Microchip SY54020AR/R Handleiding

Microchip Niet gecategoriseerd SY54020AR/R

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SY54020AR/R Evaluation Board
Low Voltage 1.2V/1.8V/2.5V CML
Differential 1:4 Fanout Buffer with /Enable
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
March 2009 M9999-033109-A
hbwhelp@micrel.com or (408) 955-1690
General Description
The SY54020AR/R evaluation board is designed for
convenient set-up and quick evaluation. It allows the user
to evaluate the device over the full voltage range of the
part without requiring any modification to the board.
The evaluation board standard configuration is AC-coupled
inputs with DC-coupled outputs for direct interface to a
50Ω-compatible oscilloscope. 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 at
Micrel’s web site at: www.micrel.com.
Features
• SY54020AR/R 1.2V/1.8V/2.5V CML outputs
• Synchronous output enable (/EN)
• SY54020R also has fail-safe input
• Single 2.5V VCC with 1.2V/1.8V/2.5V VCCO supply
• AC-coupled configuration for ease-of-use
• I/O interface includes on-board termination
• Fully assembled and tested
• Reconfigurable for DC-coupled operation
Applications
• Clock and data distribution
___________________________________________________________________________________________________________
Evaluation Board
Micrel, Inc. SY54020AR/R Evaluation Board
March 2009 2 M9999-033109-
A
hbwhelp@micrel.com or (408) 955-1690
Evaluation Board Description
The SY54020AR/R evaluation board is designed to
accept either AC-coupled or DC-coupled inputs;
however, all boards are shipped with DC-coupled
outputs. The DC-coupled outputs allow the CML output
to be connected directly to a scope with the standard
termination of 50Ω-to-ground. This is accomplished by
tying the body of the SMA connectors to the VCCO supply
on the evaluation board so that the scope termination
appears as 50Ω-to-VCCO on the board. This allows the
body of the SMA connectors, which are scope GND, to
appear at the same potential as VCCO for the CML output
drivers.
The default configuration for the boards is AC-coupled
inputs and DC-coupled outputs and all boards are
shipped with this configuration. The choice between the
two configurations, AC-coupled or DC-coupled inputs,
offers the user flexibility in selecting the board that is
right for the given application.
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.”
If the output is connected to an AC-coupled 50Ω
termination, the 1.2V operation may not work due to a
200mV output level shift from the output coupling
capacitors.
SY54020AR/R AC-Coupled Evaluation Board
(AC-Coupled Input, DC-Coupled Output)
For a 1.2V output conguration, the V CC of the board is
set to 2.5V and the VCCO is set to 1.2V. For a 1.8V output
configuration, the VCCO is set to 1.8V. For a full 2.5V
operation, short VCCO to VCC. For all configurations, the
VEE is set to 0V.
Setting up the AC-Coupled Evaluation Board
(AC-Coupled Input, DC-Coupled Output)
The following steps describe the procedure for setting up
the CML-output evaluation board:
Setting up the Power Supplies:
1. Set the voltage setting of a DC supply to 2.5V and
turn off the supply.
2. Set the voltage setting for a second DC supply to be
1.2V, 1.8V or 2.5V and turn off the supply.
3. 2.5V output operation can also be achieved by
shorting VCCO to VCC and operating with one supply.
4. Connect the negative terminal of the two power
supplies together and connect to the VEE terminal of
the evaluation board.
5. Do not earth ground either supply.
6. Turn on the power supplies and verify that the 2.5V
supply current is <70mA and 1.2V/1.8V/2.5V supply
is <90mA. If using one supply, <160mA.
7. Turn off the power supplies.
Setting up the AC-Coupled Input
1. Using a differential signal source set the HIGH level
of each side of the dierential pair to be 0.4V and
the LOW level to be 0V. Note that for AC-coupled
inputs, only the signal swing is significant, since the
input will be re-biased after the series capacitor. The
amplitude of the input swing can be any value
between 200mV and 1.0V.
2. Using equal length 50Ω impedance coaxial cables,
connect the signal source to the input, IN and /IN, on
the evaluation board. Make sure the length of each
line is matched to each other.
3. The /Enable input (Pin 4) is LOW by default and can
be left floating for normal operation. To disable the
output, this pin can be tied HIGH.
Setting up the DC-Coupled Output
1. Using equal length 50Ω impedance coaxial cables,
connect one of the SMA output pairs of the
evaluation board to the oscilloscope or other
measurement device that has an internal DC-
coupled 50Ω termination. If only one true output is
connected to the oscilloscope, the complementary
output must still be terminated with a 50Ω
termination. Terminate all unused outputs into 50Ω.
Otherwise, reflections will distort the waveform being
monitored.
2. Turn on the power supplies and verify that the 2.5V
supply current is <70mA and 1.2V/1.8V/2.5V supply
is <90mA. And <160mA if using one supply.
3. Enable the signal source and monitor the output
Micrel, Inc. SY54020AR/R Evaluation Board
March 2009 3 M9999-033109-
A
hbwhelp@micrel.com or (408) 955-1690
Evaluation Board
SY54020AR/R AC-Coupled Evaluation Board
Power Supply VCC VCCO VEE I/O
1.2V Output 2.5V 1.2V 0V AC-Coupled Input/DC-Coupled Output
1.8V Output 2.5V 1.8V 0V AC-Coupled Input/DC-Coupled Output
2.5V Output 2.5V 2.5V 0V AC-Coupled Input/DC-Coupled Output
Table 2. SY54020AR/R AC-Coupled Evaluation Board Power Supply Connections

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: SY54020AR/R

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