Microchip SY89856U Manual

Microchip Ikke kategoriseret SY89856U

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Side 1/8
2.0GHz, Low Power, 1:6 LVPECL
Fanout Buffer with 2:1 Input MUX
and Internal Termination
SY89856U Evaluation Board
MLF and MicroLeadFrame are trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
March 2005
M9999-031505
hbwhelp@micrel.com or (408) 955-1690
General Description
The SY89856U evaluation board is designed for
convenient setup and quick evaluation of the
SY89856U. The board is optimized to interface directly
to a 50Ω oscilloscope.
For best AC performance, the board is configured in AC-
coupled In and AC-coupled Out configuration. For
applications that require a DC-coupled configuration,
step-by-step instructions for modifying the board are
included.
Features
• Fully assembled and tested SY89856U
• +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
• SY89856U 2.0GHz, Low Power, 1:6 LVPECL
Fanout Buffer with 2:1 Input MUX and Internal
Termination Data Sheet
_______________________________________________________________________________________________________
Evaluation Board
Micrel, Inc. SY89856U Evaluation Board
March 2005
2 M9999-031505
hbwhelp@micrel.com or (408) 955-1690
Evaluation Board Description
The default configuration for the SY89856U board is
AC-coupled. The choice between AC-coupled and DC-
coupled configurations offers the user flexibility for
specific applications. With the current board layout, Q0
is meant for DC-coupled operation. In default AC-
coupled configuration, Q0 is not brought out.
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 applications 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 V
CC
, and standard PECL
termination is 50Ω to V
CC
-2V. Split-supply is an easy
method to interface to a 50Ω (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
provides the correct terminations for the device by
setting the Ground potential on the board to be exactly 2
volts below the V
CC
supply. The V
EE
voltage is then set
to –1.3V for 3.3V devices, or –0.5V for 2.5V devices to
ensure proper V
CC
to V
EE
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: SY89856U

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