AFCT-5815DZ Avago Technologies US Inc., AFCT-5815DZ Datasheet - Page 3

• Manufacturer Part Number: AFCT-5815DZ
• Description: TXRX OPT SM 155MBS SONET OC3/SDH
• Manufacturer: Avago Technologies US Inc.

Specifications of AFCT-5815DZ

• Applications: General Purpose
• Data Rate: 155Mbps
• Wavelength: 1300nm
• Voltage - Supply: *
• Connector Type: SC
• Mounting Type: Through Hole
• Data Rate Max: 0.155Gbps
• Supply Voltage: 5V
• Wavelength Typ: 1300nm
• Leaded Process Compatible: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Recommended Circuit Schematic
In order to ensure proper functionality of the
AFCT-5815xZ a recommended circuit is provided
in Figure 3. When designing the circuit interface,
there are a few fundamental guidelines to follow.
For example, in the Recommended Circuit
Schematic figure the differential data lines should
be treated as 50 ohm Microstrip or stripline
transmission lines. This will help to minimize
the parasitic inductance and capacitance effects.
Proper termination of the differential data signals
will prevent reflections and ringing which would
compromise the signal fidelity and generate
unwanted electrical noise. Locate termination at
the received signal end of the transmission line.
The length of these lines should be kept short
and of equal length. 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 from flowing which will
cause distortion in the signal.
Maintain a solid, low inductance ground plane
for returning signal currents to the power supply.
Multilayer plane printed circuit board is best
for distribution of V
forming transmission lines and shielding, Also,
it is important to suppress noise from influencing
Figure 3. Recommended Circuit Schematic
3
TERMINATE
AT PHY
DEVICE
INPUTS
R6
NO INTERNAL
CONNECTION
V
Rx
EER
1
RD
R5
V
RD
CC
C6
2
RD
R7
RD
CC
3
R8
SD
, returning ground currents,
R10
SD
4
C1
TOP VIEW
C3
TRANSCEIVER
C7
AT V
V
V
R9
Rx
CCR
5
cc
L1 L2
FILTER
V
cc
CC
PINS
V
Tx
CCT
6
C2
C4
C8
TD
7
TD
NO INTERNAL
CONNECTION
TERMINATION
TRANSCEIVER
R1
TD
R2
8
INPUTS
V
CC
C5
AT
V
R3
Tx
9
EET
R4
TD
the fiber-optic transceiver performance, especially
the receiver circuit. Proper power supply filtering
of V
using the recommended, separate filter circuits
shown in Figure 3 for the transmitter and
receiver sections. These filter circuits suppress
V
prevents receiver sensitivity degradation due to
V
components be used. Use tantalum capacitors
for the 10 µF capacitors and monolithic, ceramic
bypass capacitors for the 0.1 µF capacitors.
Also, it is recommended that a surface- mount
coil inductor of 3.3 µH be used. Ferrite beads
can be used to replace the coil inductors when
using quieter V
is recommended over a ferrite bead. All power
supply components need to be placed physically
next to the V
transmitter. 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.
In addition to these recommendations, Avago
Technologies Application Engineering staff is
available for consulting on best layout practices
with various vendors mux/demux, clock generator
and clock recovery circuits. Avago Technologies
has participated in several reference design
studies and is prepared to share the findings of
these studies with interested customers. Contact
your local Avago Technologies sales representative
to arrange for this service.
CC
CC
noise. It is recommended that surface-mount
CC
noise over a broad frequency range, this
NOTES:
THE SPLIT-LOAD TERMINATIONS FOR PECL SIGNALS
NEED TO BE LOCATED AT THE INPUT OF DEVICES
RECEIVING THOSE PECL SIGNALS.
RECOMMEND 4-LAYER PRINTED CIRCUIT BOARD WITH
50Ω MICROSTRIP SIGNAL PATHS BE USED.
R1 = R4 = R6 = R8 = R10 = 130 Ω FOR +5.0V OPERATION,
82 Ω FOR +3.3V OPERATION.
R2 = R3 = R5 = R7 = R9 = 82 Ω FOR +5.0V OPERATION,
130 Ω FOR +3.3V OPERATION.
C1 = C2 = 10 µF
C3 = C4 = C7 = C8 = 100 nF
C5 = C6 = 0.1 µF
L1 = L2 = 3.3 µH COIL OR FERRITE INDUCTOR.
for this transceiver is accomplished by
CC
CC
supplies, but a coil inductor
pins of the receiver and