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Precision CML/LVPECL/LVDS 1:2
Fanout Buffer with Internal
Termination and Fail Safe Input
SY58606/7/8U 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
November 2006
M9999-110106-A
hbwhelp@micrel.com or (408) 955-1690
General Description
The SY58606U, SY58607U, and SY58608U evaluation
boards are designed for convenient setup and quick
evaluation of the respective devices. They allow the
user to evaluate the part over the full voltage-range of
the part without requiring any modifications to the board.
The board is optimized to interface directly to a 50Ω
oscilloscope.
The board is designed in multiple layers for better
performance and simple signal evaluation. 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.
All datasheets and support documentation can be found
on Micrel’s web site at: .www.micrel.com
Features
• SY58606U CML outputs
• SY58607U LVPECL outputs
• SY58608U LVDS outputs
• +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-coupled operation
Related Documentation
• SY58606U, 4.25Gbps Precision CML 1:2 Fanout
Buffer with Internal Termination and Fail-Safe Inputs
• SY58607U, 3.2Gbps Precision LVPECL 1:2 Fanout
Buffer with Internal Termination and Fail-Safe Inputs
• SY58608U, 3.2Gbps Precision LVDS 1:2 Fanout
Buffer with Internal Termination and Fail-Safe Inputs
______________________________________________________________________________________________________
Evaluation Board
Micrel, Inc.
SY58606/7/8U Evaluation Board
November 2006
M9999-110106-A
hbwhelp@micrel.com or (408) 955-1690
Evaluation Board Description
The SY58606U, SY58607U, and SY58608U share a
common evaluation board. The individual evaluation
boards are labeled to identify the specific device and the
configuration, for that board. The SY58606U,
SY58607U, and SY58608U are CML, LVPECL, and
LVDS output evaluation boards respectively.
The default configuration for the boards is the AC-
coupled configuration and all boards are shipped with
this configuration. The choice between two
configurations offers the user flexibility in selecting the
board that is right for this particular application.
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. The user only needs
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
SY58606U DC-Coupled Evaluation Boards
To allow the CML outputs to be used in a DC-coupled
configuration with a scope that has a standard 50 toΩ
GND termination, the power supplies are configured to
offset the voltage of the evaluation board to be negative.
For a 2.5V configuration the VCC and GND of the board
are set to 0V and the VEE is set to -2.5V. For a 3.3V
configuration the VCC and GND of the board are set to
0V and the V EE
is set to -3.3V. This allows the body of
the SMA connectors, which are scope GND, to appear
at the same potential as VCC for the CML output drivers.
SY58607U DC-Coupled Evaluation Boards
For DC-coupled operation, the boards can be modified
to use two power supplies in a “split-supply
configuration.” The term split-supply simply means the
+3.3V supply is split into a +2V and -1.3V, or for a +2.5V
supply it is split into a +2V and -0.5V power supply
configuration. This effectively offsets the board by +2V.
The +2V offset in this two-power supply configuration
then provides the correct terminations of 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 so
the device power pins still see a full 3.3V or 2.5V
potential between VCC and VEE.
SY58608U DC-Coupled Evaluation Boards
DC-coupled operation can be accomplished by
modifying the board to use two power supplies into a
“split-supply configuration”. In order to correctly interface
LVDS to a 50 -(to-ground) scope, VΩCC must be VOCM
above the GND level. Therefore, a 2.5V supply will be
split into +1.2V and -1.3V to ensure to ensure proper
VCC to VEE voltage difference.
Step-by-step instructions for modifying an AC-coupled
evaluation board for DC-coupled operation are supplied
in the section “Modifying your AC-coupled Board for DC-
Coupled Operation.”
Micrel, Inc.
SY58606/7/8U Evaluation Board
November 2006
M9999-110106-A
hbwhelp@micrel.com or (408) 955-1690
Evaluation Board
SY58606U AC-Coupled Evaluation Board
SY58606U DC-Coupled Evaluation Board
I/O
Power Supply
VCC
GND
VEE
AC-Coupled Input/AC-Coupled Output
2.5V
+2.5V
0V
0V
AC-Coupled Input/AC-Coupled Output
3.3V
+3.3V
0V
0V
AC-Coupled Input/DC-Coupled Output
2.5V
0V
0V
-2.5V
AC-Coupled Input/DC-Coupled Output
3.3V
0V
0V
-3.3V

Produktspecifikationer

Varumärke: Microchip
Kategori: Inte kategoriserad
Modell: SY58606U

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