1.25 to 11.1 Gb/s Laser Driver and Limiting Amplifier IC

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The Broadcom AFSI-Q21Q3S is a laser driver and limiting amplifier IC. It provides a single channel of up to 11.1 Gb/s VCSEL compatible electrical output, DC coupled to the anode of the VCSEL, and a programmable limiting amplifier. A Two-Wire Serial (TWS) bus interface enables programmability, register access and Digital Optical Monitoring.


  • Data rates: 1.25 to 11.1 Gb/s 
  • Automatic power control loop
  • 8b/10b to 64b/66b coding for Ethernet and fibre channel applications
  • Programmable TX input PCB equalizer
  • Optical crosspoint adjustment
  • Laser shutdown upon fault (high or low optical power)
  • Lane polarity inversion per channel
  • RX optical and TX electrical squelch on LOS
  • Adjustable output amplitude
  • Single 3.3V supply
  • 5mm x 5mm 32-PIN ROHS compliant QFN package
  • -40 ˚C to 110 ˚C junction operating temperature


  • 1.25 Gb/s to 11.1 Gb/s SR transceivers and Active Optical Cables

Lifecycle Status

Limited Release

Substance Compliance

  • RoHS6
    Fully Compliant
Specification Value
Lifecycle Limited Release
Distrib. Inventory No
Number of Channels 1
Temperature -40˚C + 110˚C
Form Factor QFN
Fiber Type Multimode
RoHS6 Compliant Y
Pwr Supply In V 3.3
Data Rate 10 Gb/s
Product Brief1 i