Microchip SY89467/468U Manual de Usario

Microchip No categorizado SY89467/468U

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Precision 1:20 LVDS and LVPECL
Fanout Buffer w/2:1 MUX and Internal
Termination with Fail Safe Input
SY89467/468U Evaluation Board
April 2007
M9999-043007-A
hbwhelp@micrel.com or (408) 955-1690
General Description
The SY89467U and SY89468U evaluation boards are
designed for convenient setup and quick evaluation
with SMA connectors on each I/O. 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 website at: www.micrel.com.
Features
• SY89467U LVPECL outputs
• SY89468U LVDS outputs
• SMA I/O connectors
• 2 input and 3 output accessible board design
• +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
• SY89467U, Precision 1:20 LVPECL Fanout with
2:1 MUX and Internal Termination with Fail-Safe
Input Datasheet
• SY89468U, Precision 1:20 LVDS Fanout with
2:1 MUX and Internal Termination with Fail-Safe
Input Datasheet
____________________________________________________________________________________
Evaluation Board
Micrel, Inc.
SY89467/468U Evaluation Board
April 2007
M9999-043007-A
hbwhelp@micrel.com or (408) 955-1690
2
Evaluation Board Description
The SY89467U and SY89468U share a common
evaluation board with two inputs (IN0, IN1) and three
outputs (Q1, Q12, Q15). The individual evaluation
boards are labeled to identify the specific device on
that board. The SY89467U is an LVPECL-output
evaluation board and the SY89468U is an LVDS-
output evaluation board.
The default configuration for the boards is the AC-
coupled configuration. The choice between two
configurations offers flexibility for different
applications.
AC-Coupled Evaluation Board
The AC-coupled configuration is suited for 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
when 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.
SY89467U DC-Coupled 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
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 so the device power pins still
see a full 3.3V or 2.5V potential between V
CC
and V
EE
.
Step-by-step instructions for modifying an AC-coupled
evaluation board for DC-coupled operation are
supplied in the sub-section, “Modifying your AC-
Coupled Board for DC-Coupling Operation.”
SY89468U 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 50Ω-(to-ground) scope, V
CC
must
be V
OCM
above the ground level. Therefore, a 2.5V
supply will be split into +1.2V and -1.3V to ensure a
proper V
CC
to V
EE
voltage difference.
Micrel, Inc.
SY89467/468U Evaluation Board
April 2007
M9999-043007-A
hbwhelp@micrel.com or (408) 955-1690
3
Evaluation Board
SY89467U AC-Coupled Evaluation Board
I/O Power Supply V
CC
GND V
EE
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 2.0V 0V -0.5V
AC-Coupled Input/DC-Coupled Output 3.3V 2.0V 0V -1.3V
Table 1. SY89467U AC-Coupled Evaluation Board Power Supply Connections

Especificaciones del producto

Marca: Microchip
Categoría: No categorizado
Modelo: SY89467/468U

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