Analog Devices EVAL-AD7450A Manuale utente

Evaluation Board User Guide

EVAL-AD7450A/EVAL-AD7451

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 AD7450A and AD7451

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS.Rev. A | Page 1 of 28

FEATURES

Full-featured evaluation board for the AD7450A and AD7451

PC control in conjunction with the system demonstration

platform (EVAL-SDP-CB1Z)

PC software for control and data analysis (time and

frequency domain)

Standalone capability

EVALUATION KIT CONTENTS

EVAL-AD7450ASDZ/EVAL-AD7451SDZ evaluation board

Evaluation software CD for the AD7450A/AD7451

9 V mains power supply adapter

ADDITIONAL EQUIPMENT NEEDED

System demonstration platform (EVAL-SDP-CB1Z)

Precision analog signal source

SMB cables

USB cables

GENERAL DESCRIPTION

The E VA L -AD7450ASDZ/EVA L -AD7451SDZ is a full-featured

evaluation board designed to allow the user to easily evaluate all

features of the AD7450A and AD7451. The evaluation board

can be controlled via the system demonstration platform

(SDP) connector (J8). The E VA L -SDP-CB1Z board allows

the evaluation board to be controlled via the USB port of a

PC using the AD7450A/AD7451 evaluation software.

The E VA L -AD7450ASDZ/EVA L -AD7451SDZ generates all

required power supplies on board and supplies power to the

E VA L-SDP-CB1Z controller board. On-board components

include the following:

•AD8599: Ultralow distortion, ultralow noise op amp (dual)

•ADP1613: Step-up PWM dc-to-dc switching converter

•ADP3303-5: High accuracy anyCAP™ 200 mA low dropout

linear regulator

•ADP1720: 50 mA, high voltage, micropower linear regulator

•ADP7104: 20 V, 500 mA, low noise, CMOS LDO

•ADM1185: Quad voltage monitor and sequencer

•ADG3308: Low voltage, 1.15 V to 5.5 V, 8-channel

bidirectional logic level translator

•ADR431: Ultralow noise XFET® voltage reference with

current sink and source capability

Various link options are described in the Evaluation Board

Hardware section.

FUNCTIONAL BLOCK DIAGRAM

EVAL-SDP-CB1Z

CONTROLLER

BOARD

SERIAL

INTERFACE

ON-BOARD

POWER SUPPLIES

VAMP–

ADG3308

LEVEL

SHIFTER

VIN

INPUT

JACK

VAMP+

GND

SCLK

IN+

–

ADR431

REF

VDD

GND

EVAL-AD7450ASDZ/EVAL-AD7451SDZ

ADP7104

SDP5V

ADM1185

POWER

SEQUENCER

OP AMP

SUPPLIES

VIN

7V TO 9V

SDATA

GND

REF

AD8599

IN–

INPUT A

INPUT B

SET TO DIFF

CIRCUIT

BUFFERS EXT REF

UNIPOLAR/

BIPOLAR

SELECT

18MHz

SCLK

BF527

DSP

ADP1613

15V

ADP3303

+5V

ADP1720

3.3V

BIAS UP

CIRCUIT

AD7450A

AD7451

06231-001

Figure 1.

EVAL-AD7450A/EVAL-AD7451 Evaluation Board User Guide

Rev. A | Page 2 of 28

TABLE OF CONTENTS

Features .............................................................................................. 1

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

Additional Equipment Needed....................................................... 1

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

Functional Block Diagram .............................................................. 1

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

Getting Started .................................................................................. 3

Quick Start Steps .......................................................................... 3

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

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

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

AD7450A/AD7451 Device Description.................................... 8

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

Link Configuration Options ........................................................... 9

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

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

Reference Options...................................................................... 11

Sockets/Connectors ................................................................... 11

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

Serial Interface ............................................................................ 12

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

How to Use the Software for Evaluating the AD7450A/

AD7451............................................................................................ 13

Setting Up the System for Data Capture ................................. 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 Schematic and Artwork ............................. 20

REVISION HISTORY

4/13—Rev. 0 to Rev. A

Replaced EVAL-AD7440/AD7450A and EVAL-AD7441/AD7451

with EVAL-AD7450A/EVAL-AD7451 ............................Universal

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

Replaced All Sections, Tables, and Figures .....................Universal

3/07—EVAL-AD7440/AD7450A Revision 0: Initial Version

12/06—EVAL-AD7441/AD7451 Revision 0: Initial Version

Evaluation Board User Guide EVAL-AD7450A/EVAL-AD7451

Rev. A | Page 3 of 28

GETTING STARTED

QUICK START STEPS

To install the software do the following:

1. Install the AD7450A/AD7451 software from the

enclosed CD.

