Microchip SY88952L Bedienungsanleitung

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SY88952L Evaluation BoardMicrel

M9999-061704

[email protected] 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

■50Ω 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.: AAmendment: /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 differential 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 specifications 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 50Ω 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.

LayerDefinition

1Signal/GND

2GND

3VEE

4GND

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

Produktspezifikationen