SY84113BU

Low Power 2.5V 1.25Gbps Limiting Post

Amplifier with Ultra Wide LOS Range

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (

General Description

The SY84113BU low power limiting post amplifier is

designed for use in fiber-optic optical modules for

multirate applications up to 1.25Gbps. The device

connects to a typical transimpedance amplifier (TIA) and

can produce output signals to CML-level waveforms.

Intended for the GbE and Fibre Channel applications,

the SY84113BU offers a wide LOS range. It is able to

detect input signals for as low as 5mVpp and as high as

100mVpp. The SY84113BU is intended to be used in

AC-coupled input applications.

The SY84113BU generates a Loss-of-Signal (LOS)

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

input amplitude detection. LOS asserts high if the input

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 SY84113BU operates on a single 2.5V power

supply and offers ultra low power consumption. This

device is perfectly suited to meet the stringent power

requirements of the CSFP/SFP/SFF optical modules.

All support documentation can be found on Micrel’s web

site at: www.micrel.com.

Features

• Ultra wide LOS Range (5mVpp to 100mVpp)

• Single 2.5V power supply

• Ultra low power consumption (55mW typ)

• 125Mbps to 1.25 Gbps operation

• Low-noise CML data outputs

• TTL /EN input

• Internal 50Ohm termination

• Available in a tiny 3mm x 3mm QFN package

Applications

• Gigabit Ethernet

• Fibre Channel

• GEPON

Markets

• Datacom/telecom

• Compact SFP/SFF Optical transceiver

• SFP/SFF Optical transceiver

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Typical Application

January 2011

M9999-011711-A