SY84113BU_15 Datasheet, PDF (1/11 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
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 loss-of-signal (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 LOS open-collector TTL
output. A programmable LOS 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 an LOS
condition.
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.
All support documentation can be found on Micrel’s
website at: www.micrel.com.
Features
• Ultra-wide loss-of-signal (LOS) range (5mVpp to
100mVpp)
• Single 2.5V power supply
• Ultra-low power consumption (55mW typical)
• 125Mbps to 1.25 Gbps operation
• Low-noise CML data outputs
• TTL /EN input
• Programmable LOS level (LOS_LVL)
• Internal 50Ω termination
• Available in a tiny 3mm × 3mm QFN package
• Extensive temperature range (–40°C to +95°C)
Applications
• Gigabit Ethernet
• Fibre Channel
• GEPON
Markets
• Datacom/telecom
• Compact SFP/SFF optical transceiver
• SFP/SFF optical transceiver
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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
August 11, 2015
Revision 2.0
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