Microchip SY88903AL Manual

Microchip Ikke kategoriseret SY88903AL

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Side 1/7
3.3V, 1.25Gbps PECL High-Sensitivity
Limiting Post Amplifier with TTL
Loss-of-Signal
SY88903AL Evaluation Board
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
January 2006
M9999-010406-B
hbwhelp@micrel.com or (408) 955-1690
General Description
The SY88903AL 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 SY88903AL quantizes these
signals and outputs PECL-level waveforms.
The SY88903AL operates from a single +3.3V power
supply, over an industrial temperature range of –40°C
to +85°C. With its wide bandwidth and high gain
signals and with data rates up to 1.25Gbps, and as
small as 5mV
pp
, it can be amplified to drive devices
with PECL inputs.
The SY88903AL generates a high-gain, loss-of-signal
(LOS), open-collector, TTL output. The LOS function
has a high gain input stage for increased 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 enable bar (/EN) input to
maintain output stability under a loss-of-signal
condition. Typically, 3.4dB LOS hysteresis is provided
to prevent chattering.
This manual provides information on the SY88903AL
evaluation board. It should be used in conjunction with
the SY88903AL data sheet, which contains full
specifications of the SY88903AL.
The SY88903AL evaluation board enables fast and
thorough evaluation of the SY88903AL. The board is
an easy-to-use, single supply design. It’s designed to
be driven by a high-speed, pattern generator and
provides onboard 50Ω terminations for the generator’s
outputs. The input termination network also provides
the required input bias of V
CC
–1.3V for the
SY88903AL.
The SY88903AL evaluation board is intended to
terminate to a 50Ω scope and provides for simple user
adjustability of the LOS threshold through the
adjustment of an on-board potentiometer.
All data sheets and support documentation can be
found on Micrel’s web site at: www.micrel.com.
Features
• Single 3.3V supply
• DC-to-1.25Gbps operation
• Low-noise PECL data outputs
• High-gain LOS
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 10-pin MSOP
• AC-coupled I/O with SMA connectors
• 50Ω input network termination
Related Documentation
• SY88903AL, 3.3V, 1.25Gbps PECL High-
Sensitivity Limiting Post Amplifier w/ TTL LOS Data
Sheet
Evaluation Board

Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: SY88903AL

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