HFCT-5961TG Avago Technologies US Inc., HFCT-5961TG Datasheet - Page 7

• Manufacturer Part Number: HFCT-5961TG
• Manufacturer: Avago Technologies US Inc.

Specifications of HFCT-5961TG

• Optical Fiber Type: TX/RX
• Data Transfer Rate: 155Mbps
• Optical Rise Time: 2ns
• Optical Fall Time: 2ns
• Operating Temperature Classification: Commercial
• Peak Wavelength: 1360nm
• 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: 0C to 70C
• Mounting: Snap Fit To Panel
• Pin Count: 10
• Lead Free Status / RoHS Status: Compliant

Application Information
The Applications Engineering Group at Avago Tech-
nologies is available to assist you with technical under-
standing and design trade-offs 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
fiber-optic link is determined by the difference 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 es-
tablish a working fiber-optic link. The OPB is allocated
for the fiber-optic cable length and the corresponding
link penalties. For proper link performance, all penalties
that affect the link performance must be accounted for
within the link optical power budget.
Figure 6a. Recommended dc Coupled Interface Circuit
T
7
Note: C1 = C2 = C3 = 10 nF or 100 nF
* 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
TRANSCEIVER INPUTS
7
TERMINATE AT
4
130 W
6
5
100 W
130 W
C1
C2
1 µH
1 µH
C5 *
10 µF
C4 *
10 µF
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’ HFCT-5961TL/TG/NL/NG/ATL/ATG
fiber-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, continuous 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.
Z = 50 W
Z = 50 W
Z = 50 W
Z = 50 W
Z = 50 W
V
CC
C3
(+3.3 V)
10 µF
130 W
100 W
DEVICE INPUTS
TERMINATE AT
130 W
82 W
V
CC
130 W
(+3.3 V)
TD-
TD+
RD+
RD-
SD
PHY DEVICE
V
CC
V
LVPECL
LVPECL
CC
(+3.3 V)
(+3.3 V)