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AFCT-5961NLZ

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
7
Application Information
The Applications Engineering Group at Avago Tech-
nologies is available to assist you with technical under-
standing and design trade-os associated with these
transceivers. You can contact them through your Avago
Technologies sales representative.
The following information is provided to answer some
of the most common questions about the use of the
parts.
Optical Power Budget and
Link Penalties
The worst-case Optical Power Budget (OPB) in dB for a
ber-optic link is determined by the dierence between
the minimum transmitter output optical power (dBm
avg) and the lowest receiver sensitivity (dBm avg). This
OPB provides the necessary optical signal range to
establish a working ber-optic link. The OPB is allocated
for the ber-optic cable length and the corresponding
link penalties. For proper link performance, all penalties
that aect the link performance must be accounted for
within the link optical power budget.
o V
EE
RX
o V
CC
RX
o SD
o RD-
o RD+
Z = 50 Ω
Z = 50 Ω
Z = 50 Ω
Z = 50 Ω
SD
V
CC
(+3.3 V)
V
CC
(+3.3 V)
RD+
RD-
Z = 50 Ω
1
TD- o
TD+ o
T
DIS
o
V
EE
TX o
V
CC
TX o
1 µH
C2
1 µH
C1
C3
10 µF
T
X
R
X
130 Ω
130 Ω
130 Ω
130 Ω
TERMINATE AT
TRANSCEIVER INPUTS
100 Ω
T
DIS
(LVTTL)
2 3 4 5
10 9 8 7 6
TD-
TD+
LVPECL
V
CC
(+3.3 V)
100 Ω
C4 *
10 µF
82 Ω
C5 *
10 µF
LVPECL
130 Ω
V
CC
(+3.3 V)
TERMINATE AT
DEVICE INPUTS
PHY DEVICE
Note: C1 = C2 = C3 = 10 nF or 100 nF
* C4 AND C5 ARE OPTIONAL BYPASS CAPACITORS FOR ADDITIONAL
LOW FREQUENCY NOISE FILTERING.
Figure 6a. Recommended dc Coupled Interface Circuit
Electrical and Mechanical Interface
Recommended Circuit
Figures 6a and 6b show recommended dc and ac
coupled circuits for deploying the Avago Technologies
transceivers in +3.3 V systems.
Data Line Interconnections
Avago Technologies AFCT-5961TLZ/TGZ/ATLZ/ATGZ/
NLZ/NGZ ber-optic transceivers are designed to couple
to +3.3 V PECL signals. The transmitter driver circuit
regulates the output optical power. The regulated light
output will maintain a constant output optical power
provided the data pattern is reasonably balanced in
duty cycle. If the data duty cycle has long, continu-
ous state times (low or high data duty cycle), then the
output optical power will gradually change its average
output optical power level to its preset value.
8
Figure 6b. Recommended ac Coupled Interface Circuit
The AFCT-5961TLZ/TGZ/ATLZ/ATGZ/NLZ/NGZ have a
transmit disable function which is a single-ended +3.3 V
TTL input which is dc-coupled to pin 8.
As for the receiver section, it is internally ac-coupled
between the preamplier and the postamplier stages.
The actual Data and Data-bar outputs of the postampli-
er are dc-coupled to their respective output pins (pins
4, 5). The two data outputs of the receiver should be ter-
minated with identical load circuits.
Signal Detect is a single-ended, +3.3 V PECL compatible
output signal that is dc-coupled to pin 3 of the module.
Signal Detect should not be ac-coupled externally to
the follow-on circuits because of its infrequent state
changes.
Power Supply Filtering and Ground Planes
It is important to exercise care in circuit board layout to
achieve optimum performance from these transceiv-
ers. Figures 6a and 6b show the power supply circuit
which complies with the small form factor multisource
agreement. It is further recommended that a continuous
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.
Package footprint and front panel considerations
The Avago Technologies transceivers comply with the
circuit board “Common Transceiver Footprint” hole
pattern dened in the current multisource agreement
which dened the 2 x 5 package style. This drawing
is reproduced in Figure 7 with the addition of ANSI
Y14.5M compliant dimensioning to be used as a guide
in the mechanical layout of your circuit board. Figure 8
shows the front panel dimensions associated with such
a layout.
Eye Safety Circuit
For an optical transmitter device to be eye-safe in the
event of a single fault failure, the transmitter must either
