SY88063AL

3.3V, 12.5Gbps Limiting Post Amplifier with

Automatic Digital Offset Correction

Micrel Inc. • 2180 Fort

www.micrel.com

une Drive • San Jose, CA 95131 • USA • tel +1 (

General Description

The SY88063AL is a multi-rate limiting post amplifier

designed for fiber-optic transceivers applications up to

12.5Gbps. It features an automatic digital offset correction

function. The offset correction feature will automatically

counteract any inherent offset present in the input signal

and amplifier. The highly sensitive SY88063AL can amplify

input signals as low as 20mVpp at 12.5Gbps or 10mVpp at

10.3Gbps to differential CML output levels.

The SY88063AL 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 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 implement the

squelch function that maintains output stability under a

loss-of-signal condition.

The SY88063AL operates from a single +3.3V power

supply, over –40

3mm 16-pin QFN package.

All support documentation can be found on Micrel’s web

site at: www.micrel.com.

Features

• Up to 12.5Gbps operation

• Automatic Digital Offset Correction

• Programmable LOS level (LOSLVL)

• Squelching function to maintain output stability

• Low-noise CML data outputs

• TTL /EN input

• Small 3mm x 3mm QFN package

Applications

• 1x/2x/4x/8x Fibre Channel

• SR/LR SFP+ Optical Transceiver

• 10GPON ONU

• SONET/SDH:OC192 – STM64

Markets

• Datacom/telecom

• Optical transceiver

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Typical Application

September 2011

M9999-090911-B