Analog Devices EVAL-ADG2108EBZ Manual de usuario

EVAL-ADG2108EBZ User Guide

UG-465

One Technology Way •P. O. Box 9106 •Norwood, MA 02062-9106, U.S.A. •Tel: 781.329.4700 •Fax: 781.461.3113 •www.analog.com

Evaluation Board for the ADG2108 I2C CMOS 8 × 10 Analog Switch Array with

Dual/Single Supplies

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS. Rev. B | Page 1 of 12

FEATURES

Full-featured evaluation board for the ADG2108

Various link options

Direct hook up to the USB port of a PC

PC software for control of switches

Functions with or without a PC

GENERAL DESCRIPTION

This document describes the evaluation board for the ADG2108

I2C, CMOS, 8 × 10 analog switch array with dual/single supplies.

The array is bidirectional, and, as a result, its rows and columns

can be configured as either inputs or outputs. Any number of

combinations can be active at one time.

The ADG2108 has a maximum difference of 15 V between its

inputs, VDD and VSS. Therefore, care must be taken not to exceed

this parameter when connecting the power supplies.

The evaluation board interfaces to the USB port of a PC.

Software is available with the evaluation board that allows the

user to easily program the ADG2108. The EVAL-ADG2108EBZ

can also be used as a standalone board.

Complete specifications for the ADG2108 are available in the

ADG2108 data sheet, available from Analog Devices, Inc., which

should be consulted in conjunction with this user guide when

using the evaluation board.

EVALUATION BOARD BLOCK DIAGRAM

Figure 1.

3.3V

LINEAR

REGULATOR

POWER SUPPLY INPUTS

ADG2108

CMOS ANALOG

SWITCH ARRAY

RESET

CONTROLLER

CY7C68013

USB

CONNECTOR

I/O

X0 X9

I/O

SCL

SDA

GND V

VBUS

DGND

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UG-465 EVAL-ADG2108EBZ User Guide

Rev. B | Page 2 of 12

TABLE OF CONTENTS

Features .............................................................................................. 1

General Description......................................................................... 1

Evaluation Board Block Diagram................................................... 1

Revision History ............................................................................... 2

Evaluation Board Hardware............................................................ 3

Power Supplies .............................................................................. 3

Link Options ................................................................................. 3

Evaluation Board Software Quick Start Procedures.....................5

Software Installation .....................................................................5

Software Operation.......................................................................5

Evaluation Board Schematics and Artwork...................................7

Ordering Information.................................................................... 11

Bill of Materials........................................................................... 11

REVISION HISTORY

3/16—Rev. A to Rev. B

Changed EVAL-ADG2108EB to EVAL-ADG2108EBZ.....Universal

Deleted Installing the Software Section..............................................5

Added Software Installation Section and Reinitialize Software

Section ......................................................................................................5

Changes to Software Operation Section, Figure 2, Figure 3,

Setting the I2C Address Section, and Figure 4...................................5

Changes to Load Switch (LDSW) Section, Switch Status Section,

Figure 5, and RESET Function Section..............................................6

Added All On Function Section ..........................................................6

8/12—Rev. 0 to Rev. A

Document Title Changed from EVAL-ADG2108EB

to UG-465............................................................................Universal

Updated Format..................................................................Universal

Changes to Figure 6.......................................................................... 8

Changes to Table 4.......................................................................... 11

5/06—Revision 0: Initial Version

EVAL-ADG2108EBZ User Guide UG-465

Rev. B | Page 3 of 12

EVALUATION BOARD HARDWARE

POWER SUPPLIES

The EVAL-ADG2108EBZ can be operated with both single and

dual supplies. The device is specified to operate in single-supply

mode at 12 V ± 10% and at 8 V ± 10% operation. It is also

specified to operate at ±5 V dual supply. To apply these supplies

to the evaluation board, the following guidelines apply:

VLprovides the digital supply for the ADG2108 and all

digital circuitry on the board. This supply can be applied

externally, or the USB port can be used to power the digital

circuitry (Link 5 inserted). Note that in this case, the logic

supply power is 3.3 V.

