1

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FN7275

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EL6900

Laser Diode Driver with Waveform

Generator

The EL6900 is a highly integrated

laser diode driver designed to support

Blu-Ray writable optical drives. It

accomplishes this by incorporating a waveform generator

wherein the diode currents and timing details can be

programmed before operation. The data input circuitry

inspects the NRZ serial data waveform and generates

programmed waveforms in recognition of 2, 3, 4, or 5 or

more clock periods of space changing to 2, 3, 4, or 5 or more

clock periods of mark, and vice versa. The part also has an

IV amplifier with concurrent read and write sampling. The

gains of the IV amplifier are programmable, eliminating the

need for external potentiometers.

The architecture allows reprogramming of all output

waveform parameters. The programming is accomplished

through a serial interface port. The clock and NRZ inputs can

be either standard CMOS or LVDS, selectable through a

program bit.

The EL6900 operates on a 5V supply for the analog circuits

and a 3.3V supply for the digital circuits.

Features

• Complete programmable laser diode driver

• 350mA maximum total output

• 8-bit x 8-bit multiplying DAC output provides 8-bit full scale

adjustment and 8-bit resolution at any full scale output

• 120ps timer resolution

• Blu-Ray Disc standard

• Two analog inputs support slope and read APC

to 500MHz

• PLL allows reduced-frequency clock on flex cable

• Separate serial input works up to 25MHz

• Dual sampled IV amplifier with programmable sample

select and gain select

• Programmable HFM offset when HFM is off

Applications

• Blu-Ray ultra-density optical (UDO) drives

• Blu-Ray consumer HDTV video recorders

Pinout

EL6900

(38-PIN QFN)

TOP VIEW

Ordering Information

PART NUMBER

PACKAGE

TAPE & REEL PKG. DWG. #

EL6900CL

38-Pin QFN

-

MDP0046

EL6900CL-T7

38-Pin QFN

7”

MDP0046

EL6900CL-T13

38-Pin QFN

13”

MDP0046

31

30

29

28

27

26

25

1

2

3

4

5

6

7

THERMAL

PAD

SCLK

MON1

RWB

NRZ

NRZB

GND

GND

PDIN

VREF

VSO

IOUT1

IOUT1

GND

VSO

8

9

24

23

VSO

IOUT2

CLKB

CLK

10

11

12

22

21

20

VSL

VSL

VSA

IOUT2

VSO

RSET

Data Sheet

July 15, 2004

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