Analog Devices EVAL-AD7903SDZ Manual de usuario

EVAL-AD7903SDZ User Guide

UG-609

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

Evaluating the AD7903 Dual Differential, 16-Bit, 1 MSPS PulSAR ADC

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 32

FEATURES

Full featured evaluation board for the AD7903

Versatile analog signal conditioning circuitry

On-board reference, reference buffers, and ADC drivers

System demonstration board compatible (EVAL-SDP-CB1Z)

PC software for control and data analysis of time and

frequency domain

EVALUATION KIT CONTENTS

EVAL-AD7903SDZ evaluation board

Wall power supply 9 V dc adapter

Daughter card power connector

ADDITIONAL EQUIPMENT/SOFTWARE NEEDED

System demonstration platform (EVAL-SDP-CB1Z)

Precision analog signal source

Power supply, +7 V/−2.5 V (optional)

USB cable

SMA cable

PC running Windows XP SP2, Windows Vista, Windows 7, or

higher with USB 2.0 port

Evaluation software for the AD7903 (download from

AD7903 product page)

ONLINE RESOURCES

Documents Needed

AD7903 data sheet

EVAL-AD7903SDZ user guide

Required Software

EVAL-AD7903SDZ evaluation software

FAQs and Troubleshooting

TYPICAL SETUP

Figure 1. Typical Setup for the EVAL-AD7903SDZ

(EVAL-AD7903SDZ on Left and EVAL-SDP-CB1Z on Right)

SIGNALSOURCE

SMA

CONNECTOR

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TABLE OF CONTENTS

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

Evaluation Kit Contents................................................................... 1

Additional Equipment/Software Needed ...................................... 1

Online Resources.............................................................................. 1

Typical Setup ..................................................................................... 1

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

General Description......................................................................... 3

Getting Started.................................................................................. 4

Software Installation Procedures................................................ 4

Evaluation Board Setup Procedures........................................... 7

Evaluation Board Hardware............................................................ 8

Device Description....................................................................... 8

Power Supplies .............................................................................. 8

Link Configuration Options ......................................................... 10

Evaluation Board Circuitry ........................................................... 11

Analog Inputs.............................................................................. 11

Reference ..................................................................................... 11

Serial Interface ............................................................................ 11

Modes of Operation ....................................................................... 12

SDP Controlled Mode ............................................................... 12

Standalone Mode........................................................................ 12

How to Use the Software ............................................................... 13

Setting Up the System for Data Capture:

Board Operation/Connection Sequence................................. 13

Starting the Software.................................................................. 13

Overview of the Main Window................................................ 15

Generating a Waveform Analysis Report................................ 16

Generating a Histogram of the ADC Code Distribution ..... 17

Generating a Fast Fourier Transform of AC Characteristics ......18

Generating a Summary of the Waveform, Histogram, and

Fast Fourier Transform.............................................................. 19

Evaluation Board Schematics and Artwork................................ 20

EVAL-AD7903SDZ Schematics ............................................... 20

EVAL-AD7903SDZ Layout....................................................... 25

Bill of Materials............................................................................... 28

Related Links................................................................................... 30

REVISION HISTORY

1/14—Revision 0: Initial Version

EVAL-AD7903SDZ User Guide UG-609

Rev. 0 | Page 3 of 32

GENERAL DESCRIPTION

The E VA L -AD7903SDZ is an evaluation board designed to

demonstrate the low power AD7903 performance and to

provide an easy to understand interface for a variety of system

applications. The AD7903 is a dual differential 16-bit, 1 MSPS

PulSAR® ADC. A full description of the AD7903 is available in

the AD7903 data sheet and should be consulted when using this

evaluation board.

The evaluation board is ideal for use with the Analog Devices, Inc.,

system demonstration platform (SDP) board, E VA L -SDP-CB1Z.

The evaluation board interfaces to the SDP board via a 120-pin

connector. SMA Connectors J6, J7, J10, and J15 are provided to

connect a low noise analog signal source.

