Instrukcja obsługi Microchip SY89311U

Microchip nieskategoryzowany SY89311U

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August 2004 M9999-081304
hbwhelp@micrel.com or (408) 955-1690
1:2 Differential PECL/LVPECL/ECL
Fanout Buffer
SY89311U Evaluation Board
General Description
The SY89311U evaluation board is designed for
convenient setup and quick evaluation of the
SY89311U. It allows the user to evaluate the part
over the full voltage range of the part.
The evaluation board standard configuration is AC-
coupled for direct interface to a 50Ω compatible
oscilloscope without split supplies. For applications
that require a DC-coupled configuration, step-by-step
instructions for modifying the board are included.
The board is fully assembled and tested and is
accompanied with all necessary documentation.
Data sheets and support documentation can be found
on Micrel’s web site at www.micrel.com.
Features
• SY89311U
• Single +2.5V, +3.3V or +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
• SY89311U, 2.5V/3.3V/5V 1:2 Differential
PECL/LVPECL/ECL Fanout Buffer Data Sheet
____________________________________________________________________________________
Evaluation Board
Micrel Evaluation Board SY89311U
August 2004 M9999-081304
hbwhelp@micrel.com or (408) 955-1690
2
Evaluation Board Description
The SY89311U evaluation board is initially configured
for +3.3V operation. The board can be easily modified
for +2.5V or +5V operation.
The default configuration for the board 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 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, making it
unnecessary to vary the offset voltage or change any
components on the board as the power supply
voltage varies over the +3.3V +10% operating range.
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.
To modify the +3.3V AC-coupled evaluation board
into a +2.5V or +5V AC-coupled evaluation board,
resistor values for R9, R10, R11 and R12 at the
inputs and R2, R4, R6 and R8 at the outputs need to
be changed as shown in the following table.
VCC
R2-R8
R9/R11
R10/R12
2.5V
82Ω
104Ω
96Ω
3.3V
82Ω
82Ω
130Ω
5.0V
180Ω
68Ω
192Ω
Table 1. Resistor Values
DC-Coupled Evaluation Board
For DC-coupled operation, the board 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, the
+2.5V supply is split into a +2V and –0.5V, or for a
+5V supply it is split into a +2V and –3V 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 VCC supply. The
VEE voltage is then set to the appropriate negative
voltage so the device power pins still see a full 2.5V,
3.3V or 5V potential between VCC and VEE.
Step-by-step instructions for modifying an AC-coupled
evaluation board for DC-coupled operation are
supplied in the “Modifying your AC-Coupled Board for
DC-Coupled Operation” section.
Micrel Evaluation Board SY89311U
August 2004 M9999-081304
hbwhelp@micrel.com or (408) 955-1690
3
AC-Coupled Evaluation Board
(Default +3.3V Configuration)
Power Supply
VCC
GND
VEE
2.5V System
+2.5V
0V
0V
3.3V System
+3.3V
0V
0V
5V System
+5V
0V
0V
Table 1. AC-Coupled Evaluation Board Power Supply Connections

Specyfikacje produktu

Marka: Microchip
Kategoria: nieskategoryzowany
Model: SY89311U

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