Datasheet > VSC7938R0

VSC7938R0

更新时间： 2024-02-06 21:37:17

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
16页	215K
描述
Laser Diode Driver with Automatic Power Control

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数据手册

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VSC7938R0 数据手册

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

V_CC

LATCH

C_D

IOUT+

IOUT-

C_F

MUX

R_F

DATA+

SET

DATA-

CLK+

CLK-

V_CC

CLR

BIAS

ENABLE

DISABLE

APC

FAIL

1nF

SLWSTRT MODSET

BIASMAX CAPC

APCSET

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

12 3 4 5 6 7...16

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与VSC7938R0相关器件

型号	品牌	获取价格	描述	数据表
VSC7938RO	MICROSEMI	获取价格	Interface Circuit, PQFP48, TQFP-48
VSC7938W	VITESSE	获取价格	Laser Diode Driver with Automatic Power Control
VSC7939	VITESSE	获取价格	Laser Diode Driver with Automatic Power Control
VSC7939RP	VITESSE	获取价格	Laser Diode Driver with Automatic Power Control
VSC7939W	VITESSE	获取价格	Laser Diode Driver with Automatic Power Control
VSC7939-W	MICROSEMI	获取价格	Interface Circuit, DIE-48
VSC7940	VITESSE	获取价格	SONET/SDH 3.125Gb/s Laser Diode Driver with Automatic Power Control
VSC7940RP	VITESSE	获取价格	SONET/SDH 3.125Gb/s Laser Diode Driver with Automatic Power Control
VSC7940W	VITESSE	获取价格	SONET/SDH 3.125Gb/s Laser Diode Driver with Automatic Power Control
VSC7940-W	VITESSE	获取价格	Interface Circuit, 1.773 X 2.233 MM, DIE-48