atr0842 ATMEL Corporation, atr0842 Datasheet

atr0842

Manufacturer Part Number

atr0842

Description

Atr0842 4-channel Lvds Laser Diode Driver With High Voltage Output For Blue Laser

Manufacturer

ATMEL Corporation

Datasheet

1.ATR0842.pdf (7 pages)

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Features

•

Applications

•

Description

The ATR0842 is a laser diode driver designed to operate two differently grounded

laser diodes. The output, IOUTA, can be used for a blue laser diode (400 nm) with up

to 6 V voltage drop by applying 8 V at pin VCCH. The other output, IOUTB, supports

legacy laser diodes for DVD-RW/+RW/RAM (650 nm) and CD-RW (780 nm). The

device includes four channels for four different optical power levels. The write chan-

nels (channel 2 to 4) can be controlled either by fast LVDS (Low Voltage Differential

Signaling) or by single-ended standard CMOS logic. In case of single-ended use,

each of the enable inputs (NEx or Ex) can be used, the complementary input may be

left open. There is no need for blocking or connection to a reference voltage.

The read function of the channel is to generate a continuous output current, 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 (channels 2 to 4) can contribute up to

350 mA to the total output current of up to 500 mA. The read channel can contribute

up to 150 mA. Total gain of 100 (read channel) and 250 (channel 2, 3 and 4), respec-

tively, are provided between each reference current input and the selected output.

Although the reference inputs are current inputs, voltage control is possible by using

external resistors. 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 is enabled by a high

signal at the ENOSC pin. Complete shut down of the output currents is achieved by a

low signal at the ENABLE input.

In case of uncertain (balanced) enable signals, a built-in protection circuit keeps the

laser diode output current within the defined range.

Current-controlled Output Current Source with 4 Input Channels

Two Selectable Outputs for Grounded Laser Diodes

Output A Suited for Blue Laser Diodes: V

LVDS/CMOS Compatible Inputs Channel 2, 3, and 4

Output Current per Channel up to 350 mA

Total Output Current up to 500 mA

On-chip RF Oscillator

Control of 2 Different Frequencies and Swings by Use of 4 External

Resistors

Oscillator Frequency Range from 200 MHz to 500 MHz

Maximum Oscillator Current Amplitude 100 mApp

Small Pb-free QFN24 4 mm

DVD Blue Laser

DVD-RAM/DVD-RW/DVD+RW with CD-RW Capability

Recordable Optical Drives

4 mm Package

6 V (VCCH 8 V)

4-channel LVDS

Laser Diode

Driver with High

Voltage Output

for Blue Laser

ATR0842

Summary

Rev. 4819AS–DVD–09/04

Related parts for atr0842

atr0842 Summary of contents

Page 1

... Recordable Optical Drives Description The ATR0842 is a laser diode driver designed to operate two differently grounded laser diodes. The output, IOUTA, can be used for a blue laser diode (400 nm) with voltage drop by applying pin VCCH. The other output, IOUTB, supports legacy laser diodes for DVD-RW/+RW/RAM (650 nm) and CD-RW (780 nm) ...

Page 2

... ATR0842 2 Figure 1. Block Diagram I4 E4 Channel 4 NE4 I3 E3 Channel 3 NE3 I2 E2 Channel 2 NE2 IR Channel 1 Read channel ENABLE RF oscillator ENOSC RFA RFB RSA RSB VCCH IOUTA Output A Output B IOUTB SELA 4819AS–DVD–09/04 ...

Page 3

... V power supply for IOUTA +5V power supply Reference current input read channel (input impedance 500 Reference current input channel 2 (input impedance 500 Reference current input channel 3 (input impedance 500 Reference current input channel 4 (input impedance 500 Ground ATR0842 to ground) to ground) to ground) to ground) 3 ...

Page 4

... Note: 1. Measured with multi-layer test board (JDEC standard) Recommended Operating Range Parameters Supply voltage High supply voltage Input current External resistor to GND to set oscillator frequency External resistor to GND to set oscillator swing Operating temperature range ATR0842 4 Symbol Value V -0 ...

Page 5

... Ordering Information Extended Type Number ATR0842-PFQG Package Information 4819AS–DVD–09/04 Package Remarks Lead free QFN24 Taped and reeled ATR0842 5 ...

Page 6

... Fax: (81) 3-3523-7581 Disclaimer: Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Company’s standard warranty which is detailed in Atmel’s Terms and Conditions located on the Company’s web site. The Company assumes no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice, and does not make any commitment to update the information contained herein ...

Page 7

... This datasheet has been download from: www.datasheetcatalog.com Datasheets for electronics components. ...

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