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SY88813V

Micrel, Inc.

M9999-072505

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

3.3V/5V 155Mbps PECL LOW POWER

LIMITING POST AMPLIFIER WITH PECL

SIGNAL DETECT

SY88813V

Rev.: B

Amendment: /0

Issue Date:

July 2005

TYPICAL APPLICATIONS CIRCUIT

APPLICATIONS

s 155Mbps SONET/SDH

s Small form factor transceivers

s High-gain line driver and line receiver

s Single 3.3V or 5V power supply

s Up to 155Mbps operation

s Low noise PECL data outputs

s Chatter-free PECL Signal Detect (SD) output

s TTL /EN input

s Programmable SD level set (SD

s Available in a tiny 10-pin MSOP (3mm) package

FEATURES

DESCRIPTION

The SY88813V low power limiting post amplifier is

designed for use in fiber-optic receivers. 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 SY88813V

quantizes these signals and outputs PECL level waveforms.

The SY88813V operates from a single +3.3V or +5V

power supply, over temperatures ranging from –40

°C to

+85

°C. With its wide bandwidth and high gain, signals with

data rates up to 155Mbps and as small as 5mV

amplified to drive devices with PECL inputs.

The SY88813V generates a PECL signal-detect output.

A programmable signal-detect level set pin (SD

the sensitivity of the input amplitude detection. SD asserts

high if the input amplitude rises above the threshold set by

SD

output signal without removing the input signal. Typically

4.6dB SD hysteresis is provided to prevent chattering.

/EN

GND

GND

To

CDR

SY88813V

3k

Ω

From

Transimpedance

Amp.

0.1

µF

0.1

µF

0.1

µF

0.1

µF

SD

50

Ω

50

Ω

100

Ω