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ANTC204

SY88149NDL and SY88349NDL

Burst Mode Limiting Post Amplifiers

Introduction

This document explainsto use theSY88149NDL and SY88349NDL burst mode limiting amplifiers in different how

applications including 1G/10GEPON, XGPON.1, GE--PON/GPON, Gigabit Ethernet, Fibre Channel, OC3/12/24

SONET/SDH, and OBSAI/CPRI.

The SY88149NDL (resp. SY88349NDL) is a highsensitivity limiting post amplifier that can am-plify signals as

small as 5mVPP with data rates up to 1.25Gbps (resp. 2.5Gbps). The parts offer LOS or SD outputs depending on

the LOS/SD SEL option. The LOS/SD output can be fed back to JAM input for output stability when there is no the

data present at the input. LOS/SDLVL sets the threshold for the input signal detection.

Both amplifiers offer a fast SD assert (LOS deassert) time of 5ns and a fast SD deassert (LOS assert) time of --

5ns if manual RESET is used or 120ns if /AUTORESET is used.

Noise Discriminator

The noise discriminator feature is intended for PON OLT applications withgain burstmode TIAs where noise -high-

can trigger a false LOS deassert or SD assert while no input data is present. The noise discriminator will filter -

input data through aseries of specialized circuitsthat will only trigger LOS/SD on the rising edge of a valid PON

1.244Gbpsnoise (resp. 2.488Gbps)preamble bit stream (10101). The SY88149NDL (resp. SY88349NDL)

discriminator is designed to accept a 1.244(resp. 2.488preamble burst. Any Gbps 300bps±M Gbps 300bps)±M

other bit pattern will be rejected. If thed at any other data rate, the noise discriminator should be is part is us

disabled.

The noise discriminator, implemented in the edge detector circuit, can be selected or bypassed by selecting the

proper resistor value using the settings at as shown in the LOS/SDSEL pin, Table 1.

Table 1. Truth Table for SD/LOS Select and Noise Discriminator function

LOS/SDSEL PLOS/SD Sin election N Doiseiscriminator I To O nputJAMutputs

0 SD Ωto VCCEnabled HIGHEnabled

0 SD Ωto VCCEnabled LOWDisabled

16k DisabledΩ SD to VCC HIGHEnabled

16k DisabledΩ SD to VCC LOWDisabled

16k DisabledΩ to GNDLOS HIGHDisabled

16k DisabledΩ to GNDLOS LOWEnabled

0 Ωto GNDLOSEnabled HIGHDisabled

0 Ωto GNDLOSEnabled LOWEnabled

Micrel Inc. • 2180 Fortune Drive • Jose, CA 95131 • USA • tel +1 (408) 9440800 • fax + 1 (408) 4741000 • San --http://www.micrel.com

April 23, 2014 Revision 1.1

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