Microchip SY89858U Manual

Microchip Ikke kategoriseret SY89858U

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Side 1/9
Precision 1:8 LVPECL Fanout
Buffer with Internal Termination
SY89858U 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
December 2004 M9999-12060
4
hbwhelp@micrel.com or (408) 955-169
0
General Description
The SY89858U evaluation board is designed for
convenient setup and quick evaluation of the
SY89858U. The boards are optimized to interface
directly to a 50 oscilloscope.
For best AC performance, the boards are configured in
AC-coupled in/AC-coupled out configuration. For
applications that require a DC-coupled configuration,
step-by-step instructions for modifying the board are
included.
Data sheets and support documentation can be found
on Micrel’s web site at www.micrel.com.
Features
• Fully assembled and tested SY89858U
• +2.5V or +3.3V power supply
• AC-coupled configuration for ease-of-use
• I/O interface includes on-board termination
• Fully assembled and tested
• Can be reconfigured for DC-coupling operation
Related Documentation
• SY89858U Precision 1:8 LVPECL Fanout Buffer with
Internal Termination
_________________________________________________________________________________________________________
Evaluation Board
Micrel, Inc. SY89858U Evaluation Board
December 2004 2M9999-12060
4
hbwhelp@micrel.com or (408) 955-169
0
Evaluation Board Description
The default configuration for the SY89858U board is
the AC-coupled. The choice between AC-coupled and
DC-coupled configurations offers the user flexibility for
specific applications.
AC-Coupled Evaluation Board
The AC-coupled configuration is suited to most
customer applications and is preferred by the majority
of users because of its ease-of-use. It requires only a
single power supply and offers the most flexibility in
interfacing to a variety of signal sources.
The DC-bias levels and AC-coupling capacitors are
supplied on-board for each input, making it
unnecessary to vary the offset voltage or change any
components on the board as the power supply voltage
varies over the +2.5V +5% and +3.3V +10% operating
range. The user needs only to supply a minimum input
voltage swing and the bias voltage will automatically
adjust the input to the correct level as the power
supply voltage varies.
DC-Coupled Evaluation Board
For applications that are not suited to AC-coupling,
such as clock that can be turned off for extended
periods of time, the board can be user-configured for
DC-coupled operation.
This can be accomplished by modifying the board to
use two power supplies into a “split-supply
configuration.” Since LVPECL is referenced to VCC,
and standard PECL termination is 50W to VCC-2V.
Split-supply is an easy method to interface to a 50W
(to ground) scope. Therefore, a 3.3V supply will be
split into +2V and -1.3V, and a 2.5V supply will be split
into a +2V and -0.5V.
The +2V offset in this two-power supply configuration
then provides the correct terminations for the device
by setting the Ground potential on the board to be
exactly 2 volts below the VCC supply. The VEE voltage
is then set to –1.3V for 3.3V devices, or –0.5V for
2.5V devices to ensure proper VCC to VEE voltage
difference.
Any-Input Interface
The unique internal input termination sets the input
common mode voltage. This enables the input to
interface with any differential signal over the supply
voltage without modifying the board.

Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: SY89858U

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