ELANT EL6281CU, EL6281CL Datasheet

EL6281C - Product Brief

4-Channel Laser Driver with APC Amp

EL6281C - Product Brief

Features

• Read + 3 Write Channel laser driver with oscillator & fast I/V amplifier

• Rise time = 0.8 nsec

• Fall time = 0.8 nsec

• 200V/µs I/V amplifier

• 100X gain, 100mA low noise read channel

• 200X gain, 200mA write channel

• Two 100X gain, 100mA write channels

• 500MHz, 100mA

Oscillator

P-P

with dual frequency and amplitude control

• 3.3V compatible logic signals

• Single +5V supply

Applications

• CD-RW to 16X

• CD-R to 32X

• Writable Optical Disk Drives

Ordering Information

Part No. Temp. Range Package Outline #

EL6281CU 0°C to +70°C QSOP-24 MDP0040

EL6281CL 0°C to +70°C LPP-24 MDP0046

General Description

The EL6281C is a combination read + 3 write level laser driver with IV amplifier. A dual amplitude, dual frequency RF oscillator sums on the output for laser noise reduction during read or write. All these functions are provided in 24-lead QSOP and LPP packages.

The ENABLE pin enables the read & write channels. Positive current supplied to the IIN lines, through user selected resistors, allow the full scale range of each amplifier to be matched to the full scale range of the users control DACs. When the WEN pins are switched low, the respective current is summed to the output with 1ns rise and fall times.

The 100mA

(max) oscillator is switched on and off by the OSCEN

P-P

line. The R/W line allows the oscillator to operate at one amplitude and frequency when R/W is high, and another amplitude and frequency when R/W is low.

The entire chip is powered down when ENABLE is low. The user can calibrate the gain of the I/V amplifier. With a slew rate around 200V/µs, the I/V amplifier can normally settle to less than 1% within 30ns.

Connection Diagram

VOUT

VREF

IINR

IIN2

RFREQ1

IIN3

IIN4

RFREQ2

RWB

GND

WEN4

WEN3

PDIN

VCC

IOUT

GND

RAMP1

RAMP2

ENABLE

OSCEN

VCC

WEN2

IINR

VREF

VOUT

PDIN

IIN2

RF1

IIN3

IIN4

RF2

RWB

GND

WEN4

Thermal Pad

WEN3

WEN2

24-Pin LPP Top View

VCC

IOUT

GND

RAMP1

RAMP2

ENABLE

VCC

OSCEN

October 25, 2001

Note: All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication; however, this data sheet cannot be a “controlled document”. Current revisions, if any, to these

specifications are maintained at the factory and are available upon your request. We recommend checking the revision level before finalization of your design documentation.

EL6281C - Product Brief

4-Channel Laser Driver with APC Amp

EL6281C - Product Brief

General Disclaimer

Specifications contained in this data sheet are in effect as of the publication date shown. Elantec, Inc. reserves the right to make changes in the circuitry or specifications contained herein at any time without notice. Elantec, Inc. assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement.

WARNING - Life Support Policy

Elantec, Inc. products are not authorized for and should not be used within Life Support Systems without the specific written consent of Elantec, Inc. Life Support systems are equipment intended to sup-

Elantec Semiconductor, Inc.

675 Trade Zone Blvd. Milpitas, CA 95035 Telephone: (408) 945-1323

(888) ELANTEC Fax: (408) 945-9305 European Office: +44-118-977-6020 Japan Technical Center: +81-45-682-5820

port or sustain life and whose failure to perform when properly used in accordance with instructions provided can be reasonably expected to result in significant personal injury or death. Users contemplating application of Elantec, Inc. Products in Life Support Systems are requested to contact Elantec, Inc. factory headquarters to establish suitable terms & conditions for these applications. Elantec, Inc.’s warranty is limited to replacement of defective components and does not cover injury to persons or property or other consequential damages.

October 25, 2001

Printed in U.S.A.