SY88303BL Datasheet, PDF (1/11 Pages) Micrel Semiconductor – 3.3V, 3.2Gbps CML Limiting Post Amplifier with Wide Loss-of-Signal Detection Range

SY88303BL
3.3V, 3.2Gbps CML Limiting Post Amplifier
with Wide Loss-of-Signal Detection Range
General Description
The SY88303BL low-power limiting post amplifiers are
designed for use in fiber-optic receivers. These devices
connect 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 SY88303BL quantizes these signals and output
CML-level waveforms.
The SY88303BL operates from a single +3.3V power
supply, over temperatures ranging from –40^oC to +85^oC.
With their wide bandwidth and high gain, signals with
data rates up to 3.2Gbps, and as small as 10mV_PP, can
be amplified to drive devices with CML/PECL inputs.
The device generates a loss-of-signal (LOS) open-
collector TTL output. The LOS function is optimized to
detect a wide input range, as shown in the typical
operating characteristic curve on Page 6. 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 sets 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.
Datasheet and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• Loss-of-signal detection circuit optimized to detect a
wide input range
• Chatter-free Open-Collector TTL Loss-of-Signal
(LOS) output
• Single 3.3V power supply
• 155Mbps to 3.2Gbps operation
• Low-noise CML data outputs
• Programmable LOS level set (LOS_LVL)
• Available in a tiny 10-pin EPAD-MSOP and 16-pin
QFN package
Applications
• PON
• Gigabit Ethernet
• 1X and 2X Fibre Channel
• SONET/SDH: OC 3/12/24/48 – STM 1/4/8/16
• High-gain line driver and line receiver
Markets
• FTTX
• Optical transceivers
• Datacom/Telecom
• Low-gain TIA interface
• Long-reach FOM
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http:www.micrel.com
November 2007
M9999-110207-A
[e-mail] or [phone]