SY88289AL Datasheet, PDF (1/9 Pages) Micrel Semiconductor – 3.3V, 3.2Gbps CML Low-Power Limiting Post Amplifier with TTL Loss-of-Signal

SY88289AL
3.3V, 3.2Gbps CML Low-Power Limiting
Post Amplifier with TTL Loss-of-Signal
General Description
The SY88289AL 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 SY88289AL quantizes these signals and
outputs CML-level waveforms.
The SY88289AL operates from a single +3.3V power
supply, over temperatures ranging from –40^oC to +85^oC.
With its wide bandwidth and high gain, signals with data
rates up to 3.2Gbps, and as small as 10mV_P-P, can be
amplified to drive devices with CML inputs or AC-
coupled CML/PECL inputs.
The SY88289AL 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 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, 3.5dB 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
• 125Mbps to 3.2Gbps operation
• Low-noise CML data outputs
• Chatter-free open-collector TTL Loss-of-signal (LOS)
output with internal 4.75kΩ pull-up resistor
• TTL /EN input
• Internal 50Ω input termination
• Programmable LOS level set (LOS_LVL)
• Ideal for multi-rate applications
• Available in a tiny 3mmx3mm 16-pin MLF^® package
Applications
• APON, BPON, EPON, GEPON, and GPON
• Gigabit Ethernet
• Fibre Channel
• SONET/SDH:OC-3/12/24/48 – STM 1/4/8/16
• High-gain line driver and line receiver
Markets
• Optical transceivers
• Datacom/telecom
Typical Application
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
February 2007
M9999-021207-B
[e-mail] or [phone]