SY88289BL Datasheet, PDF (1/9 Pages) Micrel Semiconductor – 3.3V, 3.2Gbps CML Limiting Post Amplifier with High-Gain TTL Loss-of-Signal

SY88289BL
3.3V, 3.2Gbps CML Limiting Post Amplifier
with High-Gain TTL Loss-of-Signal
General Description
The SY88289BL 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 SY88289BL quantizes these signals and
outputs CML level waveforms.
The SY88289BL operates from a single +3.3V power
supply, over temperatures ranging from –40^oC to +85^oC.
With its wide bandwidth, high gain, and 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 SY88289BL generates a high-gain loss-of-signal
(LOS) open-collector TTL output. This function has a
high-gain input stage for increased LOS 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.
All support documentation cab 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 signal detect (LOS)
output with internal 4.75kΩ pull-up resistor
• TTL /EN input
• Programmable LOS level set (LOS_LVL)
• Ideal for mutil-rate applications
• Available in a tiny 16-pin MLF^® 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
Typical Application
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
M9999-021207-B
[e-mail] or [phone]