11
Long Wavelength GBIC: HFCT-5612
Transmitter Section
The transmitter section consists
of a 1300 nm MQW Fabry Perot
Laser in an optical subassembly
(OSA), which mates to the fiber
optic cable. The Laser OSA is
driven by a custom, silicon bipolar
IC which converts differential
PECL logic signals (ECL
referenced to a +5 V supply) into
an analog drive current to the
laser.
The laser driver IC incorporates
temperature compensation and
feedback from the OSA to
maintain constant output power
and extinction ratio over the
operating temperature range.
Receiver Section
The receiver includes a PIN
photodiode mounted together
with a custom, silicon bipolar
transimpedance preamplifier IC,
in an OSA. The OSA interfaces to
a custom silicon bipolar circuit
that provides post-amplification
and quantization. The post-
amplifier includes a Signal Detect
circuit that provides TTL
compatible logic-low output in
response to the detection of a
usable input optical signal.
Eye Safety Design
The laser driver is designed to be
Class 1 eye safe (CDRH21 CFR(J),
IEC 60825-1) under a single fault
condition.
There are three key elements to
the safety circuitry: a monitor
diode, a window detector circuit,
and direct control of the laser
bias. The window detection
circuit monitors the average
optical power using the photo
diode in the laser OSA. If a fault
occurs such that the dc bias
circuit cannot maintain the preset
conditions within ±20%,
TX_FAULT (Pin 10) will be
asserted (high).
Note: Under any single fault, the
laser optical output power will
remain within Class 1 eye safe
limits.
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause catastrophic damage to the device. Limits apply to each parameter
in isolation, all other parameters having values within the recommended operating conditions. It should not be assumed that
limiting values of more than one parameter can be applied to the product at the same time. Exposure to the absolute maximum
ratings for extended periods can adversely affect device reliability.
Recommended Operating Conditions
Transceiver Electrical Characteristics
(T
A
= 0°C to +70°C, V
CC
= 4.75 V to 5.25 V)
Notes:
1. See Figure 1 for measurement point.
2. Maximum current is specified at V
CC
= maximum @ maximum operating temperature and end of life.
3. Hot plug above actual steady state current.
4. Total T
X
+ R
X
.
Parameter Symbol Min. Typ. Max. Unit Notes
Storage Temperature T
S
-40 +85 °C
Supply Voltage V
DD
T
V
DD
R
-0.5 6.0 V
Data Input Voltage TX_DAT -0.5 V
DD
TV
Transmitter
Differential Input Voltage
±TX_DAT 2000 mV p-p
Relative Humidity RH 5 95 %
Parameter Symbol Min. Typ. Max. Unit Notes
Ambient Operating Temperature T
A
0+60°C
Case Temperature T
CASE
+75 °C1
Supply Voltage V
DD
T
V
DD
R
4.75 5.0 5.25 V
Supply Current I
TX
+ I
RX
200 300 mA 2
Parameter Symbol Min. Typ. Max. Unit Notes
Surge Current I
SURGE
+30 mA 3
Power Dissipation P
DISS
1.00 1.58 W 4
(20 paginas)
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