Microchip SY88933AL Manual

Microchip Ikke kategoriseret SY88933AL

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Side 1/8
3.3V, 1.25Gbps PECL High-Sensitivity
Limiting Post Amplifier with TTL
Signal Detect
SY88933AL 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
June 2005
M9999-062705
hbwhelp@micrel.com or (408) 955-1690
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 an industrial temperature range of –40°C
to +85°C. With its wide bandwidth and high gain
signals 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 enable (EN) input to
maintain output stability under a loss-of-signal
condition. Typically, 3.4dB SD hysteresis is provided
to prevent chattering.
This manual provides information on the SY88933AL
evaluation board. It should be used in conjunction with
the SY88933AL data sheet, which contains full
specifications of the SY88933AL.
The SY88933AL evaluation board enables fast and
thorough evaluation of the SY88933AL. 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
SY88933AL.
The SY88933AL evaluation board is intended to
terminate to a 50Ω scope and provides for simple user
adjustability of the SD threshold through the
adjustment of an on-board potentiometer.
All data sheets and support documentation can be 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 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
• AC-coupled I/O with SMA connectors
• 50Ω input network termination
Related Documentation
• SY88933AL, 3.3V, 1.25Gbps PECL High-
Sensitivity Limiting Post Amplifier w/ TTL SD Data
Sheet
Evaluation Board

Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: SY88933AL

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