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T0806-PEQ PDF预览

T0806-PEQ

更新时间: 2024-02-18 17:26:09
品牌 Logo 应用领域
爱特美尔 - ATMEL 振荡器驱动器射频输出元件
页数 文件大小 规格书
7页 240K
描述
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T0806-PEQ 数据手册

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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 5 V Power Supply  
Common Enable/Disable Input  
TTL/CMOS Control Signals  
Small PB-free QFN16 (4 mm × 4 mm) or SSO16 Package  
3-ChannelLaser  
Driver with  
RF Oscillator  
and 2 Outputs  
Applications  
DVD-ROM with CD-RW Capability (Combo Drives)  
Combo Drives with CD and DVD Writing Capability  
Description  
T0806  
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.  
Summary  
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.  
Figure 1. Block Diagram  
I3  
NE3  
Channel 3  
Channel 2  
IOUTA  
IOUTB  
I2  
NE2  
IR  
Read channel  
RF oscillator  
ENABLE  
ENOSC  
RF  
SELA  
RSA RSB  
Rev. 4522ES–DVD–01/04  

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