050_342 Datasheet, PDF (7/15 Pages) Glenair, Inc. – PRINTED CIRCUIT BOARD (PCB) MOUNT CWDM TRANSCEIVER

050-342 Product Brief
PCB Mount CWDM Transceiver
100 Mbps – 2.5 Gbps, SMF, 3.3V
Eye Safety Circuit
The Transmitter section provides Class 1 eye safety by design and is compliant with US FDA CDRH AEL Class 1 and
EN(IEC) 60825-1,2, EN60950 Class 1. The eye safety circuit continuously monitors optical output power levels and will
disable the transmitter and assert a TX_FAULT signal upon detecting an unsafe condition. Such unsafe conditions can be
created by inputs from the host board (Vcc fluctuation, unbalanced code) or faults within the module.
RECEIVER SECTION
Receiver Loss of Signal (LOS)
The Loss Of Signal (LOS) output indicates an unusable optical input power level. The post-amplification IC includes
transition detection circuitry which monitors the ac level of incoming optical signals and provides a TTL/CMOS compatible
status signal to the host. A low LOS logic level indicates the presence of an optical input while a high LOS logic level
indicates an unusable optical input. The LOS thresholds are factory-set so that a high output indicates a definite optical
fault has occurred (e.g. failed transmitter, broken or disconnected fiber connection to the transceiver, etc.). The LOS can
also be monitored via the 2-wire serial interface (address A2h, byte 110, bit 1).
FUNCTIONAL I/O
The PCB mount transceiver accepts industry standard differential signals such as LVPECL and CML within the scope of
the SFP MSA. To simplify board requirements, transmitter bias resistors and ac coupling capacitors are incorporated, per
SFF-8074i, and hence are not required on the host board. The module is AC-coupled and internally terminated.
Figure 3 illustrates a recommended interface circuit to link the PCB mount transceiver to the supporting Physical Layer
integrated circuits.
The PCB mount transceiver interfaces with the host circuit board through twenty I/O pins identified by function in Table 7.
The transceiver high speed transmit and receive interfaces requires SFP MSA compliant signal lines on the host board.
The Tx_Disable, Tx_Fault, and Rx_LOS lines require TTL lines on the host board (per SFF-8074i) if used. If an
application chooses not to take advantage of the functionality of these pins, TX_Disable need to be tied to GND, TX_Fault
and RX_LOS do not need to be connected.
Digital Diagnostic Interface and Serial Identification (EEPROM)
The PCB mount transceiver is compatible with the SFF-8074i SFP specification and with SFF-8472, the SFP specification
for Digital Diagnostic Monitoring Interface. Both specifications can be found at http://www.sffcommittee.org.
©2013 Glenair, Inc.
GLENAIR, INC.
www.glenair.com
REV: 2
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US Cage Code 06324
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