OC-3 Datasheet, PDF (7/10 Pages) List of Unclassifed Manufacturers – 1310 nm Single-mode Transceiver (S1.1) 1x9, SC Duplex Connector, 3.3 V

1310 nm Single-mode Transceiver (S1.1)
1x9, SC Duplex Connector, 3.3 V
155 Mbps ATM/SONET OC-3/SDH STM-1
Recommended Circuit Schematic
DC/DC Coupling
Laser
Driver
9 ^{TX GND}
8 TD+
7 TD−
RiteKom Transceiver
6 VCCT
5 VCCR
L1
C1
L2
C2
LIMITING
Signal detect
4 SD
Pre-
Amplifier
Amp
3 RD−
2 RD+
1 ^{RX GND}
V_CC
C4
V_CC
C3
TD+
ECL/PECL
TD−
DRIVER
Serializer/
Deserializer
RD−
Receiver
PLL etc.
RD+
C1/C2/C4 = 0.1 µF
L1/L2 = 1 µH
R1/R3/R5/R7/R9 = 130 Ω
C3 = 4.7 µF
R2/R4/R6/R8/R10 = 82 Ω
In order to get proper functionality, a recommended circuit is provided in above recommended circuit schematic.
When designing the circuit interface, there are a few fundamental guidelines to follow.
(1) The differential data lines should be treated as 50 Ω Micro strip or strip line transmission lines. This will help to minimize
the parasitic inductance and capacitance effects. Locate termination at the received signal end of the transmission line. The
length of these lines should be kept short and of equal length.
(2) For the high speed signal lines, differential signals should be used, not single-ended signals, and these differential signals
need to be loaded symmetrically to prevent unbalanced currents which will cause distortion in the signal.
(3) Multi layer plane PCB is best for distribution of V_CC, returning ground currents, forming transmission lines and shielding,
Also, it is important to suppress noise from influencing the fiber-optic transceiver performance, especially the receiver
circuit.
(4) A separate proper power supply filter circuits shown in Figure for the transmitter and receiver sections. These filter
circuits suppress Vcc noise over a broad frequency range, this prevents receiver sensitivity degradation due to V_CC noise.
(5) Surface-mount components are recommended. Use ceramic bypass capacitors for the 0.1 µF capacitors and a
surface-mount coil inductor for 1 µH inductor. Ferrite beads can be used to replace the coil inductors when using quieter
V_CC supplies, but a coil inductor is recommended over a ferrite bead. All power supply components need to be placed
physically next to the V_CC pins of the receiver and transmitter.
(6) Use a good, uniform ground plane with a minimum number of holes to provide a low-inductance ground current return
for the power supply currents.
http:// www.ritekom.com
Version 3.3
Headquarters :
No. 669, Sec. 4 Chung Hsing Road
Chudung, HsinChu, Taiwan 310, ROC
Tel: [phone]
Fax: [phone]
7/10
Date: 2003/02/17