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VSC7939

更新时间: 2024-01-10 14:28:54
品牌 Logo 应用领域
VITESSE 驱动器二极管激光二极管功率控制
页数 文件大小 规格书
18页 228K
描述
Laser Diode Driver with Automatic Power Control

VSC7939 技术参数

生命周期:Transferred零件包装代码:DFN
包装说明:VQCCN,针数:32
Reach Compliance Code:unknown风险等级:5.65
其他特性:CAN ALSO OPERATE WITH -5.2V SUPPLY接口集成电路类型:INTERFACE CIRCUIT
JESD-30 代码:S-XQCC-N32长度:5 mm
功能数量:1端子数量:32
最高工作温度:85 °C最低工作温度:-40 °C
封装主体材料:UNSPECIFIED封装代码:VQCCN
封装形状:SQUARE封装形式:CHIP CARRIER, VERY THIN PROFILE
认证状态:Not Qualified座面最大高度:0.9 mm
最大供电电压:5.5 V最小供电电压:3.135 V
标称供电电压:3.3 V表面贴装:YES
温度等级:INDUSTRIAL端子形式:NO LEAD
端子节距:0.5 mm端子位置:QUAD
宽度:5 mm

VSC7939 数据手册

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VITESSE  
SEMICONDUCTOR CORPORATION  
Preliminary Data Sheet  
SONET/SDH 3.125Gb/s  
Laser Diode Driver with Automatic Power Control  
VSC7939  
Features  
Applications  
SONET/SDH at 622Mb/s, 1.244Gb/s,  
• Power Supply: 3.3V or 5V ±5%  
2.488Gb/s, 3.125Gb/s  
• AC-Coupled to Laser Diode  
Full-Speed Fibre Channel (1.062Gb/s)  
• Programmable Modulation Current: 5mA to 60mA  
• Programmable Bias Current: 1mA to 100mA  
• Enable /Disable Control  
• Typical Rise/Fall Times of 60ps  
• Automatic Optical Average Power Control  
• Supply Current of 33mA at 3.3V  
General Description  
The VSC7939 is a single 3.3V or 5V supply laser diode driver specially designed for SONET/SDH applica-  
tions up to 3.125Gb/s. External resistors set a wide range of bias and modulation currents for driving the laser.  
Data and clock inputs accept differential PECL signals. The automatic power control (APC) loop maintains a  
constant average optical power over temperature and lifetime. The dominant pole of the APC loop can be con-  
trolled with an external capacitor. Other features include enable/disable control, short-circuit protection for the  
modulation and bias inputs, short rise and fall times, programmable slow-start circuit to set laser turn-on delay,  
and failure-monitor output to indicate when the APC loop is unable to maintain the average optical power. The  
VSC7939 is available in die form or in a 32-pin TQFP package.  
Block Diagram  
VCC  
LATCH  
CD  
IOUT+  
IOUT-  
CF  
RF  
MUX  
DATA+  
DSET  
Q
DATA-  
CLK+  
CLK-  
VCC  
CLRQ  
BIAS  
VCC  
VCC  
ENABLE  
DISABLE  
MODMON  
BIASMON  
APC  
MD  
FAIL  
1nF  
MODSET  
BIASMAX  
CAPC  
APCSET  
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012  
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com  
Internet: www.vitesse.com  
G52350-0, Rev 3.2  
02/26/01  
Page 1  

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