EL6257CU Elantec Inc, EL6257CU Datasheet

EL6257CU

Manufacturer Part Number

EL6257CU

Description

4-channel laser diode driver and oscillator

Manufacturer

Elantec Inc

Datasheet

1.EL6257CU.pdf (2 pages)

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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.

Features

Applications

Ordering Information

• High-performance laser diode

• Voltage-controlled output current

• Current-controlled output current

• Rise time = 1.0 ns

• Fall time = 1.1 ns

• On chip oscillator with frequency

• Oscillator to 500 MHz

• Oscillator to 100 mA pk/pk

• Single +5V supply (±10%)

• Current amplification = 100

• Disable feature for power-up

• TTL/CMOS control signals

• DVD drives

• CD-RW applications

• Writable optical drives

• Laser diode current switching

EL6257CU

Part No

driver

source to 150 mA per channel,

requiring one external set resistor

per channel

source to 150 mA per channel

and amplitude control by use of

external resistors to ground

protection and power savings

Temp. Range

0°C to +70°C

QSOP-24

Package

MDP0040

Outline #

EL6257C - Product Brief

4-Channel Laser Diode Driver + Oscillator

General Description

The EL6257C is a high-performance four channel laser diode current

amplifier that provides controlled current to a grounded laser diode.

The four amplifiers can provide up to 150 mA per channel of DC or

pulsed current. Channels 2, 3, and 4 must be used as the write chan-

nels, with switching speeds of approximately one nanosecond rise/fall

time. All four channels are summed together at the I

ing the user to create multilevel waveforms in order to optimize laser

diode performance. The level of the output current is set by an analog

voltage applied to an external resistor which converts the voltage into

a current at the I

is then amplified by 100X to become a current source at pin I

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

tion when in the read mode. This is turned on when the OSCEN pin is

held high (floating not recommended). Complete control of amplitude

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). The oscillator will also turn off whenever any of the

OUTEN pins for channels 2, 3, and 4 (the write channels) are low (see

truth table).

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

float high when open. Complete I

holding the ENABLE pin low, which will override the OUTEN con-

trol pins.

The external resistors allow the user to accurately and independently

set each amplifier transconductance by applying a voltage to each

resistor, without restriction on the voltage range, thus ensuring broad

voltage DAC compatibility. Alternatively, the I

from a current DAC or other current source.

Connection Diagram

pin (virtually ground). The current seen at this pin

OUTEN2

OUTEN3

OUTEN4

RFREQ

OUTEN

GND

INR

IN2

IN3

IN4

OUT

GND

RAMP

ENABLE

OSCEN

GND

shut-off is also achieved by

OUT

pin can be biased

output, allow-

OUT

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EL6257CU Summary of contents

Page 1

... Part No Temp. Range Package Outline # EL6257CU 0°C to +70°C QSOP-24 MDP0040 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. © ...

Page 2

EL6257C - Product Brief 4-Channel Laser Diode Driver + Oscillator 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 cir- cuitry or ...

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