Connection Diagram
RX
TX
Mounting Studs/
Solder Posts
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
PHOTO DETECTOR BIAS
RECEIVER SIGNAL GROUND
RECEIVER SIGNAL GROUND
NOT CONNECTED
1
2
20
Top 19
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
43 View18
5
6
7
8
17
NOT CONNECTED
16
15
14
13
12
11
RECEIVER SIGNAL GROUND
RECEIVER POWER SUPPLY
SIGNAL DETECT
RECEIVER DATA OUTPUT BAR
RECEIVER DATA OUTPUT
9
10
TRANSMITTER POWER SUPPLY
Figure 5. Pin Out Diagram (Top View)
Pin Descriptions:
Pin 1 Photo Detector Bias, VpdR:
Pins 12, 16 Transmitter Signal Ground VEE TX:
This pin enables monitoring of photo detector bias cur-
rent. The pin should either be connected directly to VC-
RX, or to VCCRX through a resistor for monitoring photo
dC etector bias current.
Directly connect these pins to the transmitter signal
ground plane.
Pin 13 Transmitter Disable TDIS
:
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”.
Pins 2, 3, 6 Receiver Signal Ground VEE RX:
Directly connect these pins to the receiver ground plane.
Pins 4, 5 DO NOT CONNECT
Pin 14 Transmitter Data In TD+:
PECL logic family. Internal terminations are provided (Ter-
minations, ac coupling).
Pin 7 Receiver Power Supply VCC RX:
Provide +3.3 V dc via the recommended receiver power
supply filter circuit. Locate the power supply filter cir-
cuit as close as possible to the VCC RX pin. Note: the filter
circuit should not cause VCC to drop below minimum
specification.
Pin 15 Transmitter Data In Bar TD-:
Internal terminations are provided (Terminations, ac cou-
pling).
Pin 17 Laser Diode Bias Current Monitor - Negative End BMON
The laser diode bias current is accessible by measuring
the differential voltage developed across pins 17 and 18.
–
Pin 8 Signal Detect SD:
Normal optical input levels to the receiver result in a
logic “1”output.
Pin 18 Laser Diode Bias Current Monitor - Positive End BMON
See pin 17 description.
+
Low optical input levels to the receiver result in a logic
“0”output.
This Signal Detect output can be used to drive a TTL in-
put on an upstream circuit, such as Signal Detect input or
Loss of Signal-bar.
Pin 19 Laser Diode Optical Power Monitor - Negative End PMON
–
The back facet diode monitor current is accessible by mea-
suring the differential voltage developed across pins 19
and 20.
Pin 9 Receiver Data Out Bar RD-:
PECL logic family. Output internally biased and ac cou-
pled.
Pin 20 Laser Diode Optical Power Monitor - Positive End PMON
See pin 19 description.
+
Pin 10 Receiver Data Out RD+:
PECL logic family. Output internally biased and ac cou-
pled.
Mounting Studs/Solder Posts
The two mounting studs are provided for transceiver
mechanical attachment to the circuit board. It is recom-
mended that the holes in the circuit board be connected
to chassis ground.
Pin 11 Transmitter Power Supply VCC TX:
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 VCC TX pin.
6
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