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EL6835

Data Sheet

July 1, 2003

FN7231

PRELIMINARY

Dual 4-Channel Driver with Oscillator &

LVDS

The EL6835 is a high performance,

dual output, laser driver for writeable

‘super-combo’ CD - DVD drives. The

ENA pin enables the chip, while the SEL1 pin selects the

OUT

pin. Various waveforms can be generated where the

amplitude is determined by the currents flowing into I

INR

IN2

, I

IN3

, and I

IN4

. The timing is determined by the signals

at WEN2-WEN2B, WEN3-WEN3B, and WEN4-WEN4B. The

oscillator is enabled when OSEN is high. The amplified I

INR

current of the selected channel is enabled when the ENA pin

is high. The total output current is the sum of the read

current, the enabled write currents, and the oscillator current

when enabled.

Usually a voltage DAC will drive a resistor that is in series

with the I

INR

, I

IN2

, I

IN3

, and I

IN4

input. The resistor allows

the user to optimize the current gain for each channel.

Output write current pulses are enabled when a high is

applied to the WEN2-WEN2B, WEN3-WEN3B, or WEN-

WEN4B pin. The write current will flow to the selected

output. When SEL1 is high I

OUT1

is selected. WENRB

enables read and oscillator current when low.

The R

oscillators frequency is determined by R

FREQ1

FREQ2

, and its amplitude by R

AMP1

or R

AMP2

Features

• Two channels for CD or DVD

• Voltage-controlled output current source requiring one

external set resistor per channel

• Rise time = 0.8ns

• Fall time = 0.8ns

• Channel 2 to 250mA max

• Channel 3 to 150mA max

• Channel 4 to 100mA max

• External 100Ω LVDS termination

• On chip oscillator with frequency and amplitude control by

use of external resistors to ground

• Oscillator frequency to 600MHz

• Oscillator amplitude to 100mA

P-P

• Single +5V supply (±10%)

• Chip ENAs for power savings

Applications

• Super combo drives

Pinout

EL6835

(32-PIN LPP)

TOP VIEW

32 RFREQ1

26 VDDQ

25 VDDN

24 IOUT1

23 IOUT1

22 GND

THERMAL

PAD

21 RAMP1

20 RAMP2

19 VDDN

18 IOUT2

17 IOUT2

OSEN 10

GND 12

NC 13

SEL1 14

ENA 15

GND 16

GND 11

27 GND

28 IINR

31 IIN4

30 IIN3

29 IIN2

Ordering Information

PART

NUMBER

EL6835CL

TEMP. RANGE

0°C to +70°C

PACKAGE

32-Pin LPP

PKG. DWG. #

MDP0046

RFREQ2 1

GND 2

WENRB 3

Get FULL DATASHEET

WEN2 4

WEN2B 5

WEN3 6

WEN3B 7

WEN4 8

WEN4B 9

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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All other trademarks mentioned are the property of their respective owners.

EL6835

All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.

Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality

Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without

notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and

reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result

from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.

For information regarding Intersil Corporation and its products, see www.intersil.com