AD9662 Analog Devices, AD9662 Datasheet

AD9662

Manufacturer Part Number

AD9662

Description

3-Channel Laser Diode Driver with Oscillator

Manufacturer

Analog Devices

Datasheet

1.AD9662.pdf (2 pages)

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FEATURES

Current controlled current source

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 I

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.

For more information about the AD9662, contact Analog Devices,

Inc. via email at:

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.

with 3 input channels

high_current_drivers.com@analog.com.

OUT

pin. Each

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.326.8703

OUTEN3

OUTEN2

OUTENR

OSCEN

INR

IN3

IN2

3-Channel Laser Diode Driver

Figure 1. AD9662 3-Channel Laser Diode Driver

FUNCTIONAL BLOCK DIAGRAM

READ CHANNEL

OSCILLATOR

CHANNEL 3

CHANNEL 2

OUTENR

OUTEN2

OUTEN3

GND

INR

IN2

IN3

Figure 2. QSOP-16 Pinout

AD9662

www.DataSheet4U.com

with Oscillator

GND

ENABLE

OSCEN

OUT

OUTPUT

ENABLE

www.analog.com

AD9662

OUT

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