hfct-5612 Avago Technologies, hfct-5612 Datasheet - Page 11

• Manufacturer Part Number: hfct-5612
• Description: Gigabit Interface Converters Gbic For Fibre Channel
• Manufacturer: Avago Technologies

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 compensa-
tion 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 transimped-
ance preamplifier IC, in an OSA. The OSA interfaces to a
custom silicon bipolar circuit that provides post-ampli-
fication and quantization. The post-amplifier includes a
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
Notes:
1. See Figure 1 for measurement point.
2. Maximum current is specified at V
3. Hot plug above actual steady state current.
4. Total T
11
Parameter
Storage Temperature
Supply Voltage
Data Input Voltage
TransmitterDifferential Input Voltage ±TX_DAT
Relative Humidity
Parameter
Ambient Operating Temperature
Case Temperature
Supply Voltage
Supply Current
Parameter
Surge Current
Power Dissipation
A
= 0°C to +70°C, V
X
+ R
X
.
CC
= 4.75 V to 5.25 V)
CC
= maximum @ maximum operating temperature and end of life.
Symbol
T
V
TX_DAT
RH
Symbol
T
T
V
I
Symbol
I
P
TX
SURGE
A
S
CASE
DD
DISS
DD
+ I
TV
TV
RX
DD
DD
R
R
Min.
-40
-0.5
-0.5
5
Min.
0
4.75
Min.
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.
Typ.
Typ.
5.0
200
Typ.
1.00
Max.
+85
6.0
V
2000
95
Max.
+60
+75
5.25
300
Max.
+30
1.58
DD
T
Unit
°C
V
V
mV p-p
%
Unit
°C
°C
V
mA
Unit
mA
W
Notes
Notes
1
2
Notes
3
4