V23818-M305-B57 Datasheet, PDF (6/19 Pages) Infineon Technologies AG – SFP - Small Form-factor Pluggable Multimode 850 nm 2.125 and 1.0625 Gbit/s Fibre Channel 1.25 Gigabit Ethernet Transceiver with LC™ Connector

V23818-M305-B57
Description
The receiver component converts the optical serial data into LVPECL compatible
electrical data (RD+ and RD–). The Loss Of Signal (LOS) shows whether an optical
signal is present.
The transmitter converts LVPECL compatible electrical serial data (TD+ and TD–) into
optical serial data. Data lines are differentially 100 W terminated.
The transmitter contains a laser driver circuit that drives the modulation and bias current
of the laser diode. The currents are controlled by a power control circuit to guarantee
constant output power of the laser over temperature and aging. The power control uses
the output of the monitor PIN diode (mechanically built into the laser coupling unit) as a
controlling signal, to prevent the laser power from exceeding the operating limits.
Single fault condition is ensured by means of an integrated automatic shutdown circuit
that disables the laser when it detects laser fault to guarantee the laser Eye Safety.
The transceiver contains a supervisory circuit to control the power supply. This circuit
makes an internal reset signal whenever the supply voltage drops below the reset
threshold. It keeps the reset signal active for at least 140 milliseconds after the voltage
has risen above the reset threshold. During this time the laser is inactive.
A low signal on TxDis enables transmitter. If TxDis is high or not connected the
transmitter is disabled.
The information which kind of SFP module has been plugged into an SFP port can be
read through the MOD-DEF interface. The information is stored in an I²C-Eprom inside
the SFP Transceiver.
Data Sheet
6
2003-04-25