Datasheet > T0820_05

T0820_05

更新时间： 2022-09-23 20:26:49

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
12页	266K
描述
4-channel Laser Driver with RF Oscillator

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T0820_05 数据手册

Features

•

Current-controlled Output Current Source with 4 Input Channels

Low-power Consumption

Output Current up to 150 mA, Read Channel and Channel 2

Output Current up to 200 mA, Channel 3 and Channel 4

Total Output Current to 300 mA

Rise Time 1.0 ns, Fall Time 1.1 ns

4-channel Laser

Driver with RF

Oscillator

On-chip RF Oscillator

Control Frequency and 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

T0820

Small SSO16 Package

Application

•

DVD-RAM

DVD-RW

DVD+RW

CD-RW

Writable Optical Drives

1. Description

The T0820 is a laser diode driver for the operation of a grounded laser diode for

writable optical drives. It includes four channels for four different optical power levels

which are controlled by a separate IC. The read channel generates a continuous

output level whereas channels 2 to 4 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 at the IOUT pin. Read channel and

channel 2 can contribute up to 150 mA and channels 3 and 4 up to 200 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. Frequency and swing can be

set by two external resistors. Oscillation is enabled by a "high" at the ENOSC pin.

Complete output current and oscillator switch-off is achieved by a `low' at the ENABLE

input.

Rev. 4506G–DVD–11/05

12 3 4 5 6 7...12

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