SY88903AL データシートの表示（PDF） - Micrel

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SY88903AL

3.3V, Burst Mode 1.25Gbps PECL High Sensitivity Limiting Post Amplifier with TTL Loss-of-Signal

Micrel 

SY88903AL

3.3V, Burst Mode 1.25Gbps PECL High-

Sensitivity Limiting Post Amplifier with TTL

Loss-of-Signal

General Description

The SY88903AL, burst mode, high-sensitivity limiting

post amplifier is designed for use in fiber-optic receivers,

specially optimized for passive optical networks (PONs).

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 SY88903AL quantizes these

signals and outputs PECL level waveforms.

The SY88903AL operates from a single +3.3V power

supply, over temperatures ranging from –40oC to +85oC.

Signals with data rates from 622Mbps up to 1.25Gbps,

and as small as 5mVpp, can be amplified to drive

devices with PECL inputs.

The SY88903AL generates a Loss-of-Signal (LOS)

open-collector TTL output. A programmable Loss-of-

Signal level set pin (LOSLVL) sets the sensitivity of the

input amplitude detection. LOS asserts high if the input

amplitude falls below the threshold set by LOSLVL 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 /EN

input to maintain output stability under a loss-of-signal

condition. Typically, 3.4dB LOS hysteresis is provided to

prevent chattering.

All support documentation can be found on Micrel’s web

site at: www.micrel.com.

Features

• Single 3.3V power supply

• Fast LOS release/assert (<500ns) time for PON

applications

• 622Mbps to 1.25Gbps operation

• Low-noise PECL data outputs

• High gain LOS

• Chatter-free Open-Collector TTL signal detect (LOS)

output with internal 4.75kΩ pull-up resistor

• TTL /EN input

• Programmable LOS level set (LOSLVL)

• Available in a tiny 10-pin MSOP package

Applications

• GPON/GEPON/EPON

• Gigabit Ethernet, 1062Mbps Fibre Channel

• OC-12/24 SONET/SDH

• Low-gain TIA interface

• High-gain line driver and line receiver

Markets

• FTTH/FTTP

• Datacom/telecom

• Optical transceiver

February 2007

1

M9999-021707-D

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

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