maintain eye-safe operation or be disabled.
The AFCT-5961TLZ/TGZ/ATLZ/ATGZ/NLZ/NGZ is intrinsi-
cally eye safe and does not require shut down circuitry.
o
V
EE
R
X
o
V
CC
R
X
o
SD
o
RD-
o
RD+
Z = 50 W
Z = 50 W
Z = 50 W
Z = 50 W
SD
LVPECL
V
CC
(+3.3 V)
V
CC
(+3.3 V)
RD+
RD-
V
CC
(+3.3 V)
130 W
Z = 50 W
1
TD-
o
TD+
o
T
DIS
o
V
EE
T
X
o
V
CC
T
X
o
1 µH
C2
1 µH
C1
C3
10 µF
T
X
R
X
130 W
130 W
130 W
130 W
100 nF
100 nF
100 nF
100 nF
82 W
130 W
V
CC
(+3.3 V)
130 W
82 W
T
DIS
(LVTTL)
2 3 4 5
10 9 8 7 6
TD-
TD+
Note: C1 = C2 = C3 = 10 nF or 100 nF
Note A: CIRCUIT ASSUMES OPEN EMITTER OUTPUT
Note B: WHEN INTERNAL BIAS IS PROVIDED REPLACE SPLIT RESISTORS WITH 100 W TERMINATION
* C4 AND C5 ARE OPTIONAL BYPASS CAPACITORS FOR ADDITIONAL LOW FREQUENCY NOISE FILTERING.
NOTE A
NOTE B
V
CC
(+3.3 V)
100 nF
100 nF
82 W
130 W
V
CC
(+3.3 V)
82 W
130
W
C4 *
10 µF
82 W
100 nF
C5 *
10 µF
9
Signal Detect
The Signal Detect circuit provides a de-asserted output
signal when the optical link is broken (or when the
remote transmitter is OFF). The Signal Detect threshold
is set to transition from a high to low state between the
minimum receiver input optical power and -45 dBm
avg. input optical power indicating a denite optical
fault (e.g. unplugged connector for the receiver or
transmitter, broken ber, or failed far-end transmitter or
data source). The Signal Detect does not detect receiver
data error or error-rate. Data errors can be determined
by signal processing oered by upstream PHY ICs.
Electromagnetic Interference (EMI)
One of a circuit board designer’s foremost concerns is
the control of electromagnetic emissions from electron-
ic equipment. Success in controlling generated Elec-
tromagnetic Interference (EMI) enables the designer to
pass a governmental agency’s EMI regulatory standard
and more importantly, it reduces the possibility of in-
terference to neighboring equipment. Avago Technolo-
gies has designed the AFCT-5961TLZ/TGZ/ATLZ/ATGZ/
NLZ/NGZ to provide excellent EMI performance. The
EMI performance of a chassis is dependent on physical
design and features which help improve EMI suppres-
sion. Avago Technologies encourages using standard RF
suppression practices and avoiding poorly EMI-sealed
enclosures.
Avago Technologies’ OC-3 LC transceivers (AFCT-
5961TLZ/TGZ/ATLZ/ATGZ/NLZ/NGZ) have nose shields
which provide a convenient chassis connection to
the nose of the transceiver. This nose shield improves
system EMI performance by eectively closing o the
LC aperture. The recommended transceiver position,
PCB layout and panel opening for these devices are the
same, making them mechanically drop-in compatible.
Figure 8 shows the recommended positioning of the
transceivers with respect to the PCB and faceplate.
Recommended Solder and Wash Process
The AFCT-5961TLZ/TGZ/ATLZ/ATGZ/NLZ/NGZ are com-
patible with industry-standard wave solder processes.
7.59
(0.299)
3
(0.118)
3
(0.118)
6
(0.236)
4.57
(0.18)
4 x 1.78
(0.07)
10 x Ø 0.81 ±0.1
(0.032 ±0.004)
3.08
(0.121)
2 x Ø 2.29
(0.09)
9.59
(0.378)
2
(0.079)
13.34
(0.525)
7.11
(0.28)
4 x Ø 1.4 ±0.1
(0.055 ±0.004)
2 x Ø 1.4 ±0.1
(0.055 ±0.004)
2 x Ø 1.4 ±0.1
(0.055 ±0.004)
10.16
(0.4)
3.56
(0.14)
2 x Ø 2.29 MAX.
(0.09)
17.8
(0.700)
2
(0.079)
*4
*5
DIMENSIONS IN MILLIMETERS (INCHES)
Figure 7. Recommended Board Layout Hole Pattern
NOTES:
1. THIS FIGURE DESCRIBES MSA RECOM-
MENDED CIRCUIT BOARD LAYOUT FOR
THE SFF TRANSCEIVER.
2. THE HATCHED AREAS ARE KEEP-OUT
AREAS RESERVED FOR HOUSING
STANDOFFS. NO METAL TRACES OR
GROUND CONNECTION IN KEEP-OUT
AREAS.
3. 2 x 5 TRANSCEIVER MODULE REQUIRES 16
PCB HOLES (10 I/O PINS, 2 SOLDER POSTS
AND 4 OPTIONAL PACKAGE GROUNDING
TABS). PACKAGE GROUNDING TABS
SHOULD BE CONNECTED TO SIGNAL
GROUND.
*4. THE MOUNTING STUDS SHOULD BE
SOLDERED TO CHASSIS GROUND FOR
MECHANICAL INTEGRITY AND TO ENSURE
FOOTPRINT COMPATIBILITY WITH OTHER
SFF TRANSCEIVERS.
*5. HOLES FOR OPTIONAL HOUSING LEADS
MUST BE TIED TO SIGNAL GROUND.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

AFCT-5961NLZ

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Fiber Optic Transmitters, Receivers, Transceivers Transceive
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