EL6279CU Elantec Inc, EL6279CU Datasheet

EL6279CU

Manufacturer Part Number

EL6279CU

Description

Manufacturer

Elantec Inc

Datasheets

1.EL6279CU.pdf (2 pages)

2.EL6279CU.pdf (2 pages)

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Features

Applications

Ordering Information

• Ultra-Small Package Outline

• Current-controlled output current

• Auto Oscillator On-Off with

• Rise time = 3.0 ns

• Fall time = 3.5 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

• CMOS control signals

• CD-RW applications

• Writable optical drives

• Laser diode current switching

EL6279CU

Part No.

source to 100 mA per channel,

requiring one external set resistor

per channel

OUTEN Signals

and amplitude control by use of

external resistors to ground

protection and power savings

Temp. Range

0°C to +70°C

QSOP-16

Package

MDP0040

Outline #

EL6279C - Product Brief

4-Ch Laser Diode Driver + Oscillator

General Description

The EL6279C is a four channel laser diode current amplifier that pro-

vides controlled current to a grounded laser diode. The four amplifiers

can provide up to 100 mA per channel of DC or pulsed current. Chan-

nels 2, 3, and 4 should be used as the write channels, with switching

speeds of approximately three nanosecond rise/fall time. All four

channels are summed together at the I

create multilevel waveforms in order to optimize laser diode perfor-

mance. 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

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

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

ing the ENABLE pin low, which will override the OUTEN control

pins.

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

modulation when in read mode. The oscillator is enabled when the

OSCEN pin is held high. If any of channels 2, 3, or 4 are active, the

oscillator is switched off. Complete control of amplitude and fre-

quency is set by two external resistors connected to ground at pins

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

explanation).

The external I

dently 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

biased from a current DAC or other current source.

Connection Diagram

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

resistors allow the user to accurately and indepen-

OUTEN4

OUTEN2

OUTEN3

RFREQ

IINR

IIN4

IIN2

IIN3

OUT

shutoff is also achieved by hold-

VCC

IOUT

GND

RAMP

ENABLE

OSCEN

VCC

output, allowing the user to

OUT

pin can be

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