Microchip SY58602U Bedienungsanleitung
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SY58602U
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Ultra-Precision Differential CML and LVPECL
Line Driver/Receiver w/Internal Termination
SY58600/601/602U Evaluation Board
September 2004 M9999-092904
hbwhelp@micrel.com or (408) 955-1690
General Description
The SY58600U, SY58601U and SY58602U
evaluation boards are designed for convenient set-up
and quick evaluation of the respective devices. They
allow the user to evaluate the part over the full
voltage-range of the parts without requiring any
modifications to the board.
The evaluation board standard configuration is AC-
coupled for direct interface to a 50 compatible
oscilloscope without split supplies. 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 at Micrel’s web site at www.micrel.com.
.
Features
• SY58600U CML outputs
• SY58601U and SY58602U LVPECL outputs
• Single +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
• Reconfigurable for DC-coupled operation
Related Documentation
• SY58600U Ultra-Precision Differential 400mV
CML Line Driver/Receiver with Internal
Termination Data Sheet
• SY58601U Ultra-Precision Differential 800mV
LVPECL Line Driver/Receiver with Internal
Termination Data Sheet
• SY58602U Ultra-Precision Differential 400mV
LVPECL Line Driver/Receiver with Internal
Termination Data Sheet
____________________________________________________________________________________
Evaluation Board
SY58600U AC-Coupled Evaluation Board
SY58601U/602U AC-Coupled Evaluation Board
Micrel
SY58600/601/602 Evaluation Board
September 2004
M9999-092904
hbwhelp@micrel.com or (408) 955-1690
2
Evaluation Board Description
The SY58600U, SY58601U and SY58602U share a
common evaluation board. The individual evaluation
boards are labeled to identify the specific device and
the configuration, either AC-coupled or DC-coupled
configuration, for that board. The SY58600U is a
CML-output evaluation board and the SY58601U and
SY58602U are identical LVPECL-output evaluation
boards.
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 his 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 of either +2.5V +5% or +3.3V
+10% and offers the most flexibility in interfacing to a
variety of signal sources.
The 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. 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 Boards
SY58600U 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 to
GND termination, the power supplies are configured
to offset the voltage of the evaluation board to be
negative. For a 2.5V configuration the V
CC
and GND
of the board are set to 0V and the V
EE
is set to –2.5V.
For a 3.3V configuration the V
CC
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 V
CC
for the CML output drivers.
SY58601U/SY58602U 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 section “Modifying your AC-Coupled
Board for DC-Coupled Operation.”
Produktspezifikationen
| Marke: | Microchip |
| Kategorie: | Nicht kategorisiert |
| Modell: | SY58602U |
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