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.

© 2001 Elantec Semiconductor, Inc.

General Description

The EL6241C is a combination read + 2 write level laser driver and IV

amplifier, with an extra read + oscillator ROM channel for use in dual-

laser ‘combo’ drivers. A separate (amplitude and frequency) oscillator

modulates the selected output for laser noise reduction during read or

write. All these functions are provided in a 24-lead QSOP package.

The CD pin, when high, selects the CD (write) laser. Positive current

supplied to the IIN lines, through a user selected resistor, allow the full

scale range of each amplifier to be matched to the full scale range of

the users control DACs. When the write laser is selected, and the

WEN pins are switched low, the respective current is summed to the

output with 1ns rise and fall times.

OUTEN pins are high. The CD line allows the oscillator to operate at

different amplitudes and frequencies for each laser.

The entire chip is powered down when ENABLE is low. The user can

define the gain of the I/V amplifier. With a slew rate of 200V/µs, the

I/V amplifier can normally settle to 1% within 30ns.

Connection Diagrams

1

2

3

4

16

15

14

13

5

6

7

12

11

9

8

10

20

19

18

17

24

23

22

21

VOUT

VREF

IINR

IIN2

RF1

IIN3

GND

RF2

WEN2

CD

WEN3

NC

PDIN

VDD

VDD

IOUT1

GND

GND

RAMP1

RAMP2

ENABLE

OSCEN

IOUT2

VDD

19

18

17

16

15

14

13

1

2

3

4

5

6

7

Thermal Pad

IIN2

RF1

IIN3

GND

RF2

WEN2

CD

VCC

IOUT1

GND

GND

RAMP1

RAMP2

ENABLE

Features

• Read + 2 write channel laser driver

with oscillator and fast I/V

amplifier plus a separate ROM

laser driver with oscillator

• 200V/µs I/V amplifier

• 100X gain, 100mA low noise read

channel

• 250X gain, 250mA and 150X gain,

150mA write channels

• Write rise/fall times = 0.8ns

• Single +5V supply

• Auto-oscillator on-off with

OUTEN signals

Applications

• Combo CD-RW + DVD-ROM

• CD-RW to 16X

• CD-R to 32X

• Writable optical disk drives

Ordering Information

Part No

Temp Range

Package

Outline #

EL6241CU

-40°C to+ 85°C

24-Pin QSOP

MDP0040

EL6241CL

-40°C to+ 85°C

24-Pin LPP

MDP0046

EL6241C - Product Brief

Dual Laser Driver with APC Amp