Connection Diagram
Top View
FIBER PIGTAIL
NC
LASER BIAS MONITOR (+)
NC
LASER BIAS MONITOR (–)
V
EE
V
CC
TRANSMIT DISABLE
V
CC
V
CC
NC
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
NC
LASER BACK FACET MONITOR (+)
V
CC
LASER BACK FACET MONITOR (–)
DATA
DATA
V
EE
CASE GROUND (SEE NOTE BELOW)
V
CC
CASE GROUND (SEE NOTE BELOW)
Pin Descriptions
Pins 1, 3, 10, 20, NC:
These pins should not be con-
nected and should be left open
circuit on the application PCB.
Pin 2, Laser Bias Monitor (+):
See Figure 1.
Pin 4, Laser Bias Monitor (–):
See Figure 1.
Pins 5, 14, V
EE
:
These pins are connected to
ground in +5 V systems and –5 V
in negative supply systems.
Pins 6, 8, 9, 12, 18, V
CC
:
These pins are connected to +5 V
for positive supply systems and
ground for –5.2 V systems.
Pin 7, Transmit Disable:
Pin 7 floats to V
EE
when open
circuited, enabling the
transmitter. It must be biased
within 3 V of V
CC
to disable.
Pins 11, 13, Ground:
The XMT5370-155 case is plastic,
therefore pins are not connected.
Pins 15, 16, DATA, DATA:
These are differential ECL inputs.
If open circuited they float to V
BB
(V
CC
–1.3 V).
Pin 17, Laser Back Facet
Monitor (–):
See Figure 2.
Pin 19, Laser Back Facet
Monitor (+):
See Figure 2.
V
CC
LASER
3 kΩ
PIN 2
10
Ω
3 kΩ
PIN 4
I
BIAS
V
EE
PIN 17
PIN 19
MONITOR
PHOTODIODE
3 kΩ
V
CC
MODULATION
CURRENT
3 kΩ
200
Ω
TO LASER BIAS
CONTROL CIRCUITRY
Figure 1. Laser Bias Monitor Circuitry.
Figure 2. Back Facet Monitor Circuitry.
437
AGILENT [ AGILENT TECHNOLOGIES, LTD. ]