The positive supply voltage (for example, 8 V/12 V) is

applied between the AVDD and AGND inputs of the

ADG2108 evaluation board. Note that the maximum

single supply the chip can handle is 15 V. In this case,

AVSS must equal 0 V.

The negative supply (for example, −5 V) is applied between

AVSS and AGND inputs for the negative supply (VSS) of

the ADG2108. Note that the maximum voltage between

AVDD and AVSS is 15 V.

Both analog GND and digital GND inputs are provided on the

board. The AGND and DGND planes are connected at one

location close to the ADG2108. It is recommended not to

connect AGND and DGND elsewhere in the system to avoid

ground loop problems.

Each supply is decoupled to the relevant ground plane with

10 μF and 0.1 μF capacitors. Each device supply pin is also

decoupled with a 10 μF and 0.1 μF capacitor pair to the relevant

ground plane.

LINK OPTIONS

There are a number of links and switch options on the evaluation

board that must be set for the required operating setup before

using the board. The functions of these link options are described

in Table 1.

Table 1. Link Functions

Link No. Function

LK1 This link chooses the LSB bit of the chip address on the USB I2C interface. Note that the I2C address must be set before the

evaluation board software is launched.

When inserted, the address bit is set to 0.

When removed, the address bit is set to 1.

LK2 This link chooses the second LSB bit of the chip address on the USB I2C interface. Note that the I2C address must be set before

the evaluation board software is launched.

When inserted, the address bit is set to 0.

When removed, the address bit is set to 1.

LK3 This link chooses the third LSB bit of the chip address on the USB I2C interface. Note that the I2C address must be set before the

evaluation board software is launched.

When inserted, the address bit is set to 0.

When removed, the address bit is set to 1.

LK4 This link selects whether the supply at VSS is sourced from ground or from the input AVSS. If sourced from ground, it is a single-

supply system.

Position A: VSS sourced from AVSS.

Position B: VSS is connected to ground. This implies single-supply operation of the ADG2108.

LK5 This link selects whether the logic supply power comes from the USB power (if connected to a PC) or from the user supplied VL

(if used as a standalone unit).

When inserted, logic power supply comes from USB power, that is, 3.3 V.

When removed, logic power supply comes from user supplied VL.

UG-465 EVAL-ADG2108EBZ User Guide

Rev. B | Page 4 of 12

Setup for PC Control

The default setup for the EVAL-ADG2108EBZ is for control by

the PC via the USB port. The default link options are listed in

Table 2.

Table 2. Default Link Options

Link No. Option

LK1 Inserted; therefore, the LSB is 0.

LK2 Inserted; therefore, the second LSB is 0.

LK3 Inserted; therefore, the third LSB is 0.

LK4 Position A; therefore, AVSS is supplying the power to VSS.

LK5 Inserted; therefore, logic power supply comes from

USB power.

Setup for Control Without a PC

The EVAL-ADG2108EBZ can also be used as a standalone

board. This option is designed for users with a PC without a

USB port or for users wishing to hook the board up to their

entire system. Table 3 lists the link options that must be set to

operate the evaluation board in this way.

Table 3. Link Options Setup for Control Without a PC

Link No. Option

LK1 User configurable. Does not affect whether the

board is connected to a PC or not.

LK2 User configurable. Does not affect whether the

board is connected to a PC or not.

LK3 User configurable. Does not affect whether the

board is connected to a PC or not.

LK4 Position A.

LK5 Removed.

SMB connectors are provided for the SDA and SCL inputs.

Switches are turned on and off via this I2C bus. The read/write

procedures are also provided in the ADG2108 data sheet and

should be consulted when using this evaluation board in its

standalone mode.

EVAL-ADG2108EBZ User Guide UG-465

Rev. B | Page 5 of 12

EVALUATION BOARD SOFTWARE QUICK START PROCEDURES

The ADG2108 evaluation kit includes software on the CD-ROM.

The evaluation software must be installed before connecting the

evaluation board to the USB port of the PC to ensure that the

evaluation board is correctly recognized when connected to the PC.

