Texas Instruments ONEt4291VA Data Sheet / User's Guide
Summary
The ONET4291VA is a versatile, high-speed multi-rate VCSEL driver engineered for demanding fiber optic transmission applications up to 4.25 Gbps. This compact component streamlines design by offering digital control over both modulation and bias currents through an integrated two-wire interface. The manual provides comprehensive details on its advanced architecture, including automatic power control (APC) loop technology and built-in laser safety features. It is essential for engineers developing robust SFP/SFF modules or Gigabit Ethernet transmitters needing reliable performance in thermally fluctuating environments (-40°C to 85°C).
Page 1 Text Content
查询ONET4291VA供应商
ONET4291VA
www.ti.com
SLLS674–SEPTEMBER
GBPS TO 4.25 GBPS MULTI-RATE VCSEL DRIVER
FEATURES Operating Temperature –40°C to 85°C
Multi-Rate Operation from Gbps Up Small Footprint Surface Mount mm mm,
To 4.25 Gbps 20-Pin QFN Package
2-Wire Digital Interface
APPLICATIONS
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 Transmitters
System (TMS)
Includes Laser Safety Features
Analog Temperature Sensor Output
Single 3.3-V Supply
DESCRIPTION
The ONET4291VA is versatile high-speed multi-rate VCSEL driver for fiber optic applications with data rates up
to 4.25 Gbps.
The device provides 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 small footprint mm mm 20-pin QFN package and it requires 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
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 high-speed current
modulator, modulation current generator, power-on reset circuitry, 2-wire interface and control logic block,
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. Copyright 2005, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Page Summary Contents For Texas Instruments ONEt4291VA Data Sheet / User's Guide
Manual Details
| Brand | Texas Instruments |
|---|---|
| Pages | 21 |
| File Size | 580.58 KB |
| Published | June 20, 2026 |
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Frequently Asked Questions
What is the maximum operating temperature range for this device?
It is characterized for operation from –40°C to 85°C ambient temperature.
How does the ONET4291VA provide digital control over current settings?
The modulation and bias currents are digitally controlled via a 2-wire interface, eliminating the need for external components.
What voltage supply is required to power the VCSEL driver?
The device requires a single 3.3-V supply.
Does the ONET4291VA include safety or optimization features?
Yes, it includes an automatic power control (APC) loop and circuitry to support laser safety and transceiver management systems.