Microchip SY54020AR/R Manual

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Side 1/7

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-

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

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	SY54020AR/R

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