SY88933AL_07 Datasheet, PDF (1/9 Pages) Micrel Semiconductor – 3.3V, 1.25Gbps PECL High-Sensitivity Limiting Post Amplifier w/TTL Signal Detect

SY88933AL
3.3V, 1.25Gbps PECL High-Sensitivity
Limiting Post Amplifier w/TTL Signal Detect
General Description
The SY88933AL 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 SY88933AL quantizes these signals
and outputs PECL level waveforms.
The SY88933AL operates from a single +3.3V power
supply, over temperatures ranging from –40^oC to
+85^oC. With its wide bandwidth and high gain, signal
with data rates up to 1.25Gbps and as small as 5mV_PP
can be amplified to drive devices with PECL inputs.
The SY88933AL generates a high gain signal-detect
(SD) open-collector TTL output. The SD function has a
high gain input stage for increased sensitivity. A
programmable signal-detect level set pin (SD_LVL) sets
the sensitivity of the input amplitude detection. SD
asserts high if the input amplitude rises above the
threshold set by SD_LVL and de-asserts low otherwise.
The enable input (EN) de-asserts the true output signal
without removing the input signal. The SD output can
be fed back to the EN input to maintain output stability
under a loss-of-signal condition. Typically, 3.4dB SD
hysteresis is provided to prevent chattering.
All support documentation can be found on Micrel’s
web site at: www.micrel.com.
Features
• Single 3.3V power supply
• DC-to-1.25Gbps operation
• Low-noise PECL data outputs
• High gain SD
• Chatter-free open-collector TTL signal detect (SD)
output with internal 4.75kΩ pull-up resistor
• TTL EN input
• Programmable SD level set (SD_LVL)
• Available in a tiny 10-pin MSOP package
• Pin-compatible with SY88933V
Applications
• GPON/BPON/EPON/GEPON
• Gigabit Ethernet
• 531Mbps and 1062Mbps Fibre Channel
• OC-3 and OC-12 SONET/SDH
• High-gain line driver and line receiver
• Low-gain TIA interface
Markets
• FTTX
• Optical transceiver
• Datacom/telecom
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]