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FEATURES
Current-controlled current source
with 3 input channels
Output current for Channel 3—315 mA
Output current for other channels—210 mA
Rise time/fall time of 0.8 ns
On-chip oscillator
Single 5 V power supply (±10%)
Low output overshoot
Low power consumption
APPLICATIONS
CD-RW drives
DVD-RW, DVD+RW, MO drives
Laser diode current switching
GENERAL DESCRIPTION
The AD9662 is a laser diode driver for high performance CD
and DVD recordable drives. It includes three channels for three
different optical power levels: the read channel generates a
continuous output power level, whereas Channel 2 and
Channel 3 are used as write channels having 0.8 ns rise/fall
times. All channel currents are summed at the IOUT pin. Each
channel’s output current is established by multiplying the
channel’s gain by the channel’s input current. The input current
for each of the input channels—INR, IN2, and IN3—can be set
either by using an external resistor that converts an input
voltage to a current or by directly using a current source.
An on-chip oscillator is provided to allow output current
modulation (to reduce laser mode hopping). Two external
resistors control the frequency and the amplitude swing of the
oscillator. The push-pull oscillator can swing up to 100 mA p-p
and has a frequency range of 200 MHz to 500 MHz.
3-Channel Laser Diode Driver
with Oscillator
AD9662
FUNCTIONAL BLOCK DIAGRAM
IN3
OUTEN3
CHANNEL 3
IN2
OUTEN2
CHANNEL 2
INR
OUTENR
READ CHANNEL
OUTPUT
IOUT
ENABLE
OSCEN
OSCILLATOR
RF RS
Figure 1. AD9662 3-Channel Laser Diode Driver
Rev. C
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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.

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AD9662
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
ESD Caution.................................................................................. 5
REVISION HISTORY
11/05—Rev. SpB to Rev. C
Changes to Format .............................................................Universal
7/04—Rev. Sp0 to Rev. SpB
Changes to Note 2 in Specifications............................................... 4
Changes to Absolute Maximum Ratings ....................................... 5
Changes to Figure 17...................................................................... 12
12/03—Rev. SpA: Initial 2-Page Web Version
12/03—Rev. Sp0: Initial Full Version
Pin Configuration and Function Descriptions..............................6
Typical Performance Characteristics ..............................................7
Applications..................................................................................... 10
Temperature Considerations .................................................... 10
Evaluation Board ............................................................................ 12
Outline Dimensions ....................................................................... 13
Ordering Guide .......................................................................... 13
Rev. C | Page 2 of 16

