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3.3V, 1.25Gbps PECL Limiting Post

Amplifier with High-Gain TTL Loss-of-

Signal

SY88147DL Evaluation Board

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

January 2006

M9999-011606-A

[email protected] or (408) 955-1690

General Description

The SY88147DL high-sensitivity, 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 significant amounts of noise and may vary

in amplitude over time. The SY88147DL quantizes

these signals and outputs PECL-level waveforms.

The SY88147DL operates from a single +3.3V power

supply, over an industrial temperature range of –40°C

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

signal with data rates up to 1.25Gbps, and as small as

5mV

pp

can be amplified to drive devices with PECL

inputs.

The SY88147DL features an open-collector, TTL loss-

of-signal (LOS) indicator. The LOS function has a high

gain input stage for increased sensitivity. A

programmable loss-of-signal level set pin (LOS

LVL

)

sets the sensitivity of the input amplitude detection.

LOS asserts high if the input amplitude falls below the

threshold set by LOS

LVL

and de-asserts low otherwise.

The enable bar input (/EN) de-asserts the true output

signal without removing the input signal. The LOS

output can be fed back to the enable bar (/EN) input to

maintain output stability under a loss-of-signal

condition. Typically, 3.5dB LOS hysteresis is provided

to prevent chattering.

This manual provides information on the SY88147DL

evaluation board. It should be used in conjunction with

the SY88147DL data sheet, which contains the full

specifications of the SY88147DL.

The SY88147DL evaluation board enables fast and

thorough evaluation of the SY88147DL. The board is

an easy-to-use, single supply design. It’s designed to

be driven by a high-speed, pattern generator and

provides onboard 50Ω terminations for the generator’s

outputs. The input termination network also provides

the required input bias of V

CC

–1.3V for the

SY88147DL.

The SY889147DL evaluation board is intended to

terminate to a 50Ω scope and provides for simple user

adjustability of the LOS threshold through the

adjustment of an on-board potentiometer.

All data sheets and support documentation can be

found on Micrel’s web site at: www.micrel.com.

Features

•Single 3.3V supply

•DC-to-1.25Gbps operation

•Low-noise PECL data outputs

•LOS Indicator

•Chatter-free open-collector TTL loss-of-signal

(LOS) output with internal 4.75kΩ pull-up resistor

•TTL /EN input

•Programmable LOS level set (LOS

LVL

)

•AC-coupled I/O with SMA connectors

•50Ω input network termination

Related Documentation

•SY88147DL, 3.3V, 1.25Gbps PECL Limiting Post

Amplifier w/ High-Gain TTL LOS Data Sheet

Evaluation Board

Product specificaties