Microchip SY88813V Handleiding

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M9999-040504

hbwhelp@micrel.com or (408) 955-1690

DESCRIPTION

The SY88813V features:

■Single 3.3V or 5V power supply

■Up to 155Mbps operation

■Low noise PECL data outputs

■Chatter-free PECL Signal Detect (SD) output

■TTL /EN input

■Programmable SD level set (SDLVL)

■Available in a tiny 10-pin MSOP (3mm××××

×3mm)

package

The SY88813V evaluation board features:

■AC-coupled I/O with SMA connectors

■Single potentiometer to set SDLVL

■50Ω input network termination

FUNCTIONAL FEATURES

3.3V/5V 155Mbps PECL LOW-POWER

LIMITING POST AMPLIFIER

W/PECL SIGNAL DETECT

SY88813V

EVALUATION BOARD

AVAILABLE MEASUREMENTS

The SY88813V evaluation board allows the following

measurements:

■Frequency performance

■Output eye pattern generation

■Mask testing

■Jitter

■Output rise/fall time

■BER testing

■Hysteresis measurement

Rev.: AAmendment: /0

Issue Date:April 2004

The SY88813V low-power limiting post amplifier is

designed for use in fiber-optic receivers. The device connects

to typical transimpedance amplifiers (TIAs). The linear signal

output from TIAs can contain signicant amounts of noise

and may vary in amplitude over time. The SY88813V

quantizes these signals and outputs PECL level waveforms.

The SY88813V operates from a single +3.3V10% or±

+5V ±10% power supply, over temperatures ranging from

–40°C to +85°C. With its wide bandwidth and high gain,

signals with data rates up to 155Mbps and as small as

5mVpp can be amplified to drive devices with PECL inputs.

The SY88813V generates a PECL signal-detect output.

A programmable signal-detect level set pin (SDLVL) sets

the sensitivity of the input amplitude detection. SD asserts

high if the input amplitude rises above the threshold set by

SDLVLand deasserts low otherwise. /EN deasserts the true

output signal without removing the input signal. Typically

4.6dB SD hysteresis is provided to prevent chattering.

This manual provides information on the SY88813V

evaluation board. It should be used in conjunction with the

SY88813V datasheet, which contains full specications of

the SY88813V.

The SY88813V evaluation board enables fast and

thorough evaluation of the SY88813V 155Mbps PECL low-

power limiting post amplier. The board is an easy-to-use,

single-layer high-speed microstrip design. It is designed to

be driven by a high-speed 155Mbps pattern generator and

provides on-board 50 terminations for the generator’sΩ

outputs. The input termination network also provides the

required input bias of VCC–1.3V for the SY88813V.

The SY88813V evaluation board is intended to be

terminated to a 50 scope and provides for simple userΩ

adjustability of the SD threshold through the adjustment of

an on-board potentiometer. This allows the user to evaluate

various parameters of the SY88813V, 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.

EVALUATION BOARD

Figure 1.SY88813V Evaluation Board

Product specificaties