Microchip SY89835U Bedienungsanleitung


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Precision/Differential 1:2 LVDS
Fanout Buffer with Internal
Termination
SY89835U 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
February 2006
M9999-021006-A
hbwhelp@micrel.com or (408) 955-1690
General Description
The SY89835U evaluation board is designed for
convenient setup and quick evaluation of the
SY89835U. The board is optimized to interface directly
to a 50 oscilloscope.Ω
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 data sheets and support documentation can be found
on Micrel’s web site at: .www.micrel.com
Features
• +2.5V 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
• SY89835U, Precision LVDS 1:2 Fanout Buffer with
Internal Termination and Fail-Safe Inputs
______________________________________________________________________________________________________
Evaluation Board
Micrel, Inc.
SY89835U Evaluation Board
February 2006
M9999-021006-A
hbwhelp@micrel.com or (408) 955-1690
Evaluation Board Description
The default configuration for the SY89835U board is
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. 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.
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 proper VCC to VEE
voltage difference.
Micrel, Inc.
SY89835U Evaluation Board
February 2006
M9999-021006-A
hbwhelp@micrel.com or (408) 955-1690
Evaluation Board
SY89835U AC-Coupled Evaluation Board
I/O
Power Supply
VCC
GND
VEE
AC-Coupled Input/AC-Coupled Output
2.5V
+2.5V
0V
0V
Table 1. SY89835U AC-Coupled Evaluation Board Power Supply Connections


Produktspezifikationen

Marke: Microchip
Kategorie: Nicht kategorisiert
Modell: SY89835U

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