NOTE: This is a summary document.
The complete document is available
under NDA. For more information,
please contact your local Atmel sales
office.
Features
• Three Selectable Outputs
• All Outputs Can Be Used Either for Standard (5V) or High Voltage (9V)
• Maximum Output Current at All Outputs Up to 150 mA
• On-chip Low-EMI RF Oscillator With Spread-spectrum Technology
• Control of 3 Different Swings Using 3 External Resistors
• Oscillator Frequency Range from 200 MHz to 500 MHz
• Maximum Oscillator Current Amplitude 100 mA
pp
• On-chip High-gain Transimpedance (IV) Amplifier
• Small Green QFN24 4 mm × 4 mm Package
Applications
• HD-DVD/DVD/CD ROM Drives
• Blu-ray/DVD/CD ROM Drives
• HD-DVD/DVD/CD Player
• Blu-ray/DVD/CD Player
1. Description
ATR0885 is a laser diode driver designed to operate three different grounded or float-
ing laser diodes for reading CDs (λ = 780 nm), DVDs (λ = 650 nm), and
HD-DVDs/Blu-ray (λ = 405 nm). An on-chip, low-EMI RF oscillator is available to
reduce laser mode hopping noise. The oscillator’s current amplitude can be set inde-
pendently for the three selectable outputs using three resistors (RSA, RSB, RSC).
The frequency setting is common to all IOUT outputs via a single resistor (RF). A logic
high level on the ENOSC pin enables the spread-spectrum RF oscillator. The
ATR0885 also includes a fast-settling transimpedance amplifier. It is provided to inter-
face between the front-end monitor photo diode and the adaptive laser diode power
control circuit. The gain of the transimpedance amplifier can set independently for
each of the three outputs using the resistors RTIA, RTIB and RTIC.
3-output Laser
Driver for
HD-DVD/
Blu-ray/DVD/
CD-ROM
ATR0885
Preliminary
Summary
4923CS–DVD–02/08