The user PC software executable controls the evaluation board

over the USB through the SDP board, EVA L -SDP-CB1Z.

On-board components include the following:

ADR435: high precision, buffered band gap 5.0 V reference

AD8031: reference buffer

ADA4841-1: signal conditioning circuit with op amps

ADP7104 and ADP2301: regulators to derive necessary voltage

levels on board

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GETTING STARTED

SOFTWARE INSTALLATION PROCEDURES

The evaluation board software can be downloaded from the

AD7903 product page on the Analog Devices website, at

www.analog.com.

There are two parts to the installation:

•AD7903 evaluation board software installation

•E VA L-SDP-CB1Z system demonstration platform board

drivers installation

Warning

The evaluation board software and drivers must be installed

before connecting the evaluation board and E VA L -SDP-CB1Z

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

system is correctly recognized when it is connected to the PC.

Installing the AD7903 Evaluation Board Software

To install the AD7903 evaluation board software,

1. Start the Windows operating system and download the

software from the AD7903 product page on the Analog

Devices website, at www.analog.com.

2. Unzip the downloaded file.

3. Double-click the setup.exe file to begin the evaluation

board software installation (see Figure 2).

Figure 2. AD7903 Evaluation Board Software Installation: Installation Begins

4. Select the location to install the software, and then click

Next. (The default location is C:\Program Files (x86)\

Analog Devices\AD7902_03 Evaluation Software\.

This location also contains the executable software and

example files.)

Figure 3. AD7903 Evaluation Board Software Installation:

Selecting the Location for Software Installation

(the Default Location Is Shown)

5. A license agreement appears. Read the agreement, and then

select I accept the License Agreement and click Next.

Figure 4. AD7903 Evaluation Board Software Installation:

Accepting the License Agreement

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EVAL-AD7903SDZ User Guide UG-609

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6. A summary of the installation is displayed. Click Next to

continue.

Figure 5. AD7903 Evaluation Board Software Installation:

Reviewing a Summary of the Installation

7. A dialog box shows the installation progress.

Figure 6. AD7903 Evaluation Board Software Installation:

Displaying Installation Progress

8. The dialog box informs you when the installation is

complete. Click Next.

Figure 7. AD7903 Evaluation Board Software Installation:

Indicating When the Installation Is Complete

9. The setup for the installation of the E VA L-SDP-CB1Z

system demonstration platform board drivers auto-

matically begins to load.

Figure 8. Loading the Setup for SDP Drivers Installation

Installing the EVAL-SDP-CB1Z System Demonstration

Platform Board Drivers

After the installation of the evaluation board software is complete,

a welcome window is displayed for the installation of the E VA L -

SDP-CB1Z system demonstration platform board drivers.

1. Make sure that all other applications are closed, and then

click Next.

Figure 9. EVAL-SDP-CB1Z Drivers Setup:

Beginning the Drivers Installation

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2. Select the location to install the drivers, and then click Install.

Figure 10. EVAL-SDP-CB1Z Drivers Setup:

Selecting the Location for Drivers Installation

3. Installation of the SDP drivers begins.

Figure 11. EVAL-SDP-CB1Z Drivers Setup:

Beginning the Installation

4. A dialog box appears asking whether you would like to

install this device software. Click Install to confirm that

you would like to install the drivers.

Figure 12. EVAL-SDP-CB1Z Drivers Setup:

Granting Permission to Install Drivers

5. To complete the drivers installation, click Finish, which

closes the installation wizard.

Figure 13. EVAL-SDP-CB1Z Drivers Setup:

Completing the Drivers Setup Wizard

6. Before using the evaluation board, you must restart your

computer. A dialog box opens, giving you the following

options: Restart, Shut Down, Restart Later. Click the

appropriate button.

