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P2300-E , TO-92 SIDACtor solid state protection devices protect telecommunications equipment such
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P2300EBL , TO-92 SIDACtor solid state protection devices protect telecommunications equipment such
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ONET4291VARGPR-ONET4291VARGPT
4.25 Gbps VCSEL Driver with Serial Interface
www.ti.com
FEATURES
APPLICATIONS
DESCRIPTION
BLOCK DIAGRAM
ONET4291VASLLS674–SEPTEMBER 2005
GBPS TO 4.25 GBPS MULTI-RATE VCSEL DRIVER Operating Temperature –40°Cto 85°C Multi-Rate Operation from1 Gbps Up •
Small Footprint Surface Mount4 mm×
4 mm, 4.25 Gbps 20-Pin QFN Package 2-Wire Digital Interface Digitally Selectable Modulation Current •
Multirate SFP/SFF Modules•
Digitally Selectable Bias Current •
1.0625 Gbps, 2.125 Gbps, and 4.25 Gbps Fibre•
Automatic Power Control (APC) Loop Channel Transmitters•
Supports Transceiver Management •
Gigabit Ethernet TransmittersSystem (TMS) Includes Laser Safety Features Analog Temperature Sensor Output Single 3.3-V SupplyThe ONET4291VAisa versatile high-speed multi-rate VCSEL driver for fiber optic applications with data ratesup 4.25 Gbps.
The device providesa 2-wire interface which allows digital controlof the modulation and bias currents,
eliminating the need forof external components.
The ONET4291VA includesan integrated automatic power control loopas wellas circuitryto support laser safety
and transceiver management systems.
The partis availableina small footprint4 mm×4 mm 20-pin QFN package andit requiresa single 3.3-V supply.
This power efficient multi-rate VCSEL driveris characterized for operation from –40°C to 85°C ambient
temperature. simplified block diagramof the ONET4291VAis shownin Figure1.
This compact, low power 1-Gbpsto 4.25-Gbps multi-rate VCSEL driver consistsofa 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.
