SY88289HL Datasheet, PDF (1/9 Pages) Micrel Semiconductor – 3.3V, 3.2Gbps High-Gain CML Limiting Amplifier with High-sensitivity Loss-of-Signal Detection

SY88289HL
3.3V, 3.2Gbps High-Gain CML Limiting
Amplifier with High-sensitivity Loss-of-Signal
Detection
General Description
The SY88289HL low-power, high-sensitivity, 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 SY88289HL quantizes these
signals and outputs CML-level waveforms.
The SY88289HL 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 4mV_PP, it can be
amplified to drive devices with CML/PECL inputs.
The SY88289HL 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 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.
All support documentation can be found on Micrel’s web
site at: www.micrel.com.
Features
• High input sensitivity: 4mV_PP
• I/O compatible to Analog Devices’ ADN2891
• Single 3.3V power supply
• 125Mbps to 3.2Gbps operation
• Ideal for multi-rate applications
• Low-noise CML data outputs
• High-sensitivity Loss-of-Signal (LOS) detection
• Chatter-free open-collector TTL Loss-of-Signal (LOS)
output with an internal 4.75kΩ pull -up resistor
• TTL /EN input
• Programmable LOS level set (LOS_LVL)
• Available in a tiny (3mm x 3mm) 16-pin QFN
package
Applications
• PON
• SFP/SFF/GBIC optical transceivers
• Gigabit Ethernet
• 1X and 2X Fibre Channel
• SONET/SDH: OC 3/12/24/48 – STM 1/4/8/16
• Line driver and line receiver
Markets
• FTTX
• Datacom/Telecom
Typical Application
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
August 2007
M9999-082007-A
[e-mail] or [phone]