Microchip SY56011R Manual

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Side 1/7

SY56011R Evaluation Board

Low Voltage 1.2V/1.8V/2.5V 6.4Gbps CML

1:2 Fanout Buffer with Input Equalization

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

November 2008 M9999-110408-B

hbwhelp@micrel.com or (408) 955-1690

General Description

The SY56011R evaluation board is designed for

convenient set-up and quick evaluation. It allows the user

to evaluate the part 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

• SY56011R 1.2V/1.8V/2.5V CML outputs

• 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

• SY56011R Low Voltage 1.2V to 2.5V CML Differential

1:2 Fanout Buffer with Input Equalization

___________________________________________________________________________________________________________

Evaluation Board

Micrel, Inc. SY56011R Evaluation Board

November 2008 2 M9999-110408-A

hbwhelp@micrel.com or (408) 955-1690

Evaluation Board Description

The SY56011R evaluation board is designed to accept

either AC-coupled or DC-coupled inputs. 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 choice between 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.

SY56011R AC-Coupled Evaluation Board

(AC-Coupled Input, DC-Coupled Output)

For a 1.2V output configuration, 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 <90mA and 1.2V/1.8V/2.5V supply

is <50mA. If using one supply, <140mA.

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 differential 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

inputs 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 desired attenuation

line and then connect to the input on the evaluation

board. Make sure the length of each attenuation line

is matched to each other.

3. The equalization can be selected through the EQ pin

(Pin 6), which is connected to the J10 jumper. The

EQ setting depends on the length of the attenuation

line. Please refer to Table 1 below for the desired

equalization selection.

EQ FR4 EQUALIZATION

LOW( L) 9”

FLOAT 18”

HIGH( H) 27”

Table 1. EQ Setting

Setting up the DC-Coupled Output

1. Using equal length 50Ω impedance coaxial cables

connect the SMA outputs of the evaluation board to

the oscilloscope or other measurement device that

has an internal DC-Coupled 50Ω termination. If only

one output is connected to the oscilloscope, the

complementary output must still be terminated with a

50Ω termination. The second output pair also needs

to be terminated into 50Ω

2. Turn on the power supplies and make sure the

current does not exceed the specifications above. If

shorted, check system ground.

3. Enable the signal source and monitor the outputs.

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	SY56011R

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