Description
The CXB1828ER is a high-speed monolithic laser diode driver. This IC can drive the data rate of 2.5Gbps and the modulation current of up to 50mA. The bias current of up to 50mA can be supplied and it is controlled by the built-in APC (automatic power control). The modulation current and bias current are designed to be linearly controlled by the voltage input to the control pin.
This IC has a built-in DFF, and through mode or DFF mode can be selected. In through mode the signal goes as it is, and in DFF mode the input signal is retimed by the external clock. The data input pin and the clock input pin can accept the differential input of PECL and CML, and the 50Ω termination resistors are provided in the IC.

Features
• Direct laser diode drive
• Maximum data rate of 2.5Gbps
• Power-on reset function
• Automatic power control (APC) for bias current
• Alarm function and shutdown function
• Differential PECL and CML inputs or AC coupled input
• Internal duty cycle correction circuit
• Activity error detector function for laser safety
• Typical rise time is 80ps.
• Built-in 50Ω input termination resistor
• Compact package size: 4.8mm × 4.8mm
• Single +3.3V supply voltage

Applications
• Gigabit ethernet: 1.25Gbps
• SONET/SDH: 622Mbps, 2.5Gbps