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.

Features

• “Shrink-Small” Outline Package

• Voltage-controlled output current

source, requiring one external set

resistor per channel

• Auto oscillator on-off with

OUTEN signals

• Rise time = 0.8ns

• Fall time = 0.8ns

• On chip oscillator with frequency

and amplitude control by use of

external resistors to ground

• Oscillator to 500MHz

• Oscillator to 100mA pk/pk

• Single +5V supply (±10%)

• Disable feature for power-up

protection and power savings

• Fast Settling APC Amplifier

Applications

• CD-RW applications

• Writable optical drives

• Laser diode current switching

Ordering Information

Part No.

Temp. Range

Package

Outline #

EL6244CU

0°C to +70°C

16-Pin QSOP

MDP0041

General Description

The EL6244C is a high-performance three channel laser driver that

provides controlled current to a grounded laser diode. Channels 2 and

3 should be used as the write channels, with switching speeds of

approximately one nanosecond rise/fall time. All three channels are

level waveforms in order to optimize laser diode performance. The

level of the output current is set by an analog voltage applied to an

(virtually ground). The current seen at this pin is then amplified to

An on-chip 500MHz oscillator is provided to allow output current

modulation when in any mode. This is turned on only when the

OSCEN and OUTEN pins are held high. Complete control of ampli-

tude and frequency is set by two external resistors connected to ground

at pins RFREQ and RAMP (see graphs in this data sheet for further

explanation).

Output current pulses are enabled when an ‘L’ signal is applied to the

OUTEN pin. No output current flows when OUTEN is ‘H’, and addi-

tional laser diode protection is provided since the OUTEN input will

holding the ENABLE pin low, which will override all other control

pins.

The EL6244C also includes a fast settling APC amplifier designed to

interface directly with the front end monitor diode and the sample-

and-hold amplifier for read and write power control. Its 100MHz

bandwidth and 30ns settling time enable up to 16X CD-RW design.

Connection Diagram

1

2

3

4

16

15

14

13

5

6

7

12

11

10

8

9

VREF

VCC

IINR

IOUT

IIN2

GND

IIN3

ENABLE

RFREQ

RAMP

OUTEN3

OSCEN

OUTEN2

VCC

VOUT

PDIN

EL6244C - Product Brief

3-Channel Laser Diode Driver w/Oscillator & APC Amplifier