SY88347DL Datasheet, PDF (1/9 Pages) Micrel Semiconductor – 3.3V, 3.2Gbps PECL Limiting Post Amplifier with High-Gain TTL Loss-of-Signal

SY88347DL
3.3V, 3.2Gbps PECL Limiting Post Amplifier
with High-Gain TTL Loss-of-Signal
General Description
The SY88347DL 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 SY88347DL quantizes these signals and
outputs PECL-level waveforms.
The SY88347DL 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 5mV_PP, can be
amplified to drive devices with PECL inputs.
The SY88347DL generates a high-gain loss-of-signal
(LOS) open-collector TTL output. The LOS function has
a high-gain input stage for increased sensitivity. 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, 3.3dB LOS hysteresis is provided to prevent
chattering.
Datasheet and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• Single 3.3V power supply
• 155Mbps to 3.2Gbps operation
• Low-noise PECL data outputs
• High-gain LOS output
• Chatter-free Open-Collector TTL Loss-of-Signal
(LOS) output
• TTL /EN input
• Programmable LOS level set (LOS_LVL)
• Ideal for multi-rate applications
• Available in a tiny 10-pin EPAD-MSOP
Applications
• APON, BPON, EPON, GEPON, and GPON
• 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
• FTTP
• Optical transceivers
• Datacom/Telecom
• Low-gain TIA interface
• Long reach FOM
MLF and MicroLeadFrame are registered trademarks of Amkor Technology.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
February 2007
M9999-021707-B
[e-mail] or [phone]