Ensure that the E VA L -SDP-CB1Z board is not connected

from the USB port of the PC while installing the software.

The PC must be restarted after the installation.

2. Connect the E VA L -SDP-CB1Z board to the E VA L -

AD7450ASDZ/EVA L -AD7451SDZ board as shown in

Figure 2. Screw the two boards together with the enclosed

nylon screw-nut set to ensure the boards connect firmly

together.

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

kit to connecter J702 on the EVAL-AD7450ASDZ/EVA L-

AD7451SDZ board.

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

USB cable. For 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.

5. Launch the E VA L -AD7450ASDZ/E VA L -AD7451SDZ

software from the Analog Devices subfolder in the

Programs menu.

USB TO PC

9V PSU

AD7450A

AD7451

EVAL-SDP-CB1Z

06231-002

Figure 2. Hardware Configuration—Setting Up the EVAL-AD7450ASDZ/EVAL-AD7451SDZ

EVAL-AD7450A/EVAL-AD7451 Evaluation Board User Guide

Rev. A | Page 4 of 28

SOFTWARE INSTALLATION PROCEDURES

The E VA L -AD7450ASDZ/EVA L -AD7451SDZ evaluation kit

includes software on a CD. Click the setup.exe file from the

CD to run the install. The default location for the software is

C:\Program Files\Analog Devices\AD7450A/AD7451.

There are two parts to the installation:

•AD7450A/AD7451 evaluation board software installation

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

drivers installation

Warning

The evaluation 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 connected to the PC.

Installing the AD7450A/AD7451 Evaluation Board

Software

To install the AD7450A/AD7451 evaluation board software,

1. With the E VA L-AD7450ASDZ/E VA L -AD7451SDZ

board disconnected from the USB port of the PC, insert

the installation CD into the CD-ROM drive.

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

board software installation. The software is installed to

the following default location: C:\Program Files\Analog

Devices\AD7450A/AD7451.

3. A dialog box appears asking for permission to allow the

program to make changes to your computer. Click Yes.

06231-003

Figure 3. AD7450A/AD7451 Evaluation Board Software Installation:

Granting Permission for Program to Make Changes

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

06231-004

Figure 4. AD7450A/AD7451 Evaluation Board Software Installation:

Selecting the Location for Software Installation

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

select I accept the License Agreement and click Next.

06231-005

Figure 5. AD7450A/AD7451 Evaluation Board Software Installation:

Accepting the License Agreement

Evaluation Board User Guide EVAL-AD7450A/EVAL-AD7451

Rev. A | Page 5 of 28

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

continue.

06231-006

Figure 6. AD7450A/AD7451 Evaluation Board Software Installation:

Reviewing a Summary of the Installation

7. A dialog box informs you when the installation is

complete. Click Next.

06231-007

Figure 7. AD7450A/AD7451 Evaluation Board Software Installation:

Indicating When the Installation Is Complete

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 EVA L -

SDP-CB1Z system demonstration platform board drivers.

1. With the E VA L-SDP-CB1Z board still disconnected from

the USB port of the PC, make sure that all other applications

are closed, and then click Next.

06231-008

Figure 8. EVAL-SDP-CB1Z Drivers Setup

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

06231-009

Figure 9. EVAL-SDP-CB1Z Drivers Setup:

Selecting the Location for Drivers Installation

EVAL-AD7450A/EVAL-AD7451 Evaluation Board User Guide

Rev. A | Page 6 of 28

3. Click Install to confirm that you would like to install the

drivers.

