SY88952L

www.DataSheet4U.com Micrel, Inc. 3.3V, 2.7Gbps SDH/SONET LASER DRIVER WITH AUTOMATIC POWER CONTROL DESCRIPTION SY88952L SY88952L FEATURES s s s s s s s s s s Single 3.3V power supply Up to 2.7Gbps operation Rise/Fall times: < 75ps Independent programmable laser modulation and bias currents Bias current to 100mA and modulation current to 90mA Automatic average laser power control Bias and modulation current monitors Operating temperature range of –40°C to +85°C Complies with ANSI, ITU, and Bellcore SDH/SONET specifications Available in DIE form and 32-pin (5mm × 5mm) EPAD-MLF™ package APPLICATIONS s s s s s s OC-48 transceivers and transponders SONET/SDH transmission system Add drop mux Metro area network 2.5Gbps optical transmitter Fiber optical module SY88952L is a highly integrated and programmable laser driver for SONET/SDH application up to 2.7Gbps. The device accepts differential PECL or LVDS data and clock inputs. It provides programmable bias and modulation currents for driving a laser. The modulation output of SY88952L can be DC-coupled to drive the laser diode, providing a significant power saving over ACcoupled operation. A synchronizing TTL input latch can be used to reduce jitter if a clock signal is available. A TTL enable is also incorporated in the device. EN only enables/disables IMOD. It does not enable/disable IBIAS. An automatic power controller (APC) is integrated into SY88952L to maintain a constant average optical output power over temperature and...