SY88722V Micrel, Inc. 5V/3.3V 622Mbps LASER DIODE SY88722V DRIVER WITH OUTPUT ENABLE FEATURES DESCRIPTION Single 3.3V or 5V power supply The SY88722V is a high speed current switch for driving a semiconductor laser diode in optical transmission Up to 622Mbps operation applications. The modulation current (I ) is controlled by OUT Modulation current to 30mA the current (I ) through the external resistor R . The RSET SET PECL output enable output OUT is HIGH and no current flows through OUT Differential PECL inputs when output enable is HIGH. Available in a tiny 10-pin (3mm) MSOP The device incorporates complementary open collector outputs with a 30mA maximum current driving capability. The external resistor R must be placed between /OUT EXT and V to dissipate the worst case power. R is CC SER recommended to compensate for laser diode matching issues. Pins 9 and 10 should be connected to achieve better performance. The SY88722V utilizes the high performance bipolar APPLICATIONS ASSET technology. 622Mbps SONET FUNCTIONAL BLOCK DIAGRAM V CC R EXT /OUT OUT R SER DIN to Laser Diode /DIN Internal I MOD Logic /EN 40X V CC GND V EE V R REF SET R SET ASSET is a trademark of Micrel, Inc. Rev.: B Amendment: /0 M9999-072505 Issue Date: July 2005 1 hbwhelp micrel.com or (408) 955-1690SY88722V Micrel, Inc. PACKAGE/ORDERING INFORMATION Ordering Information /EN 1 10 OUT Package Operating Package Lead DIN 2 9 OUT Part Number Type Range Marking Finish /DIN 3 8 /OUT SY88722VKC K10-1 Commercial 722V Sn-Pb VREF 4 7 GND (1) SY88722VKCTR K10-1 Commercial 722V Sn-Pb RSET 5 6 VCC SY88722VKG K10-1 Industrial 722V with Pb-Free Pb-Free bar-line indicator NiPdAu 10-Pin MSOP (1) (K10-1) SY88722VKGTR K10-1 Industrial 722V with Pb-Free Pb-Free bar-line indicator NiPdAu Note: 1. Tape and Reel. PIN DESCRIPTION Pin Number Pin Name Pin Function 1 /EN 100k PECL compatible input with 75k pulldown resistor. Modulation current goes to zero when deasserted high. 2, 3 DIN, /DIN Differential 100k PECL compatible input with 75k pulldown resistors. 4 VREF Voltage reference for use with R . SET 5 RSET An external resistor from here to V sets the reference current for I . REF OUT 6 VCC Positive power supply. 7 GND Device ground. 8, 9, 10 /OUT, OUT Differential open collector current outputs. (Note 1) TRUTH TABLE (Note 2) D /D /EN OUT /OUT LH LH L H LLL H XX H H L Notes: 1. L = LOW, H = HIGH, X = don t care. 2. H = I = 0mA. OUT M9999-072505 2 hbwhelp micrel.com or (408) 955-1690