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VSC7938RO PDF预览

VSC7938RO

更新时间: 2024-02-05 06:14:06
品牌 Logo 应用领域
美高森美 - MICROSEMI 接口集成电路
页数 文件大小 规格书
16页 213K
描述
Interface Circuit, PQFP48, TQFP-48

VSC7938RO 技术参数

是否Rohs认证: 不符合生命周期:Transferred
包装说明:LFQFP, QFP48,.35SQ,20Reach Compliance Code:unknown
风险等级:5.66接口集成电路类型:INTERFACE CIRCUIT
JESD-30 代码:S-PQFP-G48JESD-609代码:e0
长度:7 mm功能数量:1
端子数量:48最高工作温度:85 °C
最低工作温度:-40 °C封装主体材料:PLASTIC/EPOXY
封装代码:LFQFP封装等效代码:QFP48,.35SQ,20
封装形状:SQUARE封装形式:FLATPACK, LOW PROFILE, FINE PITCH
电源:3.3/5 V认证状态:Not Qualified
座面最大高度:1.6 mm子类别:Display Drivers
最大供电电压:5.25 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端子面层:Tin/Lead (Sn/Pb)
端子形式:GULL WING端子节距:0.5 mm
端子位置:QUAD宽度:7 mm

VSC7938RO 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  
VSC7938  
Features  
Applications  
SDH/SONET at 622Mb/s, 1.244Gb/s,  
2.488Gb/s, 3.125Gb/s  
• Power Supply: 3.3V or 5V ±5%  
• 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 VSC7938 is a single 3.3V or 5V supply laser diode driver specially designed for SDH/SONET 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  
VSC7938 is available in die form or in a 48-pin TQFP package.  
Block Diagram  
3.3V Operation  
VCC  
LATCH  
CD  
IOUT+  
IOUT-  
CF  
MUX  
RF  
DATA+  
SET  
D
Q
DATA-  
CLK+  
CLK-  
VCC  
Q
CLR  
BIAS  
ENABLE  
DISABLE  
MD  
APC  
FAIL  
1nF  
SLWSTRT 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  
G52349-0, Rev 3.0  
01/20/01  
Page 1  

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