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Microchip Inte kategoriserad SY89645L

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Precision Low Skew, 1-to-4 LVCMOS/LVTTL-
to-LVDS Fanout Buffer
SY89645L 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
September 2006
M9999-091906-A
hbwhelp@micrel.com or (408) 955-1690
General Description
The SY89645L evaluation board is designed for
convenient setup and quick evaluation of the SY89645L
fanout buffer. The board is optimized to interface directly
to a 50Ω oscilloscope.
For quick and convenient evaluation of this part, the
board is AC-coupled. For applications that require a DC-
coupled configuration, step-by-step instructions for
modifying the board are included.
Features
• +3.3V power supply for the SY89645L
• AC-coupled configuration
• I/O interface includes on-board termination
• Fully assembled and tested
• Can be reconfigured for DC-coupled operation
Related Documentation
• SY89645L Precision Low Skew, 1-to-4
LVCMOS/LVTTL-to-LVDS Fanout Buffer Datasheet
_________________________________________________________________________________________________________
Evaluation Board
Micrel, Inc. SY89645L Evaluation Board
September 2006
2 M9999-091906-A
hbwhelp@micrel.com or (408) 955-1690
Evaluation Board Description
The default configuration for the SY89645L board is AC-
coupled. The choice between AC- and DC-coupled
configurations offers the user flexibility for specific
applications.
AC-Coupled Evaluation Board
The SY89645L default configuration is set up for AC-
coupled operation. In the AC-coupled configuration, the
output voltage offset is automatically adjusted to
interface directly with a 50Ω (to GND) scope.
For quick evaluation of the SY89645L, connect V
CC
to
3.3V and V
EE
and GND to 0V.
DC-Coupled Evaluation Board
The SY89645L evaluation board can be reconfigured for
DC-coupled operation. This 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 50Ω (to ground) scope, V
CC
must be V
OCM
above the GND level. Therefore, a 3.3V supply will be
split into +1.2V and -2.1V to ensure proper V
CC
to V
EE
voltage difference.
Output Disable
The SY89645L provides a disable output function.
When CLK_EN is pulled HIGH, the output buffer is
disabled. Output Q switches to a LOW state and /Q
output switches to a HIGH state.
Micrel, Inc. SY89645L Evaluation Board
September 2006
3 M9999-091906-A
hbwhelp@micrel.com or (408) 955-1690
Evaluation Board
Note: R1 and R2 terminate trace at SMA pad.
SY89645L AC-Coupled Evaluation Board
I/O Power Supply V
CC
GND V
EE
DC-Coupled Input/AC-Coupled Output 3.3V 3.3V 0V 0V
Table 1. Quick Start SY89645L AC-Coupled Evaluation Board Power Supply Connections.

Produktspecifikationer

Varumärke: Microchip
Kategori: Inte kategoriserad
Modell: SY89645L

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