06231-010

Figure 10. EVAL-SDP-CB1Z Drivers Setup:

Granting Permission to Install Drivers

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

closes the installation wizard.

06231-011

Figure 11. EVAL-SDP-CB1Z Drivers Setup:

Completing the Drivers Setup Wizard

5. 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.

06231-012

Figure 12. EVAL-SDP-CB1Z Drivers Setup:

Restarting the Computer

Evaluation Board User Guide EVAL-AD7450A/EVAL-AD7451

Rev. A | Page 7 of 28

EVALUATION BOARD SETUP PROCEDURES

The AD7450A/AD7451 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 2 shows a photograph of the connections made

between the AD7450A/AD7451 daughter board and the E VA L -

SDP-CB1Z board.

After following the instructions in the Software Installation

Procedures section, set up the evaluation and SDP boards as

detailed in this section.

Warning

The evaluation 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 connected to the PC.

Configuring the Evaluation and SDP Boards

1. Connect the E VA L-AD7450ASDZ/E VA L -AD7451SDZ

board to Connector A or Connector B on the E VA L -SDP-

CB1Z board.

a. Screw the two boards together using the nylon screw-

nut set included in the evaluation board kit to ensure

that the boards are connected firmly together.

2. Connect the power supplies on the E VA L-AD7450ASDZ/

E VA L-AD7451SDZ board to the J702 connector on the

E VA L-AD7450ASDZ/E VA L -AD7451SDZ board. (Alterna-

tively, a bench power supply may be used to power the

E VA L-AD7450ASDZ/E VA L -AD7451SDZ via J700. See

Table 1 for more information about the connections and

options for the required power supplies.)

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

the USB cable enclosed in the E VA L-SDP-CB1Z kit. If

using Windows XP platform, 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.

EVAL-AD7450A/EVAL-AD7451 Evaluation Board User Guide

Rev. A | Page 8 of 28

EVALUATION BOARD HARDWARE

AD7450A/AD7451 DEVICE DESCRIPTION

The AD7450A/AD7451 are 12-bit high speed, low power,

successive approximation (SAR) analog-to-digital converters

with a fully differential/pseudo differential analog input. The

parts operate from a single 3 V or 5 V power supply and use

advanced design techniques to achieve very low power

dissipation at throughput rates up to 1 MSPS. The SAR

architecture ensures that there are no pipeline delays.

POWER SUPPLIES

Take care before applying power and signals to the evaluation

board to ensure that all link positions are as required by the

operating mode.

When using the EVA L -AD7450ASDZ/E VA L-AD7451SDZ in

conjunction with the E VA L -SDP-CB1Z board, connect the ac

transformer to Connector J702. VCC, VDD, VSS, and VDRIVE are

generated on board. Alternatively, a bench power supply may

be connected to J700 to supply 7 V to 9 V.

Table 1. External Power Supply Required

Power Supply Connector Voltage Range Purpose

VIN1J700 or J702 7 V to 9 V Supplies all on-board power supplies, which generate all required voltages to run the

evaluation board.

VDD J100 +12 V to +16.5 V Amplifier positive supply.

VSS J100 −12 V to −16.5 V Amplifier negative supply.

VCC J703 4.75 V to 5.25 V VDD digital supply.

1When VIN is supplied, all other power supplies are available on board. If this supply is not used, then all other supplies must be sourced from an external source.

Evaluation Board User Guide EVAL-AD7450A/EVAL-AD7451

Rev. A | Page 9 of 28

LINK CONFIGURATION OPTIONS

There are 12 link options that must be set for the required

operating setup before using the evaluation board. The

functions of these options are outlined in Table 2, which

shows the position in which all the links are set when the

evaluation board is packaged. Jumper and solder link (LKx)

options must be set correctly to select the appropriate operating

setup before using the evaluation board. The default link posi-

tions are shown in Table 3 and Table 4 and the functions of these

options are outlined in Table 2.

Table 2. Link Options

Link No. Function

LK1 INPUT A destination selection. This selects which buffer INPUT A is connected to.

Position A: INPUT A is connected to single-ended to differential buffer.

