SY88343HL Datasheet, PDF (1/9 Pages) Micrel Semiconductor – 3.3V, 3.2Gbps CML Limiting Post Amplifier with High-Gain TTL Loss-of-Signal

SY88343HL
3.3V, 3.2Gbps CML Limiting Post Amplifier
with High-Gain TTL Loss-of-Signal
General Description
The SY88343HL 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 SY88343HL quantizes these
signals and outputs CML level waveforms.
The SY88343HL 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 SY88343HL 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 can be found on Micrel’s web
site at: www.micrel.com.
Features
• High input sensitivity: 4mV_PP
• Single 3.3V power supply
• 155Mbps 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 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
• APON, BPON, EPON, GEPON, and GPON
• SFP/SFF/GBIC optical transceivers
• Gigabit Ethernet
• 1X and 2X Fibre Channel
• SONET/SDH: OC 3/12/24/48 – STM ¼/8/16
• 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]