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AD9662
SPECIFICATIONS
At TAMB, VCC = 5 V, ENABLE = 1, OSCEN = 0, OUTENx = 1, unless otherwise stated.
Table 1.
Parameter
LASER AMPLIFIER
Output Current Read Channel
Output Current Channel 2
Output Current Channel 3
Total Output Current
Output Current Linearity1
Output Current Linearity1
Output Current Linearity1
Best-Fit Current Gain1
Best-Fit Current Gain1
Best-Fit Current Gain1
Best-Fit Current Offset1
Best-Fit Current Offset1
Best-Fit Current Offset1
IOUT Series Resistance
Input Impedance (RIN), Channel R, Channel 2
Input Impedance (RIN), Channel 3
IOUT Supply Sensitivity (PSRR)
Read Mode
IOUT Supply Sensitivity (PSRR)
Write Mode
Output Current Noise
IOUT Temperature Sensitivity
Read Mode
IOUT Temperature Sensitivity
Write Mode Channel 2
IOUT Temperature Sensitivity
Write Mode Channel 3
LASER AMPLIFIER AC SPECIFICATIONS
Write Rise Time2
Write Fall Time2
Output Current Overshoot
IOUT ON Propagation Delay
IOUT OFF Propagation Delay
Disable Time
Enable Time
OSCILLATOR SPECIFICATIONS
Oscillator Frequency
Oscillator Frequency Temperature Coefficient
Disable Time Oscillator
Enable Time Oscillator
Conditions
Output is sourcing, OUTENR = 0
Output is sourcing, OUTEN2 = 0
Output is sourcing, OUTEN3 = 0
Output is sourcing, OUTEN3 = 0 and
(OUTENR = 0 and/or OUTEN2 = 0)
Read Channel, OUTENR = 0
Write2 Channel, OUTEN2 = 0
Write3 Channel, OUTEN3 = 0
Read Channel, OUTENR = 0
Write2 Channel, OUTEN2 = 0
Write3 Channel, OUTEN3 = 0
Read Channel, OUTENR = 0
Write2 Channel, OUTEN2 = 0
Write3 Channel, OUTEN3 = 0
Total ROUT to VCC rail
RIN to GND
RIN to GND
IOUT = 50 mA (read-only), VCC = 5 V ± 10%
OUTENR = 0
IOUT = 100 mA (50 mA read, 50 mA write)
VCC = 5 V ± 10%, OUTENR = 0 and
(OUTEN2 = 0 or OUTEN3 = 0)
IOUT = 50 mA (Read), OUTENR = 0, f = 300 MHz
IOUT = 50 mA (read-only)
OUTENR = 0
IOUT = 100 mA (50 mA Read, 50 mA Write2)
OUTENR = 0, OUTEN2 = 0
IOUT = 100 mA (50 mA Read, 50 mA Write3)
OUTENR = 0, OUTEN3 = 0
IOUT = 50 mA dc (Read), 50 mA pulse W2 or W3
OUTENR = 0 and ( OUTEN2 = 0 or OUTEN3 = 0)
IOUT = 50 mA dc (Read), 50 mA pulse W2 or W3
OUTENR = 0
IOUT = 50 mA dc (Read), 50 mA pulse W2 or W3
OUTENR = 0 and ( OUTEN2 = 0 or OUTEN3 = 0)
OUTENx 50% H-L to IOUT at 50% of final value
OUTENx 50% L-H to IOUT at 50% of initial value
ENABLE 50% H-L to IOUT at 50% of initial value
ENABLE 50% L-H to IOUT at 50% of final value
OUTENR = 0
RF = 9.53 kΩ, RS = 23.7 kΩ
RF = 9.53 kΩ, RS = 23.7 kΩ
OSCEN 50% H-L to amplitude at 50% of initial value
OSCEN 50% L-H to amplitude at 50% of final value
Min Typ Max Unit
210 235
210 235
315 340
>550
mA
mA
mA
mA
−4 ±0.6 +4 %
−4 ±0.6 +4 %
−4 ±0.1 +4 %
125 135 145 mA/mA
120 130 140 mA/mA
240 260 280 mA/mA
−7 ±0.6 +7 mA
−7 ±0.6 +7 mA
−30 −2 +15 mA
6.5 10 Ω
160 200 240 Ω
80 100 120 Ω
10 15 %/V
10 15 %/V
150 pA/√Hz
100 ppm/°C
100 ppm/°C
100 ppm/°C
0.8 1.8 ns
0.6 1.8 ns
13 %
2.7 ns
2.7 ns
5.4 ns
13.5 ns
265 300
600
4
6
325 MHz
ppm/°C
ns
ns
Rev. C | Page 3 of 16

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AD9662
Parameter
LOGIC SPECIFICATIONS
Logic HI Threshold
Logic LO Threshold
Input Impedance
Input Leakage Current
SUPPLY CURRENT
Power-Down
Power-Up
Inputs Disabled
Inputs Disabled, OSC Enabled
Read Mode, OSC Enabled3
IOUT = 50 mA
Write Mode3
IOUT = 100 mA (50 mA W2, 50 mA W3)
OPERATING CONDITIONS
Supply Voltage Range
Operating Temperature Range
Conditions
Min Typ Max Unit
2.0 V
0.8 V
OUTENx, ENABLE, OSCEN
>10 MΩ
OUTENx, ENABLE, OSCEN
<1 μA
ENABLE OSCEN OUTENR OUTEN2 OUTEN3
0 01 1 1
8.5 10 mA
1 01 1 1
1 11 1 1
1 10 1 1
18 22 mA
52 62 mA
55 65 mA
1 01 0 0
29 35 mA
4.5 5.5 V
0 85 °C
1 Output linearity, offset current, and gain are calculated using a best-fit method at 30 mA, 45 mA, 60 mA, 75 mA, and 90 mA for the Read and Write2 Channels and
90 mA, 105 mA, 120 mA, 135 mA, and 150 mA for Write Channel 3. Each channel’s output current is given by IOUT = (IIN × Gain) + IOS.
2 This parameter is guaranteed by design and characterization using six sigma. Rise and fall times are measured electrically from the 10% to 90% points using a Sharp
GH0781JA2C diode as a load.
3 The values specified do not include the output current.
Rev. C | Page 4 of 16

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ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Supply Voltage +VS
Pin 9, Pin 15, and Pin 16
Input Pins
Pin 1 and Pin 2
Pin 5
Pin 6, Pin 7, Pin 8, Pin 10, and Pin 11
Internal Power Dissipation1
16-Lead QSOP
Operating Temperature Range
Storage Temperature Range
Lead Temperature, Soldering 60 sec
Range
5.5 V
2.2 mA
1.6 mA
−0.8 V to +5.5 V
620 mW
0°C to +85°C
−65°C to +150°C
300°C
1 Power dissipation is specified on SEMI standard 4-layer board.
AD9662
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the
human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Rev. C | Page 5 of 16