SY88343BL_10 Datasheet, PDF (1/10 Pages) Micrel Semiconductor – 3.3V, 3.2Gbps CML Limiting Post Amplifier

SY88343BL
3.3V, 3.2Gbps CML Limiting Post Amplifier
with High Gain TTL Loss-of-Signal
General Description
The SY88343BL low-power limiting post amplifier is
designed for use in fiber-optic receivers. The device
connects to typical transimpedance amplifiers (TIAs)
that are AC-coupled. The linear signal output from TIAs
can contain significant amounts of noise and may vary
in amplitude over time. The SY88343BL quantizes these
signals and outputs CML-level waveforms.
The SY88343BL 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 CML inputs or AC-
coupled CML/PECL inputs.
The SY88343BL 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 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.
Datasheet and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• Single 3.3V power supply
• DC to 3.2Gbps operation
• Low-noise CML data outputs
• High gain LOS
• Chatter-free Open-Collector TTL Loss-of-Signal
(LOS) output with internal 4.75kΩ pull-up resistor
• TTL /EN input
• Programmable LOS level set (LOS_LVL)
• Ideal for multi-rate applications
• Available in a tiny 10-pin EPAD-MSOP and 16-pin
QFN package
Applications
• APON, BPON, EPON, and GPON
• Gigabit Ethernet
• Fibre Channel
• OC-3 and OC-12/24 SONET/SDH
• High-gain line driver and line receiver
Markets
• FTTP
• 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
February 2007
M9999-021707-B
[e-mail] or [phone]