AFCT-5971ALZ Avago Technologies US Inc., AFCT-5971ALZ Datasheet - Page 8

• Manufacturer Part Number: AFCT-5971ALZ
• Description: TXRX FE SM LASER 125MBS 2X5
• Manufacturer: Avago Technologies US Inc.

Specifications of AFCT-5971ALZ

• Applications: Ethernet
• Data Rate: 125MBd
• Wavelength: 1300nm
• Voltage - Supply: 3.1 V ~ 3.5 V
• Connector Type: LC Duplex
• Mounting Type: Through Hole
• Data Rate Max: 0.125Gbps
• Supply Voltage: 3.3V
• Wavelength Typ: 1300nm
• Leaded Process Compatible: Yes
• Optical Fiber Type: TX/RX
• Data Transfer Rate: 155Mbps
• Optical Rise Time: 2/2.2ns
• Optical Fall Time: 2/2.2ns
• Operating Temperature Classification: Industrial
• Peak Wavelength: 1360/1580nm
• Package Type: DIP With Connector
• Operating Supply Voltage (min): 3.1V
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (max): 3.5V
• Output Current: 50mA
• Operating Temp Range: -40C to 85C
• Mounting: Snap Fit To Panel
• Pin Count: 10
• Product: Transceiver
• Maximum Rise Time: 2 ns, 2.2 ns
• Maximum Fall Time: 2 ns, 2.2 ns
• Maximum Output Current: 50 mA
• Operating Supply Voltage: 3.1 V to 3.5 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Package / Case: DIP-10 with Connector
• Function: Applications specified for signal rate of 125 MBd, for Fast Ethernet, and Singlemode Fiber.
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: Singlemode Glass
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

T
Figure 6b. Recommended ac Coupled Interface Circuit
The AFCT-5971LZ/ALZ 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 preamplifier and the postamplifier stages.
The actual Data and Data-bar outputs of the postampli-
fier are dc-coupled to their respective output pins (pins
4, 5). The two data outputs of the receiver should be
terminated 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 a and b show the power supply circuit
which complies with the small form factor multisource
agreement. It is further recommended that a continu-
8
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.
DIS
T
R
X
X
(LVTTL)
10
1
9
2
8
3
7
4
82 W
130 W
130 W
V
6
CC
5
(+3.3 V)
82 W
130 W
130 W
C2
C1
100 nF
1 µH
1 µH
100 nF
100 nF
100 nF
100 nF
C5 *
10 µF
C4 *
10 µF
ous ground plane be provided in the circuit board di-
rectly 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 defined in the current multisource agreement
which defined 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 transmit-ter must ei-
ther maintain eye-safe operation or be disabled.
Z = 50 W
Z = 50 W
Z = 50 W
Z = 50 W
Z = 50 W
V
CC
C3
(+3.3 V)
100 nF
100 nF
10 µF
130 W
82 W
130 W
V
130 W
CC
82 W
(+3.3 V)
V
CC
82 W
130 W
(+3.3 V)
RD+
TD-
TD+
RD-
SD
130
W
LVPECL
V
CC
V
(+3.3 V)
CC
(+3.3 V)
NOTE A
NOTE B