V23818-M305-L57 Datasheet, PDF (5/15 Pages) Infineon Technologies AG – Small Form Factor Multimode 850 nm 2.125 and 1.0625 GBd Fibre Channel 2x5 Transceiver with LC™ Connector

V23818-M305-L57
Description
Functional Description of 2x5 Pin Row Transceiver
This transceiver is designed to transmit serial data via multimode cable.
TDis
TD−
TD+
Automatic
Shut-Down
LEN
Laser
Driver
RD−
RD+
SD
Power
Control
Monitor
Receiver
Laser
Coupling Unit
e/o
Laser
o/e
Multimode Fiber
Rx Coupling Unit
o/e
Figure 2 Functional Diagram
The receiver component converts the optical serial data into PECL compatible electrical
data (RD+ and RD–). The Signal Detect (SD, active high) shows whether an optical
signal is present.
The transmitter converts PECL compatible electrical serial data (TD+ and TD–) into
optical serial data. Data lines are differentially 100 Ω 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 the transmitter is disabled.
Data Sheet
5
2002-03-21