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SY88913

Micrel, Inc.

M9999-081505

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

DESCRIPTION

s Up to 1.25Gbps operation

s Low noise

s Chatter-Free /LOS Generation

s PECL /LOS Output

s TTL /EN Input

s Differential PECL inputs for data

s /EN input is TTL with internal 27K pull-up

s Single power supply

s Designed for use with SY88902 and SY88904

s Available in a tiny 10-pin (3mm x3 mm) MSOP

The SY88913 limiting post amplifier with its high gain

and wide bandwidth is ideal for use as a post amplifier in

fiber-optic receivers with data rates up to 1.25Gbps.

Signals as small as 5mVp-p can be amplified to drive

devices with PECL inputs. The SY88913

generates a

chatter-free PECL Loss of Signal (/LOS).

The SY88913 incorporates a programmble level detect

function to identify when the input signal has been lost.

This information can be fed back to the /EN input of the

device to maintain stability under loss of signal conditions.

Figure 2. Figure 3 shows the relationship between input

shows the relationship between input level sensitivity and

resistor divider ratio.

FEATURES

1.25Gbps HIGH-SPEED

LIMITING POST AMPLIFIER

SY88913

APPLICATIONS

s 1.25Gbps Gigabit Ethernet

s 531Mbps and 1062Mbps Fibre Channel

s 622Mbps SONET

s Gigabit Interface Converter

BLOCK DIAGRAM

Limiting

Amplifier

Level

Detect

ECL

Buffer

Enable

LOS

GND

EN

Rev.: F

Amendment: /0

Issue Date:

August 2005