atr0839 ATMEL Corporation, atr0839 Datasheet

atr0839

Manufacturer Part Number

atr0839

Description

Atr0839 4-channel Lvds Laser Driver For Dual-layer Application

Manufacturer

ATMEL Corporation

Datasheet

1.ATR0839.pdf (6 pages)

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Features

•

Applications

•

1. Description

The ATR0839 is a laser diode driver designed to operate two different grounded laser

diodes for DVD-RW/DVD+RW (650 nm) and CD-RW (780 nm). The device includes

four channels for four different optical power levels. The write channels (channels 2

to 4) can be controlled by fast LVDS (Low Voltage Differential Signaling).

The read channel generates a continuous output current, whereas channels 2 to 4 are

designed as write channels with very fast switching speed. All channels are summed

together and routed to one of the two outputs, IOUTA or IOUTB, controlled by the

select input, SELA. Each write channel (channel 2 to 4) can contribute up to 350 mA

to the total output current of up to 600 mA. The read channel can contribute up to

150 mA. Total gains of 100 (read channel) and 250 (channels 2, 3 and 4), are pro-

vided between each reference current input and the selected output. Although the

reference inputs are current inputs, voltage control is possible by using external resis-

tors. An on-chip RF oscillator is available to reduce laser-mode hopping noise during

read mode. The oscillator current amplitude can be set independently for the two

selectable outputs with two different resistors. Oscillation can be enabled either by

LVDS signaling at ENOSC/NENOSC pins, or by a high at ENOSC pin in single-ended

mode. Complete shutdown of the output currents is achieved by a low signal at the

ENABLE input.

In read mode, the reference currents (I2, I3, I4) should be switched off to reduce

power consumption.

In case of uncertain (balanced) enable signals, a built-in fail-safe circuit will reduce the

laser diode output current to a safe value.

Current-controlled Output Current Source with 4 Input Channels

LVDS Compatible Inputs at Channels 2, 3 and 4 with On-chip 100 Termination

Separate Read-channel Enable

Two Selectable Outputs for Grounded Laser Diodes

Output Current per Channel up to 350 mA

Total Output Current up to 600 mA

On-chip RF Oscillator with LVDS Enable

Control of 2 Different Swings and Frequencies by use of 4 External Resistors

Oscillator Frequency Range from 200 MHz to 500 MHz

Maximum Oscillator Current Amplitude 100 mApp

Single 5V Power Supply

Small Pb-free QFN24, 4 mm

Double Layer DVD+/-RW with CD-RW Capability

Recordable Optical Drives

4 mm Package

Note: This is a summary document. A complete dorcument

is available under NDA. For more information, please con-

tact your local Atmel sales office.

4-Channel LVDS

Laser Driver for

Dual-layer

Application

ATR0839

Summary

Rev. 4852BS–DVD–09/05

Related parts for atr0839

atr0839 Summary of contents

Page 1

... Recordable Optical Drives 1. Description The ATR0839 is a laser diode driver designed to operate two different grounded laser diodes for DVD-RW/DVD+RW (650 nm) and CD-RW (780 nm). The device includes four channels for four different optical power levels. The write channels (channels can be controlled by fast LVDS (Low Voltage Differential Signaling). ...

Page 2

... Figure 1-1. ATR0839 2 Block Diagram I4 E4 Channel 4 100 NE4 I3 E3 Channel 3 100 NE3 I2 E2 Channel 2 100 NE2 IR Channel 1 NER Read channel ENABLE RF oscillator ENOSC NENOSC RFA RFB RSA RSB IOUTA IOUTB SELA 4852BS–DVD–09/05 ...

Page 3

... High: selects IOUTA, RSA, RFA Low: selects IOUTB, RSB, RFB +5V power supply Input current, bias voltage approximately GND Input current, bias voltage approximately GND Input current, bias voltage approximately GND Input current, bias voltage approximately GND Ground, negative power supply ATR0839 3 ...

Page 4

... Measured with multi-layer test board (JDEC standard) 5. Recommended Operating Range Parameters Supply voltage Input current Voltage between LVDS inputs (E2/NE2, E3/NE3, E4/NE4) External resistor to GND to set oscillator frequency External resistor to GND to set oscillator swing Operating temperature range ATR0839 4 Symbol dmax P ...

Page 5

... Ordering Information Extended Type Number ATR0839-PFQW 7. Package Information 4852BS–DVD–09/05 Package Pb-free QFN24 ( mm) ATR0839 Remarks Taped and reeled 5 ...

Page 6

... Atmel products are not suitable for, and shall not be used in, automotive applications. Atmel’s products are not intended, authorized, or warranted for use as components in applications intended to support or sustain life © Atmel Corporation 2005. All rights reserved. Atmel marks or trademarks of Atmel Corporation or its subsidiaries. Other terms and product names may be trademarks of others. Atmel Operations Memory ...

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