The VSC7928 is a Vitesse 3.2Gb/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 50 ohms.
The VSC7928 is a high-speed laser diode driver designed for SONET/SDH applications operating up to 3.2Gb/s NRZ data, as well as Full Speed Fibre Channel at 1.062Gb/s. It features a single 5V supply and provides direct access to the external modulation and bias FETs, allowing precise setting of current levels via external components.
The device supports both differential and single-ended inputs with on-chip 50Ω termination for clock and data lines. Key features include an on-chip reclocking register, a multiplexer for clocked or non-clocked applications, and data density monitors to assist in adjusting laser bias for high unbalanced data applications.
| Supply Voltage | Single 5V supply |
|---|---|
| Rise Times | Less than 100ps |
| Total Power Dissipation | 700 mW |
The output rise and fall times are less than 100ps when operating with a current between 20mA and 60mA.
The maximum rated junction temperature for operation is +125°C.