Position B: INPUT A is connected to single-ended buffer (U10-A).

Position C: INPUT A is connected to bias up circuit (U7-A/U7-B).

LK2 INPUT A input impedance selection.

Insert: INPUT A input impedance is 51 Ω.

LK3 INPUT B destination selection. This selects which buffer INPUT B is connected to.

Position A: INPUT B is connected to LK5 Position B.

Position B: INPUT B is connected to single-ended buffer (U10-B).

LK4 Input signal selection.

Insert when input signal at INPUT A is bipolar.

Remove when input signal at INPUT A is unipolar.

LK5 This selects the source for the positive terminal of U5-B.

Position A: ½ VREF is supplied to U5-B.

Position B: INPUT B is supplied to U5-B.

Position C: 0 V is supplied to U5-B.

LK6 VIN+ source selection. Select which buffered signal is routed to AD7450A/AD7451 Pin VIN+.

Position A: Signal is sourced from single-ended to differential buffer output (U5-A).

Position B: Signal is sourced from single-ended buffer (U10-A).

Position C: Signal is sourced from bias up circuit (U7-B).

LK7

VIN− source selection. Select which buffered signal is routed to AD7450A/AD7451 Pin V

IN−

Position A: Signal is sourced from single-ended to differential buffer output (U5-B).

Position B: Signal is sourced from single-ended buffer (U10-B).

LK8 INPUT B input impedance selection.

Insert: INPUT B input impedance is 51 Ω.

LK9 VREF source selection.

Position A: VREF is sourced from U2 (ADR431 an ultralow noise XFET® voltage reference).

Position B: VREF is sourced externally via SMB connector EXT_VREF.

LK1011Amplifier negative voltage supply selection.

Position A: Amplifier negative voltage supplied from on-board supply.

Position B: Amplifier negative voltage supplied from external source via J100 Terminal 1 labeled VSS.

LK1021Amplifier positive voltage selection.

Position A: Amplifier positive voltage supplied from on board supply.

Position B: Amplifier positive voltage supplied from external source via J100 Terminal 3 labeled VDD.

LK701 VDD supply for AD7450A/AD7451.

Position A: VDD supplied from on board supply (5 V).

Position B: VDD supplied from external source via J703 terminal labeled VCC.

1Both LK101 and LK102 should always be in corresponding positions.

EVAL-AD7450A/EVAL-AD7451 Evaluation Board User Guide

Rev. A | Page 10 of 28

Table 3. Link Options—Setup Conditions for AD7450A

Link No. Position Function

LK1 A INPUT A is connected to single-ended to differential converter (U5-A).

LK2 Inserted INPUT A input impedance is 51 Ω.

LK3 B INPUT B is connected to single-ended buffer (U10-B).

LK4 Inserted Input signal at INPUT A is bipolar.

LK5 C VREF/2 is supplied to U5-B.

LK6 A Signal is sourced from single-ended to differential converter (U5-A).

LK7 A Signal is sourced from single-ended to differential converter (U5-B).

LK8 Inserted INPUT B input impedance is 51 Ω.

LK9 B VREF is sourced from U2.

LK101

Amplifier negative voltage supplied from an on-board supply.

LK102 A Amplifier positive voltage supplied from an on-board supply.

LK701 A VDD supplied from on-board supply (5 V).

Table 4. Link Options—Setup Conditions for AD7451

Link No. Position Function

LK1 C INPUT A is connected to bias up circuit (U7).

LK2 Inserted INPUT A input impedance is 51 Ω.

LK3 B INPUT B is connected to single-ended buffer (U10-B).

LK4 Inserted Input signal at INPUT A is bipolar.

LK5 C VREF/2 is supplied to U5-B.

LK6 C Signal is sourced from bias up circuit (U7-B).

LK7 B Signal is sourced from input buffer (U10-B).

LK8 Inserted INPUT B input impedance is 51 Ω.

LK9

REF

is sourced from U2.

LK101 A Amplifier negative voltage supplied from an on-board supply.

LK102 A Amplifier positive voltage supplied from an on-board supply.

LK701 A VDD supplied from an on-board supply (5 V).

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