SY84113BU Datasheet, PDF (1/8 Pages) Micrel Semiconductor – Low Power 2.5V 1.25Gbps Limiting Post Amplifier with Ultra Wide LOS Range

SY84113BU
Low Power 2.5V 1.25Gbps Limiting Post
Amplifier with Ultra Wide LOS Range
General Description
Features
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-
Signal level set pin (LOS_LVL) sets the sensitivity of the
input amplitude detection. LOS asserts high if the input
amplitude falls below the threshold set by LOS_LVL and
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.
• 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
• Programmable LOS level (LOS_LVL)
• Internal 50Ohm termination
• Available in a tiny 3mm x 3mm QFN package
Applications
• Gigabit Ethernet
• Fibre Channel
• GEPON
Markets
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.
• Datacom/telecom
• Compact SFP/SFF Optical transceiver
• SFP/SFF Optical transceiver
All support documentation can be found on Micrel’s web
site at: www.micrel.com.
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Typical Application
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
January 2011
M9999-011711-A
[e-mail] or [phone]