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Micrel Semiconductor

SY88353BL Datasheet Preview

SY88353BL Datasheet

Limiting Post Amplifier

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SY88353BL
3.3V, 3.2 Gbps Limiting Post Amplifier with
Programmable Decision Threshold
General Description
The SY88353BL limiting post amplifier is designed for
use in fiber-optic receivers, and is specially optimized for
WDM applications where optical amplifiers such as
EDFAs and Raman amplifier are used. The device
connects to typical transimpedance amplifiers (TIAs).
The linear signal from TIAs can contain significant
amounts of noise that is unevenly distributed between
top and bottom rails due to the ASE noise generated by
the optical amplifiers, crosstalk, or non-linear effect in
the fiber. In order to optimize the BER in such noisy
conditions, the decision threshold between bit 1 and bit
0, needs to be moved to the rail that contains less noise.
The SY88353BL features a pin at which an external
voltage can be applied to move the crossing point up
and down, from 20% to 80%, for BER optimization
purposes.
The SY88353BL operates from a single +3.3V power
supply, over temperatures ranging from –40oC to +85oC.
Signals with data rates from 155Mbps up to 3.2Gbps,
and as small as10mVpp, can be amplified to drive
devices with CML or PECL inputs.
The SY88353L features 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 sets by LOSLVL and
de-asserts low otherwise. The enable bar 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 maintain output stability under a loss-of-signal
condition. Typically, 3.3dB LOS hysteresis is provided to
prevent chattering.
All support documentation can be found on Micrel’s web
site at: www.micrel.com.
Features
Single 3.3V power supply
Fast LOS release/assert
155Mbps to 3.2Gbps operation
Low-noise CML data outputs
Chatter-free Open-Collector TTL loss-of-signal (LOS)
output
TTL /EN input
Programmable LOS level set (LOSLVL)
Programmable Decision Threshold
Available in a tiny 3mm x 3mm MLF® package
Applications
WDM Systems
Gigabit Ethernet, 1X and 2X Fibre Channel
SONET/SDH: OC-3/12/24/48 – STM1/4/8/16
Low-gain TIA interface
Markets
Datacom/telecom
Optical transceiver
MLF and MicroLeadFrame are registered trademarks of Amkor Technology.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
February 2007
1 M9999-021707-B
hbwhelp@micrel.com or (408) 955-1690




Micrel Semiconductor

SY88353BL Datasheet Preview

SY88353BL Datasheet

Limiting Post Amplifier

No Preview Available !

Micrel, Inc.
Typical Application Circuit
SY88353BL
Programmable Decision Threshold
Ordering Information
Part Number
Package
Type
SY88353BLMG
MLF-16
SY88353BLMGTR(1)
MLF16
Note:
1. Tape and Reel.
Operating
Range
Industrial
Industrial
Fixed Decision Threshold
Package Marking
353B with Pb-Free bar line indicator
353B with Pb-Free bar line indicator
Lead
Finish
NiPdAu
Pb-Free
NiPdAu
Pb-Free
Pin Configuration
February 2007
16-Pin MLF® (MLF-16)
2
M9999-021707-B
hbwhelp@micrel.com or (408) 955-1690


Part Number SY88353BL
Description Limiting Post Amplifier
Maker Micrel Semiconductor
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