ONET4291VARGPR Datasheet, PDF (1/23 Pages) Texas Instruments – 1 GBPS TO 4.25 GBPS MULTI-RATE VCSEL DRIVER

ONET4291VA
www.ti.com
SLLS674 – SEPTEMBER 2005
1 GBPS TO 4.25 GBPS MULTI-RATE VCSEL DRIVER
FEATURES
• Multi-Rate Operation from 1 Gbps Up
To 4.25 Gbps
• 2-Wire Digital Interface
• Digitally Selectable Modulation Current
• Digitally Selectable Bias Current
• Automatic Power Control (APC) Loop
• Supports Transceiver Management
System (TMS)
• Includes Laser Safety Features
• Analog Temperature Sensor Output
• Single 3.3-V Supply
• Operating Temperature –40°C to 85°C
• Small Footprint Surface Mount 4 mm × 4 mm,
20-Pin QFN Package
APPLICATIONS
• Multirate SFP/SFF Modules
• 1.0625 Gbps, 2.125 Gbps, and 4.25 Gbps Fibre
Channel Transmitters
• Gigabit Ethernet Transmitters
DESCRIPTION
The ONET4291VA is a versatile high-speed multi-rate VCSEL driver for fiber optic applications with data rates up
to 4.25 Gbps.
The device provides a 2-wire interface which allows digital control of the modulation and bias currents,
eliminating the need for of external components.
The ONET4291VA includes an integrated automatic power control loop as well as circuitry to support laser safety
and transceiver management systems.
The part is available in a small footprint 4 mm × 4 mm 20-pin QFN package and it requires a single 3.3-V supply.
This power efficient multi-rate VCSEL driver is characterized for operation from –40°C to 85°C ambient
temperature.
BLOCK DIAGRAM
A simplified block diagram of the ONET4291VA is shown in Figure 1.
This compact, low power 1-Gbps to 4.25-Gbps multi-rate VCSEL driver consists of a high-speed current
modulator, a modulation current generator, power-on reset circuitry, a 2-wire interface and control logic block, a
bias current generator and automatic power control loop, and an analog reference block.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2005, Texas Instruments Incorporated