Datasheet > ATR0808-TCQG

ATR0808-TCQG

更新时间： 2024-09-23 08:39:59

品牌	Logo	应用领域
爱特美尔 - ATMEL		振荡器驱动器射频
页数	文件大小	规格书
8页	237K
描述
Three Channel Laser Driver with RF Oscillator and Two Outputs

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中文翻译

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数据手册

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ATR0808-TCQG 数据手册

Features

• Current-controlled Output Current Source with 3 Input Channels

• Two Selectable Outputs for Grounded Laser Diodes

• Output Current per Write Channel: 350 mA

• Total Output Current: 500 mA

• 200 Ω Channel Input Resistance

• On-chip RF Oscillator

• Control of Two Different Swings by Use of Two External Resistors

• Oscillator Frequency Range from 200 MHz to 500 MHz

• Oscillator Swing: 100 mA

• Single 5 V Power Supply

• Common Enable/Disable Input

• TTL/CMOS Control Signals

• Small Pb-free QFN16 (4 mm × 4 mm) or SSO16 Package

Three Channel

Laser Driver

with RF

Oscillator and

Two Outputs

Applications

• DVD-ROM with CD-RW Capability

• DVD+RW with CD-RW Capability

• DVD-RW with CD-RW Capability

• Writable Optical Drives

ATR0808

Summary

Description

The ATR0808 is a laser diode driver for the operation of two different grounded laser

diodes for DVD-RW/DVD+RW (650 nm) and CD-RW (780 nm). 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 the channels 2 and 3 are

provided 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 IOUTA or IOUTB outputs by the select input

SELA. Each write channel (channel 2 and 3) can contribute up to 350 mA to the total

output current, up to 500 mA. The read channel can contribute up to 150 mA. Total

gains of 100 (read channel), 250 (channel 2 and 3) are provided between each refer-

ence 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 different 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. 4724ES–DVD–01/04

12 3 4 5 6 7 8

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