8
Short Wavelength GBIC: HFBR-5602
Transmitter Section
The transmitter section consists
of an 850 nm VCSEL in an optical
subassembly (OSA), which mates
to the fiber cable. The VCSEL
OSA is driven by a custom, silicon
bipolar IC which converts
differential logic signals into an
analog Laser Diode drive current.
Receiver Section
The receiver includes a silicon
PIN photodiode mounted together
with a custom, silicon bipolar
transimpedance preamplifier IC,
in an OSA. This 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. To be eye safe, only
one of two results can occur in
the event of a single fault, the
transmitter must either maintain
normal eye safe operation or the
transmitter should be disabled.
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 monitor
diode. If a fault occurs such that
the dc regulation circuit cannot
maintain the preset bias
conditions within ±20%, the
transmitter will automatically be
disabled. Once this has occurred,
an electrical power reset will
allow an attempted turn-on of the
transmitter. TX_FAULT can also
be cleared by cycling TX_DISABLE
high for a time interval >10 µs.
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 +60°C, V
CC
= 4.75 V to 5.25 V)
Notes:
1. Up to applied V
DD
T.
2. See Figure 1 for measurement point.
3. Maximum current is specified at V
CC
= maximum @ maximum operating temperature and end of life.
4. Hot plug above actual steady state current.
5. 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 1
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 °C2
Supply Voltage V
DD
T
V
DD
R
4.75 5.0 5.25 V
Supply Current I
TX
+ I
RX
200 300 mA 3
Parameter Symbol Min. Typ. Max. Unit Notes
Surge Current I
SURGE
+30 mA 4
Power Dissipation P
DISS
1.00 1.58 W 5
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