Figure 14. EVAL-SDP-CB1Z Drivers Setup:

Restarting the Computer

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EVAL-AD7903SDZ User Guide UG-609

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EVALUATION BOARD SETUP PROCEDURES

The AD7903 evaluation board connects to the (E VA L -SDP-CB1Z)

system demonstration board. The E VA L-SDP-CB1Z board is

the controller board, which is the communication link between

the PC and the main evaluation board.

Figure 1 shows a photograph of the connections made between

the E VA L -AD7903SDZ daughter board and the E VA L -SDP-CB1Z

motherboard.

Connecting the Evaluation and SDP Boards to a PC

1. Install the AD7903 software. Ensure that the E VA L -SDP-CB1Z

board is disconnected from the USB port of the PC while

installing the software. The PC must be restarted after the

installation is complete.

2. Before connecting power, connect the 120-pin connector, J5,

of the E VA L -AD7903SDZ board to Connector J4 on the

E VA L-SDP-CB1Z board. Nylon screws are included in the

E VA L-AD7903SDZ evaluation kit and can be used to

ensure that the E VA L -AD7903SDZ and E VA L -SDP-CB1Z

boards are connected firmly together.

3. Connect the 9 V power supply adapter included in the kit

to the E VA L -SDP-CB1Z.

4. Connect the E VA L -SDP-CB1Z board to the PC via the

USB cable. (If you are using Windows® XP, you may need to

search for the E VA L -SDP-CB1Z drivers. Choose to auto-

matically search for the drivers for the E VA L -SDP-CB1Z

board if prompted by the operating system.)

Verifying the Board Connection

1. Allow the Found New Hardware Wizard to run after the

E VA L-SDP-CB1Z board is plugged into your PC. (If you

are using Windows XP, you may need to search for the

E VA L-SDP-CB1Z drivers. Choose to automatically search

for the drivers for the EVA L -SDP-CB1Z board if prompted

by the operating system.)

2. Check that the board is connected to the PC correctly

using the Device Manager of the PC.

a. Access the Device Manager as follows:

i. Right-click My Computer and then click Manage.

ii. A dialog box appears asking for permission to

allow the program to make changes to your

computer. Click Ye s .

iii. The Computer Management box appears. From

the list of System To ols, click Device Manager.

b. Under ADI Development Tools, Analog Devices

System Development Platform SDP-B should appear

(see Figure 15), indicating that the E VA L -SDP-CB1Z

driver software is installed and that the board is

connected to the PC correctly.

Figure 15. Device Manager:

Checking that the Board Is Connected to the PC Correctly

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EVALUATION BOARD HARDWARE

DEVICE DESCRIPTION

The AD7903 is a 16-bit, 1 MSPS, precision, power efficient, dual

differential PulSAR ADC that uses SAR-based architecture and

does not exhibit any pipeline delay or latency. The AD7903 is

specified for use with a single supply of 2.5 V (VDD1, VDD2).

The interface from the digital host to the AD7903 uses 1.8 V/

2.5 V/3.3 V/5.5 V logic. The AD7903 is compatible with the

SPI/QSPI/MICROWIRE/DSP serial interface to transfer data

conversions. Complete AD7903 specifications are provided in

the AD7903 data sheet and should be consulted in conjunction

with this user guide when using the evaluation board. Full

details on the E VA L -SDP-CB1Z are available on the Analog

Devices website, at www.analog.com.

Figure 26 to Figure 31 show the evaluation board schematics.

The board consists of an AD7903 ADC (U1) with a reference

(U6—ADR435), and several ADC drivers (U12, U14, U16, and

U17—ADA4841-1YRZ). The evaluation board is a flexible

design that enables you to adjust compensation components

and operate the evaluation board from an adjustable bench top

power supply.

POWER SUPPLIES

The evaluation board can be powered from a wall adapter or

from a bench top power supply. By default, the board is set up

to operate from a 9 V wall adapter using the on-board power

supplies described in Table 1.

