Microchip SY54017A Handleiding

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SY54017R/AR Evaluation Board

Low Voltage 1.2V/1.8V CML Differential

2:1 MUX (with FAIL SAFE INPUTS)

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

June 2008 M9999-062008-A

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

General Description

The SY54017R and SY54017AR 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

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

• SY54017R/AR 1.2V/1.8V CML outputs

• Single +2.5V VCC with 1.2V/1.8V 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

• SY54017R Low Voltage 1.2V/1.8V CML Differential 2:1

MUX with Fail Safe Inputs Datasheet

• SY54017AR Low Voltage 1.2V/1.8V CML Differential 2:1

MUX Datasheet

___________________________________________________________________________________________________________

Evaluation Board

Micrel, Inc. SY54017R/AR Evaluation Board

June 2008 2 M9999-062008-A

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

Evaluation Board Description

The SY54017R and SY54017AR share a common

evaluation board. The boards are 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 two

configurations, AC-Coupled or DC-Coupled, offers the

user flexibility in selecting the board that is right for his

particular 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.

SY54017R/AR 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 both the 1.2V

and 1.8V configuration 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 for a DC supply to 2.5V and

turn off the supply.

2. Set the voltage setting for a second DC supply to be

either 1.2V or 1.8V and turn off the supply.

3. Connect the negative terminal of the two power

supplies together and connect to the VEE terminal of

the evaluation board.

4. Do not earth ground either supply.

5. Turn on the power supplies and verify that the 2.5V

supply current is <35mA and 1.2V/1.8V supply is

<25mA.

6. 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 100mV and 1.0V.

2. Using equal length 50Ω impedance coaxial cables,

connect the signal source to the desired input (Pin 1

and Pin 16 for IN0; Pin 4 and Pin5 for IN1). The

desired input needs to be selected through the SEL

pin (Pin 15), which is connected to the J13 jumper.

Please refer to Table 1 below for proper selection of

input.

3. If an external clock signal is used to drive the SEL

pin for testing purposes, please add a 50Ω resistor

to R5 in order to terminate the trace. In addition,

remove R7.

SEL/J13 OUTPUT

0 IN0 Input Selected

1 IN1 Input Selected

Table 1. Truth Table

Setting up the DC-Coupled Output

1. Using equal length 50Ω impedance coaxial cables

connect the SMA outputs of the evaluation board

(Pin 10 and Pin 11 for Q) 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.

2. Turn on the power supplies and verify that the 2.5V

supply current is <35mA and 1.2V/1.8V supply is

<25mA.

3. Enable the signal source and monitor the outputs.

Micrel, Inc. SY54017R/AR Evaluation Board

June 2008 3 M9999-062008-A

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

Evaluation Board

SY54017R and SY54017AR 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

Table 2. SY54017R/AR AC-Coupled Evaluation Board Power Supply Connections

Product specificaties

Merk:	Microchip
Categorie:	Niet gecategoriseerd
Model:	SY54017A

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