General Description
The VSC7938 is a single 3.3V or 5V supply laser diode driver specially designed for SDH/SONET applications up to 3.125Gb/s. External resistors set a wide range of bias and modulation currents for driving the laser.
   
Features
• Power Supply: 3.3V or 5V ±5%
• AC-Coupled to Laser Diode
• Programmable Modulation Current: 5mA to 60mA
• Programmable Bias Current: 1mA to 100mA
• Enable/Disable Control
• Typical Rise/Fall Times of 60ps
• Automatic Optical Average Power Control
• Supply Current of 33mA at 3.3V
   
Applications
• SDH/SONET at 622Mb/s, 1.244Gb/s,
    2.488Gb/s, 3.125Gb/s
• Full-Speed Fibre Channel (1.062Gb/s)