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DATASHEET

To request the full datasheet, please visit www.intersil.com/products/isl58797

Laser Diode Driver with Write Current DAC and PDIC

Control Outputs

ISL58797

The ISL58797 is a highly integrated, single supply laser diode

driver designed to support multi-standard writable optical drives

in CD, DVD, and Blu-Ray formats at various speeds. It is a ‘hybrid’

part having an interface compatible with a conventional LDD, but

an internal architecture similar to a write strategy LDD. This

combination adds versatility to the conventional interface. The

ISL58797 also features PDIC (OEIC) control pins; which help

reduce the signal lines on the Flex cables.

The rise time, fall time and overshoot of all outputs are

adjustable to compensate for high and low resistance lasers.

The ISL58797 architecture includes dual write current banks,

which can be selected using the bank select line, BSEL. This

eliminates the need to synchronize the serial port to the media.

The oscillator is internally activated through program assignment

to attach to any WEN state.

The WEN lines have internal 100Ω termination resistors. There is

a skew detector on the WEN receiver outputs.

Applications

• Combination DVD, CD, and Blue Writable Drives

•BD Camcorders

•BD Video Recorders

Features

• Compatible with all Conventional Controllers Having a Serial

Port, with Some Programming

• Programmable Snubber on all Outputs

• PDIC (OEIC) Control Pins

• Compatible with Controllers Having Gray Coded WEN Lines for

Glitchless High-Speed Operation

• WEN Line Skew Detection

• 1000mA Maximum Total Write Output Current

• 10-bit x 10-bit Multiplying DAC Output Provides 10-bit

Full-Scale Adjustment and 10-bit Resolution at any Full-Scale

Output

• Three Laser Outputs Allow Read/Write DVD, CD, and Blue

Combinations

• Single +5V Supply

• Analog Inputs Supports Slope and Read APC

100MHz to >1GHz

• Programmable HFM On, Off and Cooling Levels

• Programmable Spread Spectrum for Low EMI

• Built-in ADC to Sample Laser Voltage Allows Power Reduction

by Optimizing Headroom

• Built-in Thermal Sensor Aids in Thermal Design

• Serial Input Works up to 50MHz

• Pb-Free (RoHS Compliant)

FIGURE 1. SIMPLIFIED BLOCK DIAGRAM

SPI

Interface

Blue

WDAC

WDAC 2

WDAC1

IOUT2

IOUT1

WEN0 (LVDS)

ENA

BSEL

SEN

VSO

GND

WEB

Data

Interface

&

Registers

Scale

DAC

SCLK

SDIO

WEN1 (LVDS)

WEN2 (LVDS)

Read

DAC

Red Laser

IR Laser

IAPC

ISLOPE

READ

IBLUE

V_Blue LD

April 26, 2012

FN7984.0

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

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