Microchip SY88952L Manual


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M9999-061704
hbwhelp@micrel.com or (408) 955-1690
DESCRIPTION
The SY88952L features:
Multirate up to 2.7Gbps operation
Rise/fall times <75ps
Independently programmable laser modulation and
bias currents
Bias current to 100mA and modulation current to 90mA
Automatic average laser power control
Bias and modulation current monitors
Complies with ANSI, ITU, and Bellcore SDH/SONET
specifications
3.3V power supply; wide temperature operating range
The SY88952L evaluation board features:
DC-coupled inputs and outputs with SMA connectors
50 input network termination
Potentiometers to adjust modulation and bias currents
MD emulator to test APC functionality
FUNCTIONAL FEATURES
3.3V, 2.7Gbps SDH/SONET
LASER DRIVER WITH
AUTOMATIC POWER CONTROL
SY88952L
EVALUATION BOARD
Rev.: A Amendment: /0
Issue Date: June 2004
The SY88952L is a highly integrated and programmable
laser driver for SONET/SDH applications up to 2.7Gbps.
The device accepts dierential PECL data and clock inputs.
It provides programmable bias and modulation currents for
driving a laser. The modulation output of the SY88952L can
be DC-coupled to drive the laser diode, providing significant
power savings over AC-coupled operation.
An automatic power controller (APC) is integrated into
the SY88952L to maintain a constant average optical output
power over temperature and lifetime. The moduation current
can be externally temperature compensated to minimize
the variation of the extinction ration of the optical output.
This manual provides information on the SY88952L
evaluation board. It should be used in conjunction with the
SY88952L data sheet, which contains full specications of
the SY88952L.
The SY88952L evaluation board enables fast and
thorough evaluation of the SY88952L 2.7Gbps SDH/SONET
laser driver with automatic power control. The board is an
easy-to-use, 4-layer high-speed coplanar design that uses
Rogers 4003 dielectric material to achieve high bandwidth.
The layer stack is shown in Table 1.
The SY88952L evaluation board is designed to be driven
by a high-speed 2.7Gbps pattern generator and is intended
to be terminated to a 50 scope. This allows the user to
evaluate various parameters of the SY88952L, as listed in
the "Available Measurements" section of this document.
All data sheets and support documentation can be found
on Micrel’s web site at www.micrel.com.
Layer Definition
1 Signal/GND
2 GND
3 VEE
4 GND
Table 1. SY88952L Evaluation
Board Layer Stack-Up
AVAILABLE MEASUREMENTS
The SY88952L evaluation board allows the following
measurements:
Frequency performance
Output eye pattern generation
Mask testing
Jitter
Output rise/fall time
BER testing
APC functionality
EVALUATION BOARD
Figure 1. SY88952L Evaluation Board


Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: SY88952L

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