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SY88904

Micrel Semiconductor
Part Number SY88904
Manufacturer Micrel Semiconductor
Description FIBER OPTIC MODULE CONTROLLER
Published May 2, 2007
Detailed Description Micrel, Inc. FIBER OPTIC MODULE CONTROLLER WITH APC SY88904 SY88904 FEATURES s DC bias current adjustable to 25mA s ...
Datasheet PDF File SY88904 PDF File

SY88904
SY88904

Overview
Micrel, Inc.
FIBER OPTIC MODULE CONTROLLER WITH APC SY88904 SY88904 FEATURES s DC bias current adjustable to 25mA s Buffered Loss-of-Signal output when used with SY88903 s Controlled laser diode turn on s Laser diode over-current detect s Monitor diode power control circuit s Laser diode driver enable s Designed for use with SY88902 and SY88903 s Single power supply s Available in 16-pin MSOP DESCRIPTION The SY88904 is an integrated controller for the SY88902 Laser Driver and SY88903 Laser Receiver that provides power control and system interface functions for a complete module solution.
The SY88904 is designed to provide the laser diode with an independent DC threshold current (IBIAS) source to assure optimum laser diode performance.
It has special safety features which disable the currents to the laser diode if certain faults are detected in the module.
The SY88904 also provides buffered Loss-of-Signal (LOS) output in open collector level.
The device is designed for fast and accurate calibration of the laser diode as well as deriving the control signals for system integration.
The SY88904 provides for delayed turn on of the laser diode on system start up, chatter-free Loss-of-Signal, Low VCC detect and laser diode over-current situations.
Once the optimal operating point is determined and set for a specific laser diode, the threshold current (IBIAS) is designed to automatically compensate for laser diode aging and module temperature.
APPLICATIONS s s s s s Controller for High Speed Optical Data Transmission 1.
25Gbps Gigabit Ethernet 531 Mbps and 1062Mbps Fibre Channel 622Mbps SONET Gigabit Interface Converter www.
DataSheet4U.
com BLOCK DIAGRAM LOSOUT TTL LOSIN PECL PECL VREF 4 TX_Out II_LIMIT Fault Detect Circuit + ILIMIT SET VREF 3 TX_Fault OC MD_Low + TX_Disable TTL 40X IBIAS + VREF 2 VCC GND MD VCC DET VCC DET 4.
75 RWIN IBIAS SET IBIAS FB IPIN SET VREF M9999-081005 hbwhelp@micrel.
com or (408) 955-1690 Rev.
: B Amendment: /0 1 Issue D...


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