mA minimum output current for Read Channel
275 mA minimum output current for Write Channel 1
170 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
MO drives
Laser diode current switching
GENERAL DESCRIPTION
The AD9668 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 either an LVDS or a TTL interface. The
OSCEN pin is also controlled by either an LVDS or a TTL
signal. All channels are summed at the selected LD output pin,
where Write Channel 1 can contribute at least 275 mA output
current, and Write Channel 2 and Write Channel 3 can contribute
at least 170 mA and 150 mA, respectively. The level of the output
current is set by an external resistor that converts an input voltage
into a current at the xSET pins.
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 different values for both
oscillator frequency and amplitude, one for each output. 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. Sp0
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.
with 4 input channels
and amplitude control
supercombo drives
Laser Diode Driver with Oscillator
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
For more information about the AD9668, contact
Analog Devices, Inc. at high_current_drivers.com@analog.com.
OSCEN
OSCEN
W3SET
W2SET
W1SET
4-Channel LVDS, Dual-Output,
W3EN
W3EN
W2EN
W2EN
W1EN
W1EN
RDEN
RSET
VDD
Figure 2. 4-Channel, LVDS, Laser-Driver Pin Configuration
*ACTIVE LOW.
FADJ1 FADJ2 AADJ1 AADJ2
Figure 1. 4-Channel LVDS Laser Driver Block Diagram
W3EN*
W2EN*
W1EN*
W3EN
W2EN
W1EN
FUNCTIONAL BLOCK DIAGRAM
GND
GND
READ CHANNEL
OSCILLATOR
CHANNEL 3
CHANNEL 2
CHANNEL 1
1
2
3
4
5
6
7
8
WRITE
WRITE
WRITE
© 2005 Analog Devices, Inc. All rights reserved.
(Not to Scale)
5mm
AD9668
LFCSP
×
5mm
INS
OUTSEL
OUTPUT A
OUTPUT B
AD9668
www.analog.com
24
23
22
21
20
19
18
17
INS
VDD
LD1
LD1
GND
LD2
LD2
VDD
VDD
LD1
LD2
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AD9668 Summary of contents
Page 1
... MO drives Laser diode current switching GENERAL DESCRIPTION The AD9668 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 either an LVDS or a TTL interface ...
Page 2
... AD9668 © 2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D05444F–0–7/05(Sp0) Rev. Sp0 | Page ...