SOFTWARE INSTALLATION

To install t he software,

1. Start the PC and insert the CD. The installation software

should launch automatically. If it does not, use Windows®

Explorer to locate the file setup.exe on the CD. Double-

click this file to start the installation procedure.

2. At the prompt, select a destination directory. By default,

it is C:\Program Files\Analog Devices\ADG2108.

After the directory is selected, the installation procedure

copies the files into the relevant directories on the hard

drive. The installation program creates a program group

called Analog Devices with a subgroup called ADG2108

in the Start menu of the taskbar.

3. After the installation of the evaluation software is

complete, a welcome window displays for the installation

of the ADI PAD Drivers. Click Install to install the

drivers.

4. After the installation of the drivers, power up the

ADG2108 evaluation board as described in the Power

Supplies section. Then, connect the board to the USB port

of the PC using the supplied cable.

SOFTWARE OPERATION

To launch the software, click Start > All Programs > Analog

Devices > ADG2108 > ADG2108 Evaluation Software. The

Configuration tab of the evaluation software then displays as

shown in Figure 2.

Figure 2. Configuration Tab

If the ADG2108 evaluation board is not connected to the USB

port when the software is launched, a Hardware Select dialog

box displays (shown in Figure 3). Connect the evaluation board

to the USB port of the PC, wait for a few seconds, click Rescan,

and then click Select. The Configuration tab of the evaluation

software then displays, as shown in Figure 2.

Figure 3. Hardware Select Dialog Box

Reinitialize Software

Click Reinitialize Software in the Configuration tab to reset

the software to its default state. Reinitialize the software

whenever the evaluation board is reconnected to the PC;

otherwise, a new evaluation board is used.

Setting the I2C Address

The device address can be set in the Device Address tab (shown

in Figure 4).

Figure 4. Device Address Tab

Set the device address by clicking the relevant bit. Remember

to click Set Device Address to update the device address in

the software. Note that the address set must correspond to the

address set with the jumpers on the evaluation board; the

address must be set before the evaluation board software works.

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UG-465 EVAL-ADG2108EBZ User Guide

Rev. B | Page 6 of 12

Load Switch (LDSW)

If the load switch function in the Configuration tab is on, the

switches can be updated simultaneously (as an example, for the

RGB colors in video switching). Otherwise, if the load switch is

off, the switch condition updates upon completion of each I2C

write, that is, immediately upon clicking an LED in Analog

Crosspoint Switch Control in the Configuration tab. The LED

is green when the switch is on and black when the switch is off.

If the load switch is on, clicking an LED in Analog Crosspoint

Switch Control stores the switch status temporarily until

Update Switches is clicked. When an LED is clicked, a red LED

indicates that the switch is to be turned on and a dark green

LED indicates that the switch is to be turned off. All switches

are then updated simultaneously upon clicking Update

Switches. The red LEDs then become green and the dark green

LED becomes black, indicating that the switches are now on

and off, respectively.

Switch Status

To see what the status of the switch array is at any given time,

click the Switch Status tab (shown in Figure 5). The green LED

in the Analog Crosspoint Switch Status indicates that the switch

is on and the black LED indicates that the switch is off.

Figure 5. Switch Status Tab

RESET Function

There is a RESET button on the board (see RESET on the

schematic) that can be used to reset the switch array. Alternatively,

clicking Reset All (Off) in the Configuration tab of the software

resets all switches.

All On Function

Clicking All On in the Configuration tab of the software turns

on all of the switches.

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EVAL-ADG2108EBZ User Guide UG-465

Rev. B | Page 7 of 12

EVALUATION BOARD SCHEMATICS AND ARTWORK

Figure 6. Schematic of USB Controller Circuitry

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UG-465 EVAL-ADG2108EBZ User Guide

Rev. B | Page 8 of 12

Figure 7. Schematic of ADG2108 Circuitry

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EVAL-ADG2108EBZ User Guide UG-465

Rev. B | Page 9 of 12

Figure 8. Component Placement Drawing

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UG-465 EVAL-ADG2108EBZ User Guide

Rev. B | Page 10 of 12

Figure 9. Component Side PCB Drawing

Figure 10. Solder Side PCB Drawing

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