HP XMT5170A-155-ST, XMT5170A-155-SC, XMT5170A-155-FP, XMT5170B-155-ST, XMT5170B-155-SC Datasheet
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155 Mb/s Logic Interface Laser
Transmitter for OC3/STM1
Preliminary Technical Data
XMT5170-155
Features
• SONET/SDH Compliant to
STM1 L-1.1
OC3 LR-1
• –40°C to +85°C Operation
• Compact 20 Pin Package
• ECL/PECL Logic Interface
• Multisourced Pinout
• Fully Interchangeable High
and Low Power Versions
Applications
• SONET/SDH Systems
• Single Mode ATM
• Fiber to the Home
• Data Communications
Networks
Description
The XMT5170-155 is a high
performance uncooled optical
laser transmitter for CCITT SDH
and ANSI SONET applications. It
is designed with an ECL/PECL
logic interface for 155 MBd
transmission.
The transmitter incorporates
several features which simplify
system design. It may be
operated with either +5 V or –5 V
power supplies. Standard 10 KH
ECL data interface enables direct
interface with PECL or ECL logic.
The compact transmitter module
contains a pigtailed laser, data
interface, bias and modulation
control circuitry. Thus, no
external components or adjustments are necessary. Finally, a
laser disable input is provided to
shut down the laser for standby
or test purposes.
The XMT5170-155 has -2 dBm
mean output power for long haul
systems.
The XMT5170-155 includes
analog outputs which are
proportional to laser current and
optical power. These may be used
with external circuitry to detect
end-of-life, or over temperature
conditions.
The transmitter is packaged in a
20 pin 0.4" pitch DIP. An
evaluation board is available for
this product. Contact your local
representative for more details.
Preliminary Product Disclaimer
This preliminary data sheet is provided to assist you in the evaluation of engineering samples of the product which is under development
and targeted for release during 1997. Until Hewlett-Packard releases this product for general sales, HP reserves the right to alter prices,
specifications, features, capabilities, function, manufacturing release dates, and even general availability of the product at any time.
424
(5/97)
Connection Diagram
Top View
FIBER PIGTAIL
LASER BIAS MONITOR (+)
LASER BIAS MONITOR (–)
V
V
TRANSMIT DISABLE
V
V
Pin Descriptions
Pins 1, 3, 10, 20, NC:
These pins should not be connected 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, VEE:
These pins are connected to
ground in +5 V systems and –5 V
in negative supply systems.
NC
NC
EE
CC
CC
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
LASER BACK FACET MONITOR (–)
DATA
DATA
V
CASE GROUND (SEE NOTE BELOW)
V
CASE GROUND (SEE NOTE BELOW)
Pins 6, 8, 9, 12, 18, VCC:
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 VEE when open
circuited, enabling the
transmitter. It must be biased
within 3 V of VCC to disable.
Pins 11,13, Ground:
The XMT5170-155 case is plastic,
therefore pins are not connected.
CC
EE
CC
Pins 15, 16, DATA, DATA:
These are differential ECL inputs.
If open circuited they float to V
BB
(VCC –1.3 V).
Pin 17, Laser Back Facet
Monitor (–):
See Figure 2.
Pin 19, Laser Back Facet
Monitor (+):
See Figure 2.
V
CC
200 Ω
TO LASER BIAS
CONTROL CIRCUITRY
PIN 2
PIN 4
3 kΩ
3 kΩ
V
CC
LASER
10 Ω
I
BIAS
V
EE
MODULATION
CURRENT
PIN 19
PIN 17
MONITOR
PHOTODIODE
3 kΩ
3 kΩ
Figure 1. Laser Bias Monitor Circuitry. Figure 2. Back Facet Monitor Circuitry.
425
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