1
CONFIDENTIAL
High Speed Triple Laser Diode Drivers
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
HEATER
ADC
GLUE
LOGIC
DATA
INTERFACE
AND
REGISTERS
SERIAL
INTERFACE
OUTPUT
CHANNEL 3
OUTPUT
CHANNEL 2
OUTPUT
CHANNEL 1
I
OUT2
I
OUT3
I
OUT1
SCLK
D[14..0]*
CLK
CE
RTZ
MON
R
SET
HTR
HTRREF
V
DD
A
V
SS
A
SEN
SDIO
NC
V
DD
Vss
LOWP
V
SL
NOTE:
* THE FOLLOWING DATA LINES HAVE ALTERNATIVE USE, DEPENDING ON
REGISTER SETTING: D2 = EN3, D4 = EN2, D6 = EN1, AND D10 = SYNC
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
|Copyright Intersil Americas Inc. 2011. All Rights Reserved
Intersil (and design) and SmartLinearizer are trademarks owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
September 30, 2011
FN7543.0
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