EL6253CU Elantec Inc, EL6253CU Datasheet

EL6253CU

Manufacturer Part Number

EL6253CU

Description

Manufacturer

Elantec Inc

Datasheets

1.EL6253CU.pdf (2 pages)

2.EL6253CU.pdf (2 pages)

3.EL6253CU.pdf (2 pages)

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Features

Applications

Ordering Information

North America: 1-888-352-6832 X 311

Asia: +85-45-682-5820

Europe: +44-18-977-6020

• Ultra-Small Package Outline

• 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

•

• CD-RW applications

• MO drives

• Writable optical drives

• Laser diode current switching

EL6253CU

Complete Product Specifications

Part No

source to 120 mA per channel,

requiring one external set resistor

per channel

source to 120 mA per channel

and amplitude control by use of

external resistors to ground

protection and power savings

Elantec Technical Support:

Temp. Range

0°C to +70°C

QSOP-16

Package

MDP0041

Outline #

EL6253C - Product Brief

3-Channel laser diode Driver + Oscillator

General Description

The EL6253C is a high-performance three channel laser diode current

amplifier that provides controlled current to a grounded laser diode.

Amplifiers R and 2 can provide up to 120 mA per channel of DC or

pulsed current whereas amplifier 3 can provide up to 240 mA. Chan-

nels 2 and 3 must be used as the write channels, with switching speeds

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

summed together at the I

level 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

(virtually ground). The current seen at this pin 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 or 3(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

OUTEN R

OUT

OUTEN2

OUTEN3

RFREQ

GND

output, allowing the user to create multi-

INR

IN2

IN3

OUT

shut-off is also achieved by

GND

RAMP

ENABLE

OSCEN

OUT

pin can be biased

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