Table 1. Power Supplies Provided on the Board

Power Supply (V) Function Components Used

+5 SDP power ADP2301

+7.5 Positive rail ADP7104

−2.5 Negative rail ADP2301

+2.5 ADC VDD rail ADP7104

+3.3 VDRIVE (digital power) ADP7104

Each on-board power supply is decoupled where it enters the

board as well as where it connects to each device. A single ground

plane is used on this board to minimize the effect of high frequency

noise interference.

Alternatively, the board can be powered from a bench top power

supply by using the J2 and J3 screw terminals and changing the

SL1 to SL4 and LK3 to LK5 solder link settings to Position B (see

Table 2). When bench top power is used, use of the wall adapter

and the on-board power supplies are no longer required.

Table 2. Solder Links—Settings for Bench Top Power Supply1

Link Setting Function

SL1

SL2 B −VS

SL3 B −VS

SL4 B +VS

LK3 B V_SDP

LK4 B VREF

LK5 B VDD for ADC

1All other solder link settings are as described in Table 3.

EVAL-AD7903SDZ User Guide UG-609

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Figure 16. Simplified Evaluation Board Functional Block Diagram

SDP BOARD

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AD7902/AD7903 PulSAR EVALUATION BOARD

VIN1+

VIN1–

IN1+

IN1–

ADC1

–V

GND

+5V

ADSP-BF527

DSP

SPORT

SCK1

SDO1

CNV1

VIO1

SDI1

REF1

+7.5V

VDD1

ADA4841-1

A B

–2.5V

+7.5V GND

VCM

AD8031

POWER SUPPLY CIRCUITRY

ADP7104, ADP2301

= 9V

WALL ADAPTER

VDD

VSDP

GND

(OPTIONAL)

+7.5V/–2.5V 2.5V +7.5V 3.3V +5V

ADR435

GLUE

LOGIC

IN2+

IN2–

ADC2 SCK2

SDO2

CNV2

VIO2

SDI2

REF2

+7.5V VDD2

ADA4841-1

A B

–2.5V

+7.5V

GND

GLUE

LOGIC

2.5V

VIN2–

VIN2+

UG-609 EVAL-AD7903SDZ User Guide

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LINK CONFIGURATION OPTIONS

Care should be taken before applying power and signals to the

evaluation board to ensure that all link positions are as required

by the operating mode. There are two modes in which to operate

the evaluation board. The evaluation board can be operated in

SDP controlled mode to be used with the SDP board, or the

evaluation board can be used in standalone mode.

When operating in SDP controlled mode, ensure that VIO is

3.3 V. Operating with a VIO greater than 3.3 V in SDP controlled

mode may damage the SDP board.

The Default Position column of Table 3 shows the default

positions in which the links are set when the evaluation board is

packaged. When the board is shipped, it is assumed that you are

going to operate the evaluation board with the SDP board (SDP

controlled mode).

Table 3. Solder Links—Factory Default Settings

Link Setting Function Comment

SL1 A +VSChange to B if using bench supplies.

SL2 A −VSChange to B if using bench supplies.

SL3 A −VSChange to B if using bench supplies.

SL4 A +VSChange to B if using bench supplies.

SL5 A Analog input Do not alter.

SL6 A Analog input Do not alter.

LK3 A V_SDP Change to B if using bench supplies.

LK4 A VREF Change to B if using bench supplies.

LK5

for ADC

Change to B if using bench supplies.

LK6 A U12 output connects to

U14 input

Change to B if U14 inverting input needs to be connected to ground.

LK7 A U17 output connects to

U16 input

Change to B if U16 inverting input needs to be connected to ground.

LK8 A ADC2 input Change to B if using ADC1 input.

LK9 A ADC2 input Change to B if using ADC1 input.

LK10 A U17 input Change to B if U17 needs to be bypassed.

LK11 A U17 input Change to B if U17 needs to be bypassed.

LK12 A U16 input Change to B if U16 needs to be bypassed.

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