SY88922V

Micrel, Inc. 5V/3.3V 2.5Gbps LASER DIODE DRIVER SY88922V SY88922V FEATURES ■ ■ ■ ■ ■ ■ ■ ■ Up to 2.5Gbps operation 30mA modulation current Separate modulation control Separate output enable for laser safety Differential inputs for data 75KΩ input pull-down resistor 3.3V and 5V power supply options Available in a tiny 10-pin (3mm × 3mm) MSOP DESCRIPTION The SY88922V is a high-speed current switch for driving a semiconductor laser diode in optical transmission applications. The modulation current (IOUT) is controlled by the current (IRSET) through the external 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 30mA. The resistor REXT must be placed between /OUT and V CC to dissipate the worst case power. R SER is recommended to compensate for laser diode matching issues. Pin 9 and pin 10 should be connected to achieve better performance. The SY88922V utilizes the high-performance bipolar ASSET™ technology. All support documentation can be found on Micrel’s web site at www.micrel.com. APPLICATIONS ■ ■ ■ ■ ■ ■ 1.25Gbps and 2.5Gpbs Gigabit Ethernet 531Mbps, 1062Mbps and 2.12Gbps Fibre Channel 622Mbps SONET Gigabit Interface Converter 2.5Gbps SDH/SONET 2.5Gbps Proprietary Links www.DataSheet4U.com BLOCK DIAGRAM VCC REXT /OUT OUT RSER DIN /DIN IMOD /EN BIAS Control Internal Logic to Laser Diode 40X VCC GND GND Modulation Control RSET VREF RSET ASSET ...