Instrukcja obsługi Microchip SY88343BL

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SY88343BL

3.3V, 3.2Gbps CML Limiting Post Amplifier

with High Gain TTL Loss-ofSignal-

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

February 2007

M9999 02170-7-B

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

General Description

The SY88343BL low-power limiting post amplifier is

designed for use in fiberoptic receivers. The device -

connects to typical transimpedance amplifiers (TIAs)

that are ACcoupled. The linear signal output from TIAs -

can contain significant amounts of noise and may vary

in amplitude over time. The SY88343BL quantizes these

signals and outputs CML-level waveforms.

The SY88343BL operates from a single +3.3V power

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

With its wide bandwidth and high gain, signals with data

rates up to 3.2Gbps and as small as 5mVPP can be

amplified to drive devices with CML inputs or AC-

coupled CML/PECL inputs.

The SY88343BL generates a high-gain loss-ofsignal -

(LOS) opencollector TTL output. The LOS function- has

a high gain input stage for increased sensitivity. A

programmable losssignal level set pin-of- (LOSLVL) sets

the sensitivity of the input amplitude detection. LOS

asserts high if the input amplitude falls below the

threshold set by LOSLVL-and deasserts low otherwise.

The enable bar input (/EN) deasserts 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 losssignal condition. -of-

Typically, 3.5dB LOS hysteresisis provided to prevent

chattering.

Datasheet and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Features

• Single 3.3V power supply

• DC to 3.2Gbps operation

•- Lownoise CML data outputs

• High gain LOS

•----Chatterfree OpenCollector TTL LossofSignal

(LOS) output with internal 4.75kup resistorΩ pull-

• TTL /EN input

•Programmable LOS level set (LOSLVL)

•- Ideal for multirate applications

•---Available in a tiny 10pin EPADMSOP and 16pin

QFN package

Applications

• APON, BPON, EPON, and GPON

• Gigabit Ethernet

• Fibre Channel

•-- OC3 and OC12/24 SONET/SDH

•- Highgain line driver and line receiver

Markets

• FTTP

• Optical transceivers

• Datacom/Telecom

•- Lowgain TIA interface

• Long reach FOM

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