HFCT-5942 HP [Agilent(Hewlett-Packard)], HFCT-5942 Datasheet - Page 6

• Manufacturer Part Number: HFCT-5942
• Description: Single Mode Laser Small Form Factor Transceivers for ATM, SONET OC-48/SDH STM-16 Part of the Agilent METRAK family
• Manufacturer: HP [Agilent(Hewlett-Packard)]

Connection Diagram
Pin Descriptions:
Pin 1 Photo Detector Bias, VpdR:
This pin enables monitoring of
photo detector bias current. The
pin should either be connected
directly to V
through a resistor for monitoring
photo detector bias current.
Pins 2, 3, 6 Receiver Signal Ground V
RX:
Directly connect these pins to
the receiver ground plane.
Pins 4, 5 DO NOT CONNECT
Pin 7 Receiver Power Supply V
Provide +3.3 V dc via the
recommended receiver power
supply filter circuit. Locate the
power supply filter circuit as
close as possible to the V
pin. Note: the filter circuit
should not cause V
below minimum specification.
Pin 8 Signal Detect SD:
Normal optical input levels to
the receiver result in a logic “1”
output.
Low optical input levels to the
receiver result in a logic “0”
output.
This Signal Detect output can be
used to drive a TTL input on an
upstream circuit, such as Signal
Detect input or Loss of Signal-
bar.
Figure 5. Pin Out Diagram (Top View)
6
CC
RX, or to V
CC
to drop
RECEIVER DATA OUTPUT BAR
CC
CC
CC
RECEIVER SIGNAL GROUND
RECEIVER SIGNAL GROUND
RECEIVER SIGNAL GROUND
RECEIVER POWER SUPPLY
RX:
RECEIVER DATA OUTPUT
RX
RX
PHOTO DETECTOR BIAS
EE
Grounding Tabs
NOT CONNECTED
NOT CONNECTED
SIGNAL DETECT
Package
Pin 9 Receiver Data Out Bar RD-:
PECL logic family. Output
internally biased and ac coupled.
Pin 10 Receiver Data Out RD+:
PECL logic family. Output
internally biased and ac coupled.
Pin 11 Transmitter Power Supply
V
Provide +3.3 V dc via the
recommended transmitter power
supply filter circuit. Locate the
power supply filter circuit as
close as possible to the V
pin.
Pins 12, 16 Transmitter Signal
Ground V
Directly connect these pins to
the transmitter signal ground
plane.
Pin 13 Transmitter Disable T
Optional feature, connect this
pin to +3.3 V TTL logic high “1”
to disable module. To enable
module connect to TTL logic low
“0”.
Pin 14 Transmitter Data In TD+:
PECL logic family.
Internal terminations are
provided (Terminations, ac
coupling).
Pin 15 Transmitter Data In Bar TD-:
Internal terminations are
provided (Terminations, ac
coupling).
CC
TX:
EE
TX:
o
o
o
o
o
o
o
o
o
o
RX
10
1
2
3
4
5
6
7
8
9
View
Top
TX
20
19
18
17
16
15
14
13
12
11
o
o
o
o
o
o
o
o
o
o
DIS
LASER DIODE OPTICAL POWER MONITOR - POSITIVE END
LASER DIODE OPTICAL POWER MONITOR - NEGATIVE END
LASER DIODE BIAS CURRENT MONITOR - POSITIVE END
LASER DIODE BIAS CURRENT MONITOR - NEGATIVE END
TRANSMITTER SIGNAL GROUND
TRANSMITTER DATA IN BAR
TRANSMITTER DATA IN
TRANSMITTER DISABLE
TRANSMITTER SIGNAL GROUND
TRANSMITTER POWER SUPPLY
CC
:
Mounting Studs/
Solder Posts
TX
Pin 17 Laser Diode Bias Current Monitor
- Negative End B
The laser diode bias current is
accessible by measuring the
voltage developed across pins 17
and 18. Dividing the voltage by
10 Ohms (internal) will yield the
value of the laser bias current.
Pin 18 Laser Diode Bias Current Monitor
- Positive End B
See pin 17 description.
Pin 19 Laser Diode Optical Power
Monitor - Negative End P
The back facet diode monitor
current is accessible by
measuring the voltage developed
across pins 19 and 20. The
voltage across a 200 Ohm
resistor between pins 19 and 20
will be proportional to the photo
current.
Pin 20 Laser Diode Optical Power
Monitor - Positive End P
See pin 19 description.
Mounting Studs/Solder Posts
The two mounting studs are
provided for transceiver
mechanical attachment to the
circuit board. It is
recommended that the holes in
the circuit board be connected to
chassis ground.
Package Grounding Tabs
Connect four package grounding
tabs to signal ground.
MON
MON
+
–
MON
MON
+
–