DESCRIPTION

The SY88922 is a high-speed current switch for driving a semiconductor laser diode in optical transmission applications. The output current, or modulation current IMOD, is DC current controlled by IRSET, current through the resistor RSET. The output OUT is HIGH when output enable is HIGH.

The device incorporates complementary open collector outputs with a capability of driving peak current of 25mA. The resistor REXT must be placed between /OUT and VCC to dissipate the worst case power. RSER is recommended to compensate for laser diode matching issues.

The SY88922 utilizes the high performance bipolar ASSET™ technology.

FEATURES

■ Up to 2.5Gbps operation

■ 25mA peak drive current

■ Separate modulation control

■ Separate output enable for laser safety

■ Differential inputs for data

■ 75KΩ input pulldown resistor

■ Designed for use with SY88923, SY88904 or SY88905

■ Available in a tiny 10-pin (3mm) MSOP

APPLICATIONS

■ 1.25Gbps Gigabit Ethernet

■ 531Mbps and 1062Mbps Fibre Channel

■ 622Mbps SONET

■ Gigabit Interface Converter

■ 2.5Gb/s SDH/SONET