General Description

The VSC7927 is a single 5V supply, 2.5 Gb/s laser diode driver with direct access to the laser modulation and bias FETs. Laser bias and modulation currents are set by external components allowing precision monitoring and setting of the current levels. Data density outputs are provided to allow the user to adjust the laser bias in high unbalanced data applications. Clock and data inputs are differentially terminated to 50Ω.

Features

• Rise Times of Less Than 100ps

• High Speed Operation

(Up to 2.5 Gb/s NRZ Data)

• Differential or Single-Ended Inputs

• Single Supply

• ECL-Compatible Clock and Data Inputs

• Direct Access to Modulation and Bias FETs

• Data Density Monitors

• On-Chip Reclocking Register

• On-Chip Mux for Clocked or Non-clocked Applications

• On-Chip 50Ω Input Termination: Clock and Data

Applications

• SDH/SONET @ 622Mb/s, 1.244Gb/s, 2.488Gb/s

• Full Speed Fibre Channel (1.062Gb/s)