HFBR-0555 Avago Technologies US Inc., HFBR-0555 Datasheet - Page 7

• Manufacturer Part Number: HFBR-0555
• Description: Fiber Optics, Evaluation Kit
• Manufacturer: Avago Technologies US Inc.

Specifications of HFBR-0555

• Silicon Core Number: HFBR-5905/5905A
• Features: Test Fixture (Footprint Compatible W/ All Multi-Mode 155 Megabit ATM Small Form Factor Transceivers)
• Tool / Board Applications: Fiber Optic Transceivers
• Main Purpose: Interface, Fiber Optics
• Embedded: No
• Utilized Ic / Part: HFBR-5900 Family
• Primary Attributes: ATM Multimode Transceivers, 155Mbit
• Secondary Attributes: SONET OC-3/SDH STM-1
• Description/function: Fiber Optic Kit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: HFCT-5903E
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant

Board Layout - Decoupling Circuit, Ground Planes and
Termination Circuits
It is important to take care in the layout of your circuit
board to achieve optimum performance from these
transceivers. Figure 7 provides a good example of a
schematic for a power supply decoupling circuit that
works well with these parts. It is further recommended
that a contiguous ground plane be provided in the
circuit board directly under the transceiver to provide
a low inductance ground for signal return current. This
recommendation is in keeping with good high
frequency board layout practices. Figures 7 and 8 show
two recommended termination schemes.
Figure 7. Recommended Decoupling and Termination Circuits
7
Note: C1 = C2 = C3 = 10 nF or 100 nF
T
R
X
X
TRANSCEIVER INPUTS
10
1
TERMINATE AT
2
9
3
8
130 Ω
4
7
100 Ω
5
6
130 Ω
C2
C1
1 µH
1 µH
Z = 50 Ω
Z = 50 Ω
V
C3
CC
Z = 50 Ω
Z = 50 Ω
Z = 50 Ω
(+3.3 V)
10 µF
Board Layout - Hole Pattern
The Avago Technologies transceiver complies with the
circuit board “Common Transceiver Footprint” hole
pattern defined in the original multisource announce-
ment which defined the 2 x 5 package style. This
drawing is reproduced in Figure 9 with the addition of
ANSI Y14.5M compliant dimensioning to be used as a
guide in the mechanical layout of your circuit board.
Board Layout - Art Work
The Applications Engineering group has developed a
Gerber file artwork for a multilayer printed circuit board
layout incorporating the recommendations above.
Contact your local Avago Technologies sales
representative for details.
130 Ω
130 Ω
V
DEVICE INPUTS
TERMINATE AT
82 Ω
CC
130 Ω
100 Ω
(+3.3 V)
TD-
TD+
RD+
RD-
SD
V
PHY DEVICE
CC
(+3.3 V)
LVPECL
LVPECL
V
CC
(+3.3 V)