T0806 datasheet, PDF - EEWORLD Datasheet

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T0806: Description3-channel Laser Driver with RF Oscillator and 2 Outputs; File Size236KB，8 Pages; ManufacturerAtmel (Microchip)

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T0806 Overview

3-channel Laser Driver with RF Oscillator and 2 Outputs

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Features

•

Current-controlled Output Current Source, 3 Input Channels

Two Selectable Outputs for Grounded Laser Diodes

Output Current per Channel up to 250 mA

Total Output Current to 300 mA (Minimum)

Rise Time 1.0 ns, Fall Time 1.1 ns

On-chip RF Oscillator

Control of 2 Different Swings by Use of 2 external Resistors

Oscillator Frequency Range from 200 MHz to 600 MHz

Oscillator Swing to 100 mA

Single 5V Power Supply

Common Enable/Disable Input

TTL/CMOS Control Signals

Small PB-free QFN16 (4 mm

4 mm) or SSO16 Package

3-channel Laser

Driver with RF

Oscillator and

2 Outputs

T0806

Summary

Applications

•

DVD-ROM with CD-RW Capability (Combo Drives)

•

Combo Drives with CD and DVD Writing Capability

1. Description

The T0806 is a laser diode driver for the operation of two different grounded laser

diodes for DVD-RAM (650 nm) and CD-RW (780 nm) drives. It includes three chan-

nels for three different optical power levels which are controlled by a separate IC. The

read channel generates a continuous output level whereas channels 2 and 3 are pro-

vided as write channels with very fast switching speeds. Write current pulses are

enabled when a low signal is applied to the NE pins. All channels are summed

together and switched to one of the two outputs IOUTA or IOUTB by the select input

SELA. Each channel can contribute up to 250 mA to the total output current of up to

300 mA. A total gain of 100 is 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 provided to reduce laser mode hopping noise during read

mode. Swing can be set independently for the two selectable outputs with two differ-

ent resistors. Oscillation is enabled by a high signal at the ENOSC pin. Complete

output current and oscillator switch-off is achieved by a low signal at the ENABLE

input.

Rev. 4522FS–DVD–11/05

Note:

This is a summary document. A complete dorcument

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

tact your local Atmel sales office.

T0806 Related Products

	T0806	T0806_05
Description	3-channel Laser Driver with RF Oscillator and 2 Outputs	3-channel Laser Driver with RF Oscillator and 2 Outputs

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