FN7543 Rev 0.00

Page 1 of 2

September 30, 2011

FN7543

Rev 0.00

September 30, 2011

ISL58315

High Speed Triple Laser Diode Drivers

DATA SHORT

To request the full datasheet, please visit www.intersil.com/products/ISL58315

The ISL58315 is a high-speed, triple-output laser diode driver

(LDD) for laser scanning projector systems, which require three

channels modulated at high speed with independent current

control.

Each output channel provides laser-independent current

control for threshold and color DACs. Separate scale DACs

allow independent scaling of both threshold and color DAC

output values. This allows control of projector brightness and

can be used to simplify automatic power calibration (APC) for

laser-based systems.

Pixel data information is transferred through the LDD's

high-speed 10-bit or 15-bit parallel video interface. Three

parallel interface modes provide flexibility and allow users a

trade-off among speed, power and bus width. Pixel data

employs a double data rate scheme, allowing video data to be

transferred using both clock edges.

Applications

• Laser-based Pico Projectors

• RGB Scanning and Field-based laser projection systems

• Generic laser-based applications requiring multiple,

independently controlled lasers

Related Literature

• See application block diagram for Pico Projector (MEMS) at:

http://www.intersil.com/applications/PicoProjector%28MEMS%29.asp

Features

• High-speed, triple-output laser diode driver supporting up to

720-pixel HD resolution

• Up to 1A of peak current output

• Fast output switching speeds with pulse rise/fall times of

1ns to 2ns for crisp pixels

• Intersil patented laser voltage sampler function provides

dynamic power management capability to dramatically

minimize system power

• Intersil patented SmartLinearizer™ DAC feature provides a

linear transfer function (input video code to green laser

output), eliminating the need for DSP controller processing

algorithms required for non-linear green lasers

• Flexible 10-bit or Intersil patented 15-bit RGB pixel input

formats supported to reduce speed and power. 300MHz

maximum data Input rate supported for 10-bit RGB mode

• Blanking time power reduction reduces LDD current

consumption to 3mA typical

• Programmable return-to-zero (RTZ) function provides

maximum flexibility

• Integrated heater function for SHG green lasers reduces

external components

• Single 3.3V supply and 1.8V video interface compatible for

low power

HE AT E R

ADC

GL U E

LO G IC

DAT A

IN T E RF ACE

AND

R E G IST ER S

SER IA L

IN T E RF ACE

OUTPUT

CHANNEL 3

OUTPUT

CHANNEL 2

OUTPUT

CHANNEL 1

SC L K

D [14..0 ]*

CL K

CE

RT Z

MO N

SEN

SD IO

NC

LO W P

NO T E :

* T H E F O L L O W IN G DAT A L IN E S HAV E AL T E RNAT IV E US E , D E P E NDING O N

RE G IS T E R S E T T ING : D2 = E N3 , D4 = E N 2 , D 6 = E N1 , AN D D1 0 = S Y N C

FIGURE 1. BLOCK DIAGRAM