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)