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C-127-2500-FDFB-SLC2 Datasheet(PDF) 4 Page - Source Photonics, Inc.

Part No. C-127-2500-FDFB-SLC2
Description  2.5 Gbps Single Mode SFF LC Transceiver
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Maker  SOURCE [Source Photonics, Inc.]
Homepage  http://www.sourcephotonics.com
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2.5 Gbps Single Mode SFF LC Transceiver
C-1XX-2500(C)-FDFB-SLCX
20550 Nordhoff St. • Chatsworth, CA 91311 • tel: 818.773.9044 • fax: 818.576.9486
9F, No 81, Shui Lee Rd. • Hsinchu, Taiwan, R.O.C. • tel: 886.3.5169222 • fax: 886.3.5169213
LUMNDS851-Jul2005
rev. A.0
LUMINENTOIC.COM
Recommended Circuit Schematic
Inputs to the C-1XX-2500(C)-FDFB-SLCX series transmitters are AC coupled and internally terminated through 50 ohms to AC ground.
These transceivers can operate with LVPECL or CML logic levels. The input signal must have at least a 200 mV peak to (single ended) signal
swing. Output from the receiver section of the module is also AC coupled and is expected to drive into 50 ohm load. Different termination
strategies may be required depending on the particular Serializer / Deserializer chip set used.
The C-1XX-2500(C)-FDFB-SLCX series product family are designed with AC coupled data inputs and outputs to provide the following
advantages:
Close positioning of SERDES with respect to transceiver; allows for shorter line lengths and at gigabit speeds reduces EMI.
Minimum number of external components.
Internal termination reduces the potential for unterminated stubs which would otherwise increase jitter and reduce transmission
margin.
Figure 1 & Figure 2 illustrates the recommended transmit and receive data line trminations for SERDES with CML and LVPECL Inputs / Outputs
respectively.
BIAS
PIN
RECEIVER
TZ
AMP
AMP
POST
RD -
RD +
TD -
TD +
Z=50�
Z=50�
Z=50�
Z=50�
See
Fig. 4A
See
Fig. 3
Note �
DRIVER
LASER
TRANSMITTER
RX_GND
RX_D
RX_D
SD
Vcc_RX
Vcc_TX
TX_D
TX_D
TX_GND
TX_DIS
5
4
3
6
2
�0
9
7
8
TTL logic level
Serializer / De-Serializer
with CML lnputs/Outputs
Figure 1.Recommended TRANSMIT and RECEIVE Data Terminations for SERDES with CML I/Os.
Note 1. Consult SERDES manufacturer’s data sheet and application data for appropriate receiver input biasing network.
Some deserializer inputs are internally terminated and may not need external termination resistors.




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