SY88305BL Datasheet, PDF (1/11 Pages) Micrel Semiconductor – 3.3V, 3.2Gbps CML Limiting Post Amplifier with Wide Signal-Detect Range

SY88305BL
3.3V, 3.2Gbps CML Limiting Post Amplifier
with Wide Signal-Detect Range
General Description
The SY88305BL low-power limiting post amplifiers are
designed for use in fiber-optic receivers. These devices
connect 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 SY88305BL quantizes these signals and output
CML-level waveforms.
The SY88305BL operates from a single +3.3V power
supply, over temperatures ranging from –40^oC to +85^oC.
With their wide bandwidth and high gain, signals with
data rates up to 3.2Gbps, and as small as 10mV_PP, can
be amplified to drive devices with CML/PECL inputs.
The device generates a Signal Detect (SD) open-
collector TTL output. The SD function is optimized to
detect a larger and wider input range, as shown in the
characteristic curve on Page 6. 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 sets by SD_LVL and de-asserts low otherwise.
The SD output can be fed back to the EN input to
maintain stability. Typically, 3.5dB LOS/SD hysteresis is
provided to prevent chattering.
Datasheet and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• Signal Detect circuit optimized to detect a wide input
range
• Chatter-free Open-Collector TTL Signal-Detect (SD)
• Single 3.3V power supply
• 155Mbps to 3.2Gbps operation
• Low-noise CML data outputs
• Programmable SD level set (SD_LVL)
• Available in a tiny 10-pin EPAD-MSOP and 16-pin
QFN package
Applications
• PON
• Gigabit Ethernet
• 1X and 2X Fibre Channel
• SONET/SDH: OC-3/12/24/48 – STM 1/4/8/16
• High-gain line driver and line receiver
Markets
• FTTX
• 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
November 2007
M9999-110207-A
[e-mail] or [phone]